Flow micro-channel heat exchanger core body based on tiger pattern bionics and heat exchanger

Abstract

The invention belongs to the field of heat exchangers, and discloses a flow micro-channel heat exchanger based on tiger pattern bionics, which comprises a shell and a tiger pattern turbulent flow structure arranged in the shell. Through the design of the special-shaped herringbone structure of the cross section of the tiger pattern turbulent flow structure, the surface area of the formed micro-channel is larger than that of a linear channel, the heat exchange area of fluid and a solid wall surface is increased, the water flow resistance is effectively reduced, meanwhile, the flowing uniformity of the fluid is improved, and heat exchange is more stable and efficient. And through uniform and staggered distribution of the turbulent flow structures in different directions, a thermal boundary layer is effectively broken, and the local heat exchange capacity is enhanced. Compared with the prior art, the heat exchange area of the fluid and the solid wall surface is increased, the water flow resistance is reduced, the heat exchange performance of the heat exchanger is remarkably improved by repeatedly breaking the heat boundary layer, and the heat exchanger has high heat exchange efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of heat exchangers, and in particular relates to a flow micro-channel heat exchanger core based on tiger stripe bionics and a heat exchanger. Background Art

[0002] A micro-channel heat exchanger is a device that achieves heat exchange by setting up multiple micro-channels in a limited space. Due to the extremely small channel size, the channel width is usually between 0.1mm and 5mm. This type of heat exchanger can provide higher heat transfer efficiency and lower flow resistance, thereby significantly improving the overall heat exchange performance. Micro-channel heat exchangers are widely used in fields such as micro-devices, electronic devices, and chemical engineering that require efficient heat dissipation. In contrast, the rectangular channel structure is often used as a standard design due to its simpler geometry and manufacturing process. The rectangular channel heat exchanger has a relatively stable fluid flow pattern and is suitable for heat exchange between liquids and liquids or between gases and liquids.

[0003] However, the existing rectangular micro-channel heat exchangers still have shortcomings in some aspects. First, due to the poor uniformity of the flow distribution inside the rectangular channel, the local flow rate may be too large or too small, thereby reducing the heat exchange efficiency and causing overheating in certain areas. Secondly, the formation of the thermal boundary layer hinders the heat exchange between the fluid and the channel wall, further affecting the heat transfer efficiency. In addition, while improving the heat exchange efficiency, the increase in flow resistance also leads to an increase in system energy consumption, reducing the energy efficiency performance of the heat exchanger. Therefore, there is an urgent need to optimize the design of the existing rectangular channel micro heat exchanger, improve the uniformity of fluid flow, reduce the impact of the thermal boundary layer, and improve the overall performance of the heat exchanger and its efficiency in practical applications. Summary of the Invention

[0004] The present invention provides a flow micro-channel heat exchanger core and a heat exchanger based on tiger stripe bionics, which are used to solve the problems of uneven flow, low heat exchange efficiency and unsatisfactory energy efficiency of existing micro-channel heat exchangers.

[0005] The technical solution for achieving the purpose of the present invention is: a flow micro-channel heat exchanger core based on tiger stripe bionics, including a shell and a tiger stripe spoiler structure arranged inside the shell, and the working medium flows through the tiger stripe spoiler structure.

[0006] Furthermore, the tiger stripe spoiler structures are evenly arrayed in the direction of the working medium flow cross section to form a tiger stripe spoiler structure group, and the tiger stripe spoiler structure group is evenly arrayed along the working medium flow direction to periodically break the thermal boundary layer and enhance the local heat exchange capacity.

[0007] Furthermore, between two adjacent groups of tiger-striped flow disturbance structures, the opening directions of the tiger-striped flow disturbance structures are opposite, and they are staggered by half of the tiger-striped flow disturbance structure in the working fluid flow cross-section, which is used to effectively break the thermal boundary layer, enhance the local heat exchange capacity, and thus improve the overall heat transfer efficiency.

[0008] Furthermore, the tiger-striped flow disturbance structure is a rib-shaped solid structure. The tiger-striped flow disturbance structure is a special-shaped herringbone structure designed based on the surface pattern of a tiger's fur. The opening of the herringbone is an arc-shaped curve, and thus both the '丿' and '乀' of the special-shaped herringbone are circular arc curves.

[0009] Furthermore, a working fluid inlet and a working fluid outlet are respectively provided at both ends of the housing.

[0010] Furthermore, the ratio α of the width of the tiger-striped flow disturbance structure to the total width of the channel in the dimensionless parameter combination can be adjusted within the range of 0.5 to 1.5.

[0011] Furthermore, the ratio β of the fluid regeneration length to the width of the tiger-striped flow disturbance structure in the dimensionless parameter combination can be adjusted within the range of 3.3 to 16.25.

[0012] A heat exchanger has a micro-channel heat exchanger core based on tiger stripe bionics.

[0013] Compared with the prior art, the remarkable advantages of the present invention are:

[0014] (1) In the present invention, the cross-section of the flow disturbance structure is a special-shaped herringbone structure bionically designed based on the surface pattern of a tiger's skin. After the curve-shaped special-shaped herringbone structures are arranged in an orderly manner, the formed micro-channel structure has a larger surface area compared with a straight channel, increasing the heat exchange area between the fluid and the solid wall surface and improving the heat transfer efficiency. At the same time, the streamline structure of this special-shaped herringbone structure can effectively reduce the water flow resistance and improve the uniformity of fluid flow, making the heat exchange more stable and efficient.

[0015] (2) The uniform array of the tiger-striped flow disturbance structures of the present invention in the direction of the working fluid flow cross-section and the direction of the working fluid flow is used to periodically break the thermal boundary layer and enhance the local heat exchange capacity.

[0016] (3) In the present invention, the opening directions of adjacent groups of tiger-striped flow disturbance structures are opposite, and the staggered arrangement method of staggering by half in the working fluid flow cross-section increases the heat exchange area between the fluid and the solid wall surface, reduces the water flow resistance, and significantly improves the heat exchange capacity of the micro-channel by repeatedly interrupting the thermal boundary layer.

[0017] (4) Dimensionless structural parameters including the ratio (α) of the turbulence structure width (W1) to the total channel width (W2) and the ratio (β) of the fluid regeneration length (L1) to the width of the tiger stripe turbulence structure (W1) were proposed to eliminate the limitations of specific geometric dimensions and make it applicable to the design of heat exchangers of different scales. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall schematic diagram of the shell of the flow micro-channel heat exchanger based on tiger stripe bionics;

[0019] Figure 2 This is a top view of the cross section of the core of the flow micro-channel heat exchanger based on tiger stripe bionics;

[0020] Figure 3 A top view of the core of a flow micro-channel heat exchanger based on tiger stripe bionics;

[0021] Figure 4 This is a cross-sectional view of the tiger-stripe spoiler structure in the core of a flow micro-channel heat exchanger based on tiger-stripe bionics.

[0022] In the figure, 1-working fluid inlet, 2-shell, 3-tiger stripe spoiler structure, 4-working fluid outlet. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that those skilled in the art may make various modifications and improvements without departing from the scope of the present invention. These modifications and improvements are all within the scope of protection of the present invention.

[0024] The present invention relates to a flow micro-channel heat exchanger core based on tiger stripe bionics, comprising a shell 2 and a tiger stripe spoiler structure 3.

[0025] A working fluid inlet 1 and a working fluid outlet 4 are respectively provided on both sides of the shell 2, which are used for the flow in and out of the working fluid respectively. Multiple groups of tiger-stripe spoiler structures 3 are fixed on the upper and lower inner surfaces of the shell 2 and are perpendicular to the flow direction of the working fluid; during heat exchange, the working fluid enters from the working fluid inlet 1, flows through the tiger-stripe spoiler structure 3, and flows out from the working fluid outlet 4.

[0026] like Figure 3 As shown, the tiger stripe spoiler structures 3 are evenly arrayed in the working medium flow cross-sectional direction Y to form a tiger stripe spoiler structure group, and the tiger stripe spoiler structure group is evenly arranged along the working medium flow direction Y;

[0027] Between two adjacent groups of tiger-striped turbulator structures, the opening directions of the tiger-striped turbulator structures are opposite, and they are staggered by half of the tiger-striped turbulator structure 3 in the working fluid flow cross-section; this arrangement effectively breaks the thermal boundary layer and enhances the local heat exchange capacity, thereby improving the overall heat transfer efficiency.

[0028] The tiger-striped turbulator structure 3 is a rib-shaped solid structure, and its cross-section is a special-shaped herringbone structure designed based on the surface纹路 of tiger fur. The herringbone opening is an arc-shaped curve, and furthermore, both the "丿" and "乀" of the special-shaped herringbone are arc curves; after the arrangement of this curved special-shaped herringbone, the formed microchannel structure has a larger surface area than a straight channel, increasing the heat exchange area between the fluid and the solid wall surface and improving the heat transfer efficiency. At the same time, the streamlined structure of this special-shaped herringbone structure can effectively reduce the water flow resistance and improve the uniformity of fluid flow, making the heat exchange more stable and efficient.

[0029] The hydraulic diameters of the working fluid inlet 1 and the working fluid outlet 4 of the microchannel heat exchanger based on tiger-striped bionics can be adjusted;

[0030] The length, width, and height of the tiger-striped turbulator structure 3 of the microchannel heat exchanger based on tiger-striped bionics can be adjusted;

[0031] The number of the tiger-striped turbulator structures 3 of the microchannel heat exchanger based on tiger-striped bionics in the flow direction and perpendicular to the flow direction can be adjusted according to the dimensionless structure optimization parameters;

[0032] As an implementation manner of this embodiment, the ratio α of the dimensionless parameter turbulator structure width (W = 1) to the total channel width (W = 2) in the tiger-striped turbulator structure 3 can be adjusted between 0.5 and 1.5;

[0033] As an implementation manner of this embodiment, the ratio β of the dimensionless parameter fluid regrowth length (L = 1) to the tiger-striped turbulator structure width (W = 1) in the tiger-striped turbulator structure can be adjusted between 3.3 and 16.25;

[0034] As key dimensionless parameters, α and β can accurately quantify the action mechanism of the turbulator structure on the fluid flow and heat transfer characteristics. By optimizing their values, the balance between heat transfer efficiency and flow resistance can be achieved. When α and β exceed the design range, the system performance will be significantly affected: when the value of α is too small, the disturbance intensity of the turbulator structure on the fluid is insufficient, and it is difficult to effectively break the boundary layer, resulting in limited heat transfer enhancement effect; when the value of α is too large, the fluid flow resistance will be significantly increased, causing unnecessary energy consumption losses. When the value of β is too small, the fluid is difficult to fully recover its flow state between adjacent turbulator structures, easily leading to excessive attenuation of turbulence or accumulation of eddy currents, resulting in a sharp increase in flow resistance; when the value of β is too large, the disturbance kinetic energy of the fluid gradually dissipates during long-distance flow, the boundary layer thickens again, weakening the convective heat transfer effect and reducing the overall heat transfer efficiency. <00]I]]

[0035] In this embodiment, α = 1, β = 7.624. Compared with a straight uninterrupted flow channel, the wall temperature is reduced by 17.67%, the heat transfer coefficient is increased by 96.15%, and the pressure drop is increased by 76.67%.

[0036] The working principle of the tiger-striped bionic flow micro-channel heat exchanger disclosed in the present invention is as follows: the working fluid enters the thermal insulation shell 2 from the working fluid inlet 1, passes through the tiger-striped spoiler structure 3, and flows out through the working fluid outlet 4.

[0037] The present invention provides a novel flow micro-channel heat exchanger core and heat exchanger based on tiger stripe bionics. Through the design of the tiger stripe spoiler structure 3 and its staggered arrangement, the heat exchange area between the working fluid and the solid wall is increased, the water flow resistance is reduced, and by repeatedly interrupting the thermal boundary layer, the present invention significantly improves the heat exchange performance of the heat exchanger and has a higher heat exchange efficiency.

[0038] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can refer to fixed connection, detachable connection, or integration; "connection" can refer to mechanical connection or electrical connection. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

Claims

1. A flow micro-channel heat exchanger core based on tiger stripe bionics, characterized in that: It includes a housing and a tiger-striped flow disturbance structure arranged inside the housing, and the working fluid flows through the tiger-striped flow disturbance structure.

2. The tiger stripe bionic flow micro-channel heat exchanger core according to claim 1 is characterized in that: The tiger-striped flow disturbance structures are uniformly arrayed in the direction of the working fluid flow cross-section to form a group of tiger-striped flow disturbance structures, and the groups of tiger-striped flow disturbance structures are uniformly arrayed along the direction of the working fluid flow, which is used to periodically break the thermal boundary layer and enhance the local heat exchange capacity.

3. The tiger-striped bionic flow micro-channel heat exchanger core according to claim 2, characterized in that: Between two adjacent groups of tiger-striped flow disturbance structures, the opening directions of the tiger-striped flow disturbance structures are opposite, and they are offset by half of the tiger-striped flow disturbance structure on the working fluid flow cross-section; this is used to effectively break the thermal boundary layer, enhance the local heat exchange capacity, and thus improve the overall heat exchange efficiency.

4. The tiger-striped bionic flow micro-channel heat exchanger core according to claim 2, characterized in that: The tiger-striped flow disturbance structure is a rib-shaped solid structure. The tiger-striped flow disturbance structure is a special-shaped chevron structure designed based on the surface pattern of tiger fur. The chevron opening is an arc-shaped curve, and furthermore, both the "丿" and "乀" of the special-shaped chevron are arc curves.

5. The tiger-striped bionic flow micro-channel heat exchanger core according to claim 1, characterized in that: The two ends of the housing are respectively provided with a working fluid inlet and a working fluid outlet.

6. The tiger-striped bionic flow micro-channel heat exchanger core according to claim 4, characterized in that: The ratio α of the width of the tiger-striped flow disturbance structure to the total width of the channel in the dimensionless parameter combination is adjusted within the range of 0.5 - 1.

5.

7. The tiger-striped bionic flow micro-channel heat exchanger core according to claim 5, characterized in that: The ratio β of the fluid regeneration length to the width of the tiger-striped flow disturbance structure in the dimensionless parameter combination is adjusted within the range of 3.3 - 16.

25.

8. A heat exchanger having a micro-channel heat exchanger core based on tiger pattern bionics as described in any one of claims 1 - 7.

Images