Simulation calculation method and device for air gap heat transfer in heating smoking set and computer program product

Abstract

The invention discloses an air gap heat transfer simulation calculation method and device for the interior of a heating smoking set and a computer program product, the heating smoking set comprises a first element and a second element, and the first element and the second element are arranged in a sleeving mode and keep a spacing distance; the air gap heat transfer simulation calculation method comprises the following steps that 1, the spacing distance between a first element and a second element is obtained; 2, selecting an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element based on the spacing distance and the gap gas heat transfer characteristic information; and 3, according to the selected air gap heat transfer calculation formula, performing simulation calculation on gas heat transfer among the elements. According to the method, the corresponding air gap heat transfer calculation formula between the elements can be determined by obtaining the spacing distance between the elements in the heating smoking set and combining the gap gas heat transfer characteristic information, air gap heat transfer simulation calculation in the heating smoking set is simplified, and the simulation calculation efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heating smoking article simulation, and in particular relates to a method, a device and a computer program product for simulating and calculating air gap heat transfer inside a heating smoking article. Background Art

[0002] As the global tobacco control environment becomes increasingly severe and consumers pay more and more attention to health issues, heat-not-burn tobacco products are gradually favored by the market as a new type of tobacco product. Heat-not-burn tobacco products use electric energy to heat tobacco materials and provide a similar smoking experience to traditional cigarettes, but their heating efficiency and energy utilization are limited by the design level and simulation calculation efficiency. At present, the simulation efficiency of heat-not-burn tobacco products is slow, which is mainly reflected in high computational complexity, insufficient model optimization, algorithm and software limitations, and difficulties in data processing and analysis.

[0003] Since the gaps between the components inside the heating device are different, the same heat transfer formula is used for calculation, and the final simulation results have large deviations. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the same heat transfer formula is used for calculation due to different gaps between components inside the heating device, resulting in large deviations in the simulation results, the present invention provides a method, device and computer program product for simulating and calculating air gap heat transfer inside the heating device.

[0005] The technical solution adopted by the present invention is:

[0006] A method for simulating heat transfer of air gaps inside a heating smoking device, wherein the heating smoking device comprises a first element and a second element, wherein the first element and the second element are mutually nested and maintain a spacing distance, and wherein the method for simulating heat transfer of air gaps comprises the following steps:

[0007] Step 1: Obtaining the spacing distance between the first element and the second element;

[0008] Step 2: Based on the spacing distance and the heat transfer characteristic information of the gap gas, select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element;

[0009] Step 3: According to the selected air gap heat transfer calculation formula, simulate the gas heat transfer between the components.

[0010] Furthermore, the step 2 specifically includes:

[0011] Based on the gap gas heat transfer characteristic information, determining the relationship between the gap distance and the first preset threshold and the second preset threshold:

[0012] If the spacing distance is greater than a first preset threshold, executing step 2-1: determining that the heat transfer type between the first element and the second element is mainly convective heat transfer, and selecting the air gap heat transfer calculation formula as a gas comprehensive heat transfer formula;

[0013] If the spacing distance is less than the first preset threshold and greater than the second preset threshold, executing step 2-2: determining that the heat transfer type between the first element and the second element is mainly solid heat transfer, and selecting the air gap heat transfer calculation formula as the solid heat transfer formula;

[0014] If the spacing distance is less than the second preset threshold, perform step 2-3: determine that the heat transfer type between the first element and the second element is mainly contact thermal resistance, and select the air gap heat transfer calculation formula as the thermal contact heat transfer formula.

[0015] Furthermore, the first element and the second element are a shell and an insulation tube, or an insulation tube and a heating tube.

[0016] Furthermore, the gap gas heat transfer characteristic information includes the relationship between the spacing distance between the first element and the second element and the convective heat transfer rate.

[0017] Furthermore, the first preset threshold is 1-2 mm, and the second preset threshold is 0.1-1 mm.

[0018] Furthermore, the comprehensive heat transfer formula of gas is:

[0019]

[0020] Where q is the heat flux in W / m 2 ; k is the thermal conductivity of gas, unit is W / (m·K); is the temperature gradient, in K / m; h is the convective heat transfer coefficient, in W / (m 2 ·K); T s is the solid surface temperature, in K; T ∞ is the temperature of the fluid far away from the solid surface, in K; ∈ is the surface emissivity; σ is the Stefan-Boltzmann constant.

[0021] Furthermore, the solid heat transfer formula is:

[0022]

[0023] Where q is the heat flux in W / m 2 ;k eff It is the thermal conductivity of gas when it is equivalent to solid conduction, the unit is W / (m·K); is the temperature gradient in K / m.

[0024] Furthermore, the thermal contact heat transfer formula is:

[0025]

[0026] Where q is the heat flux in W / m 2 ; T1, T2 are the temperatures of the two walls, in K; R c is the contact thermal resistance, unit is (K·m 2 ) / W.

[0027] A device for simulating and calculating air gap heat transfer inside a heating smoking device, the heating smoking device comprising a first element and a second element, the first element and the second element being mutually nested and maintaining a spacing distance, characterized in that the device for simulating and calculating air gap heat transfer comprises:

[0028] An acquisition module, used for acquiring a spacing distance between the first element and the second element;

[0029] A simplified module, configured to select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element based on the spacing distance and the heat transfer characteristic information of the gap gas;

[0030] The calculation module is used to simulate the gas heat transfer between the components according to the selected air gap heat transfer calculation formula.

[0031] A computer program product comprises a computer program and / or a computer instruction, wherein when the computer program and / or the computer instruction is executed by a processor, the steps of any one of the above-mentioned air gap heat transfer simulation calculation methods are implemented.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The present invention obtains the spacing distance between the components inside the heating smoking device and combines the gap gas heat transfer characteristic information to determine the corresponding air gap heat transfer calculation formula between the components, simplifies the air gap heat transfer simulation calculation inside the heating smoking device, and improves the efficiency of the simulation calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flow chart of the air gap heat transfer simulation calculation method of the present application;

[0035] Figure 2 is a graph of the relationship between air temperature and thermal conductivity of the present application;

[0036] Figure 3 is a graph of the relationship between air pressure and thermal conductivity of the present application;

[0037] Figure 4 is a graph showing the relationship between the spacing size between the elements of the present application and the convective heat transfer rate;

[0038] Figure 5 It is the temperature cloud diagram of the heating element of the present application;

[0039] Figure 6 is a temperature cloud diagram of the vacuum insulation pipe of the present application;

[0040] Figure 7 is a temperature cloud map of the bracket of the present application;

[0041] Figure 8 is a temperature cloud diagram of the housing of the present application;

[0042] Fig. 9 It is a temperature cloud diagram of the heating device as a whole of the present application;

[0043] Fig.10 It is a structural block diagram of the air gap heat transfer simulation calculation device of the present application.

[0044] The reference numerals are described as follows:

[0045] Air gap heat transfer simulation calculation device 100;

[0046] Acquisition module 110;

[0047] Simplified module 120;

[0048] Calculation module 130. DETAILED DESCRIPTION

[0049] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0052] The heating smoking device in the present invention is a circumferential heating device.

[0053] It can be understood that the circumferential heating device has the following heat transfer characteristics:

[0054] 1. The wall structure of the circumferentially heated smoke device is simple, and the heat transfer coefficient is between 7 and 15 W / m2·K, but it takes a lot of computing power to calculate the comprehensive heat transfer.

[0055] 2. There are a large number of component surfaces in contact inside the circumferentially heated smoking device, and the contact thermal resistance between different components needs to be set manually, lacking theoretical guidance.

[0056] 3. There are a lot of narrow spaces (<2mm) inside the circumferentially heated smoking device, and the gas is mainly heat-conducted, but the fluid domain is difficult to generate and the calculation is large.

[0057] Example 1

[0058] refer to Figure 1 The present invention provides a method for simulating heat transfer of air gaps inside a heating smoking device. The heating smoking device includes a first element and a second element. The first element and the second element are mutually nested and maintain a spacing distance. The method for simulating heat transfer of air gaps includes the following steps:

[0059] Step 1: Obtaining the spacing distance between the first element and the second element;

[0060] Step 2: Based on the spacing distance and the heat transfer characteristic information of the gap gas, select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element;

[0061] Step 3: According to the selected air gap heat transfer calculation formula, simulate the gas heat transfer between the components.

[0062] The air gap heat transfer simulation calculation method provided by the present invention combines the gap gas heat transfer characteristic information and determines the corresponding air gap heat transfer calculation formula between the components according to the spacing distance between the components inside the heating smoking device, thereby simplifying the air gap heat transfer simulation calculation inside the heating smoking device, especially for the situation where there are a large number of narrow spaces such as circumferential heating smoking devices, and can effectively improve the simulation calculation efficiency of such smoking devices.

[0063] Specifically, the step 2 specifically includes:

[0064] Based on the gap gas heat transfer characteristic information, determining the relationship between the gap distance and the first preset threshold and the second preset threshold:

[0065] If the spacing distance is greater than a first preset threshold, executing step 2-1: determining that the heat transfer type between the first element and the second element is mainly convective heat transfer, and selecting the air gap heat transfer calculation formula as a gas comprehensive heat transfer formula;

[0066] If the spacing distance is less than the first preset threshold and greater than the second preset threshold, executing step 2-2: determining that the heat transfer type between the first element and the second element is mainly solid heat transfer, and selecting the air gap heat transfer calculation formula as the solid heat transfer formula;

[0067] If the spacing distance is less than the second preset threshold, perform step 2-3: determine that the heat transfer type between the first element and the second element is mainly contact thermal resistance, and select the air gap heat transfer calculation formula as the thermal contact heat transfer formula.

[0068] It can be understood that the present invention determines the relationship between the spacing distance between elements and the threshold value, selects the corresponding heat transfer calculation method for calculation, simplifies the complexity of the air gap heat transfer calculation and improves the efficiency of subsequent simulation calculations.

[0069] The information on the heat transfer characteristics of interstitial gas mainly refers to the relevant information generated when heat is transferred through the gas in the tiny gaps between the components inside the heating device during the heating process of the heating device.

[0070] Specifically, the first element and the second element are a shell and an insulation tube, or an insulation tube and a heating tube.

[0071] Specifically, the gap gas heat transfer characteristic information includes the relationship between the spacing distance between the first element and the second element and the convection heat transfer rate.

[0072] Specifically, the first preset threshold is 1-2 mm, and the second preset threshold is 0.1-1 mm.

[0073] For example, please refer to Figure 2 When the temperature inside the heating device gradually increases, the air pressure also increases continuously, and the air temperature and thermal conductivity have a strong linear correlation. Figure 3 As shown in Figure 2, as the air pressure increases, the thermal conductivity gradually tends to a stable value.

[0074] Specifically, the comprehensive heat transfer formula of gas is:

[0075]

[0076] Where q is the heat flux in W / m 2 ; k is the thermal conductivity of gas, unit is W / (m·K); is the temperature gradient, in K / m; h is the convective heat transfer coefficient, in W / (m 2 ·K); T s is the solid surface temperature, in K; T ∞ is the temperature of the fluid far away from the solid surface, in K; ∈ is the surface emissivity; σ is the Stefan-Boltzmann constant.

[0077] It should be noted that the comprehensive heat transfer formula for gases combines three basic heat transfer methods: heat conduction, convection and radiation.

[0078] Specifically, the solid heat transfer formula is:

[0079]

[0080] Where q is the heat flux in W / m 2 ;k eff It is the thermal conductivity of gas when it is equivalent to solid conduction, the unit is W / (m·K); is the temperature gradient in K / m.

[0081] Specifically, the thermal contact heat transfer formula is:

[0082]

[0083] Where q is the heat flux in W / m 2 ; T1, T2 are the temperatures of the two walls, in K; R c is the contact thermal resistance, unit is (K·m 2 ) / W.

[0084] The heating smoking article of the present invention may be a circumferential heating smoking article, which is a heat-not-burn smoking article that adopts a circumferential heating method, and its characteristics are mainly reflected in the heating method and structural design.

[0085] It can be understood that, unlike the central heating method, circumferential heating means that the heating element heats the cigarette around the periphery, so that the cigarette is evenly heated from the outside to the inside. This heating method can ensure uniform carbonization of the cigarette and provide better taste and comfort.

[0086] That is, the internal pressure of the heating device has no effect on the heat conduction of the air, while the thermal conductivity of the air in the high-temperature section inside the heating device varies greatly.

[0087] Please refer to Figure 4 , the spacing between the internal components of the heating device at different temperatures, the corresponding rising curve of the convective heat transfer rate relationship is also different. That is, it can be determined that 1. When the spacing between the components is above 1mm, the convective heat transfer between the components increases significantly; 2. When the spacing between the components is between 0.1 and 1mm, the convective heat transfer between the components is extremely low. 3. When the spacing between the components is below 0.1mm, the heat transfer between the components is a non-fluid heat transfer characteristic.

[0088] In the embodiment of the present application, the first preset threshold value can be set to 1 mm, and the second preset threshold value is 0.1 mm.

[0089] It should be noted that the air gap heat transfer simulation calculation method provided in the present application can also be combined with a gridless fast simulation method to further improve the efficiency of the simulation calculation.

[0090] Exemplarily, the main components of the heating tobacco device (for example: heating element, vacuum insulation tube, bracket, battery core, shell, etc.) are analyzed. Considering that the battery core has extremely weak influence on the overall heat transfer performance of the circumferential heating device, the heating element of the device is heated to 250°C, the shell temperature is usually 40-55°C, and the battery core temperature is usually kept in the low temperature range (20-30°C). Therefore, the heat transfer simulation of the battery core components can be ignored, and it is determined that the heating element is the heating core component one, the vacuum insulation tube is the heating core component two, the bracket is the heating core component three, and the shell is the heating core component four.

[0091] It should be noted that the gridless simulation software used in the embodiment of the present application is ANSYS Discovery, and its minimum simulation environment requirements are as follows: 64-bit Intel or AMD system, running Windows 10, 8GB of memory, a dedicated graphics card with the latest driver and at least 1GB of video memory, and capable of supporting OpenGL4.5 and DirectX 11 or higher.

[0092] It can be understood that by using the meshless fast simulation method to perform heat transfer simulation calculations, the two original steps in the traditional simulation process (creating or modifying the geometric model, defining the structural load and boundary conditions) can be combined into one step, that is, simplifying or modifying the model while defining the model's operating environment; then the operation of meshing the model in the traditional simulation process is omitted. The quality of meshing directly affects the reliability of the simulation results. Professional simulation engineers are required to analyze the model and set the corresponding mesh type and mesh unit size. The meshless simulation technology does not require manual operation. The background automatically meshes according to the model. You only need to select the fidelity size (that is, the accuracy of the meshing); then you can click the solve button to perform calculations, which simplifies a series of highly professional manual operations in the traditional simulation process, such as selecting the heat transfer solution model, setting the solver parameters, setting the flow field initialization, and setting the number of iterations; the temperature cloud map of the model is presented in less than 1 minute.

[0093] If the core heating component is a heating element: determine the inner diameter, thickness and material of the heating element; based on the inner diameter, thickness and material of the heating element, perform temperature simulation calculation on the heating element to obtain a temperature cloud diagram of the heating element.

[0094] For example, the design structure and heat transfer characteristics of the heating core component (heating element) can be combined to perform gridless simulation. According to the imported heating core component model, the heating element is a cylinder with an inner diameter of 3mm and a thickness of 0.2mm, and a vacuum insulation tube is spaced a certain distance outside; as a small electric heating device, the gap between the heating element and the vacuum insulation tube has a great influence on the overall heat transfer performance. Combined with the study of narrow spaces, the gap between the heating element and the vacuum insulation tube is greater than 1mm. The simulation is based on fluid heat transfer, and the heat transfer coefficient is 12W / (m2 ·℃); Material properties: The heating element is made of stainless steel 304, and the vacuum insulation tube is made of aluminum; Boundary conditions: The heating element is set to solid heat transfer, the temperature is 250℃, the environment is set to air fluid, convection heat transfer, the temperature is 25℃, and the heat transfer coefficient is 12W / (m 2 ℃). Then select a suitable fidelity and press the solve button. Wait for less than 30 seconds to obtain the temperature cloud map of the heating element. Figure 5 shown.

[0095] If the core heating component is a vacuum insulated tube: determine the vacuum degree, thickness and material of the vacuum insulated tube; based on the vacuum degree, thickness and material of the vacuum insulated tube, perform temperature simulation calculation on the vacuum insulated tube to obtain a temperature cloud map of the vacuum insulated tube.

[0096] For example, the gridless simulation is applied to the core heating component II (vacuum insulation tube) in combination with its design structure and heat transfer characteristics. According to the imported core heating component II model, the vacuum insulation tube is a certain distance away from the heating element. The vacuum insulation tube is a double-layer stainless steel cylinder with an internal vacuum degree of 0.5Pa and a thickness of 0.05mm. As a small electric heating device, the gap between the heating element and the vacuum insulation tube has a great influence on the overall heat transfer performance. Combined with the study of narrow spaces, the gap between the heating element and the vacuum insulation tube is greater than 1mm. The simulation is based on fluid heat transfer, and the heat transfer coefficient is 12W / (m 2 ·℃); Material properties: Aluminum is selected for the heating element, and stainless steel 304 is selected for the vacuum insulation tube; Boundary conditions: The heating element is set to solid heat transfer, temperature 250℃, the environment is set to air fluid, convection heat transfer, temperature 25℃, and the heat transfer coefficient is 12W / (m 2 ℃). Then select a moderate fidelity and press the solve button. Wait for less than 30 seconds to obtain the temperature cloud map of the vacuum insulation pipe, such as Figure 6 shown.

[0097] If the core heating component is a bracket: determine the thermal conductivity and material of the bracket; based on the thermal conductivity and material of the bracket, perform temperature simulation calculation on the vacuum insulation pipe to obtain a temperature cloud map of the vacuum insulation pipe.

[0098] Exemplarily, a gridless simulation application is performed on the third core heating component (bracket) in combination with its design structure and heat transfer characteristics. According to the imported core heating component model 3, the bracket mainly supports the battery core and the heating components (heating components include heating elements, vacuum insulation tubes, heating elements, outer shells, and insulation material layers), and blocks the heat transfer of the heating components as much as possible. Therefore, the bracket adopts polyetheretherketone (PEEK) material with low thermal conductivity and high heat resistance; considering the influence of the contact area during the heat conduction process of the bracket, the heat transfer contact is reduced as much as possible. Therefore, the contact between the bracket and the heating component, and the bracket and the connector are designed to be point contacts. Combined with the simplified calculation of the contact thermal resistance, the contact thermal resistance value can be obtained by calculation. In the simulation operation, the thermal conductivity of the point contact between the corresponding component and the bracket is specified (thermal conductivity is the thermal conductivity of the point contact between the bracket and the bracket). The inverse of thermal resistance); at the same time, as a small electric heating product, the existence of internal gaps has a great influence on the overall heat transfer performance. Combined with the study of narrow space, the gap between the bracket and the heating element is less than 0.1mm. At this time, the nature of non-fluid heat transfer can be simplified to contact thermal resistance. In the simulation operation, the thermal conductivity of the contact between the bracket and the outer shell of the heating component is specified (thermal conductivity is the inverse of thermal resistance); material properties: the bracket is made of PEEK material, and the heating component is made of stainless steel 304; boundary conditions: the heating component is set to solid heat transfer, the temperature is 100℃, the environment is set to air fluid, convection heat transfer, the temperature is 25℃, and the thermal conductivity of the contact between the heating component and the bracket is set to 2e3 W / (m 2 ·℃), the thermal conductivity of the contact point is set to 2e3 W / (m 2 ℃). Then select a moderate fidelity and press the solve button. Wait for less than 30 seconds to obtain the temperature cloud map of the bracket, such as Figure 7 shown.

[0099] If the heat-generating core component is a shell: determine the material, thermal conductivity and specific heat capacity of the shell; Step C8: perform temperature simulation calculation on the shell based on the material, thermal conductivity and specific heat capacity of the shell to obtain a temperature cloud map of the shell.

[0100] For example, the design structure and heat transfer characteristics of the core heating component four (housing) are combined to perform gridless simulation. According to the imported core heating component four model, the housing is the main component that contacts the human body, and uniform heat and suitable temperature are important design goals of the housing. Therefore, polyetheretherketone (PEEK) material with low thermal conductivity and high heat resistance is used; there is a certain gap between the housing and the internal components. The existence of the internal gap of the small electric heating device has a great influence on the overall heat transfer performance. Combined with the study of small spaces, the gap between the housing and the internal components is in the range of 0.1-1mm, and the convective heat transfer is extremely low, which can be simplified into solid heat transfer. Therefore, in the simulation operation, the heat transfer between the shell and the internal components is simplified to solid heat transfer, with a thermal conductivity of 2W / (m·K) and a specific heat of 1.8kj / (kg·℃); the natural cooling process between the shell and the external environment is a complex heat transfer process, in which the comprehensive heat transfer coefficient is an important parameter for the natural cooling of the shell, which is mainly affected by natural convection and radiation heat transfer. Since the actual shell temperature of the circumferential heating device is not high and the use environment is mild, the range of the comprehensive heat transfer coefficient is narrow, and the accuracy of the simplified comprehensive heat transfer calculation fully meets the requirements of heat transfer simulation design. According to the simplified equation of the comprehensive heat transfer coefficient, the ambient temperature T0 is taken between 20 and 25℃, and the wall temperature Tw is taken between 30 and 40℃. The calculated comprehensive heat transfer coefficient α_T is 9 to 11W / (m 2 ·℃). Therefore, in the simulation operation, the shell heat transfer is simplified to the comprehensive heat transfer coefficient of the shell of the device at an ambient temperature of 25℃ is 10W / (m 2 ·℃); Material properties: PEEK material is selected for the shell, and PEEK material is selected for the internal parts; Boundary conditions: The internal parts are set to solid heat transfer, the temperature is 85℃, the heat transfer between the shell and the internal parts is set to solid heat transfer, the thermal conductivity is 2W / (m·K), the specific heat is 1.8kj / (kg·℃), the environment is set to air, convection heat transfer, the temperature is 25℃, and the thermal conductivity of the shell is 10W / (m 2 ℃). Then select a moderate fidelity and press the solve button. Wait for less than 30 seconds to get the temperature cloud map of the shell, such as Figure 8 shown.

[0101] Through the above steps, the meshless simulation application of the circumferential heating device can quickly obtain the overall heat transfer result of the device, that is, the overall temperature cloud map of the heating smoking device, such as Fig. 9 The local temperature value of the device can also be obtained, among which the maximum temperature of the device wall is 50.7℃.

[0102] It can be understood that the air gap heat transfer simulation calculation method combined with the meshless fast simulation method can flexibly adapt to any changes in the simulation input, such as: processing the geometric structure or reselecting the material or further modifying the simulation boundary condition input, etc. Click to solve. In the process of solving, the simulation results are quickly obtained according to the heat transfer formula used for heat transfer between the components. In this case, the fidelity (i.e. the accuracy of the calculation results) is further adjusted. After waiting for about 30 seconds, the adjusted simulation results are immediately displayed on the screen in the form of a temperature cloud map. The entire process of meshless simulation runs completely automatically without excessive operation.

[0103] Example 2

[0104] refer to Figure 5 The present invention provides a heat transfer simulation calculation device for air gaps inside a heating smoking device. The heating smoking device comprises a first element and a second element. The first element and the second element are mutually nested and maintain a spacing distance. The heat transfer simulation calculation device 100 comprises:

[0105] An acquisition module 110, configured to acquire a spacing distance between the first element and the second element;

[0106] A simplification module 120, configured to select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element based on the spacing distance and the heat transfer characteristic information of the gap gas;

[0107] The calculation module 130 is used to simulate and calculate the gas heat transfer between the components according to the selected air gap heat transfer calculation formula.

[0108] Specifically, the simplified module 120 is also used to determine the relationship between the spacing distance and the first preset threshold and the second preset threshold based on the gap gas heat transfer characteristic information: if the spacing distance is greater than the first preset threshold, it is determined that the heat transfer type between the first element and the second element is mainly convective heat transfer, and the air gap heat transfer calculation formula is selected as the convection type comprehensive heat transfer formula; if the spacing distance is less than the first preset threshold and greater than the second preset threshold, it is determined that the heat transfer type between the first element and the second element is mainly solid heat transfer, and the air gap heat transfer calculation formula is selected as the solid heat transfer formula; if the spacing distance is less than the second preset threshold, it is determined that the heat transfer type between the first element and the second element is mainly contact thermal resistance, and the air gap heat transfer calculation formula is selected as the thermal contact heat transfer formula.

[0109] Example 3

[0110] The present application also provides an electronic device, comprising: a processor; a memory for storing processor executable instructions; wherein the processor implements the above-mentioned air gap heat transfer simulation calculation method for heating the inside of a smoking device by running the executable instructions.

[0111] Example 4

[0112] The present application also provides a computer-readable storage medium on which a computer program and / or computer instructions are stored. When the computer program / instructions are executed by a processor, the above-mentioned air gap heat transfer simulation calculation method for heating the interior of a smoking device is implemented.

[0113] Example 5

[0114] The present application also provides a computer program product, including a computer program and / or computer instructions, which, when executed by a processor, implement the steps of the above-mentioned air gap heat transfer simulation calculation method for heating the interior of a smoking article.

[0115] It should be noted that the systems, devices or modules described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, and the specific form of the computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email transceiver, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0116] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0117] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0118] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0119] The terms and expressions used herein are for descriptive purposes only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0120] Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. A method for simulating and calculating air gap heat transfer inside a heating smoking device, wherein the heating smoking device comprises a first element and a second element, wherein the first element and the second element are mutually nested and maintain a spacing distance, wherein: The air gap heat transfer simulation calculation method comprises the following steps: Step 1: Obtaining the spacing distance between the first element and the second element; Step 2: Based on the spacing distance and the heat transfer characteristic information of the gap gas, select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element; Step 3: According to the selected air gap heat transfer calculation formula, simulate the gas heat transfer between the components.

2. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 1, characterized in that: The step 2 specifically includes: Based on the gap gas heat transfer characteristic information, determining the relationship between the gap distance and the first preset threshold and the second preset threshold: If the spacing distance is greater than a first preset threshold, executing step 2-1: determining that the heat transfer type between the first element and the second element is mainly convective heat transfer, and selecting the air gap heat transfer calculation formula as a gas comprehensive heat transfer formula; If the spacing distance is less than the first preset threshold and greater than the second preset threshold, executing step 2-2: determining that the heat transfer type between the first element and the second element is mainly solid heat transfer, and selecting the air gap heat transfer calculation formula as the solid heat transfer formula; If the spacing distance is less than the second preset threshold, perform step 2-3: determine that the heat transfer type between the first element and the second element is mainly contact thermal resistance, and select the air gap heat transfer calculation formula as the thermal contact heat transfer formula.

3. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 1, characterized in that: The first element and the second element are a shell and a heat-insulating tube, or a heat-insulating tube and a heating tube.

4. The method for simulating and calculating air gap heat transfer for heating the interior of a smoking device according to claim 1, characterized in that: The gap gas heat transfer characteristic information includes the relationship between the spacing distance between the first element and the second element and the convection heat transfer rate.

5. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 2, characterized in that: The first preset threshold is 1-2 mm, and the second preset threshold is 0.1-1 mm.

6. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 2, characterized in that: The comprehensive heat transfer formula of gas is: Where q is the heat flux in W / m 2 ; k is the thermal conductivity of gas, unit is W / (m·K); is the temperature gradient, in K / m; h is the convective heat transfer coefficient, in W / (m 2 ·K); T s is the solid surface temperature, in K; T ∞ is the temperature of the fluid far away from the solid surface, in K; ∈ is the surface emissivity; σ is the Stefan-Boltzmann constant.

7. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 2, characterized in that: The solid heat transfer formula is: Where q is the heat flux in W / m 2 ;k eff It is the thermal conductivity of gas when it is equivalent to solid conduction, the unit is W / (m·K); is the temperature gradient in K / m.

8. The air gap heat transfer simulation calculation method for heating the interior of a smoking device according to claim 2, characterized in that: The thermal contact heat transfer formula is: Where q is the heat flux in W / m 2 ; T1, T2 are the temperatures of the two walls, in K; R c is the contact thermal resistance, unit is (K·m 2 ) / W.

9. A device for simulating and calculating air gap heat transfer inside a heating smoking device, the heating smoking device comprising a first element and a second element, the first element and the second element being mutually nested and maintaining a spacing distance, characterized in that: The air gap heat transfer simulation calculation device comprises: An acquisition module, used for acquiring a spacing distance between the first element and the second element; A simplified module, configured to select an air gap heat transfer calculation formula corresponding to the air gap between the first element and the second element based on the spacing distance and the heat transfer characteristic information of the gap gas; The calculation module is used to simulate the gas heat transfer between the components according to the selected air gap heat transfer calculation formula.

10. A computer program product, characterized in that The method comprises a computer program and / or a computer instruction, which, when executed by a processor, implements the steps of the air gap heat transfer simulation calculation method according to any one of claims 1 to 8.

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