31 results about "Flow boiling" patented technology

The invention discloses a micro-channel flow boiling enhanced heat transfer device based on a bionic structure. The device comprises a micro-channel structure base body, a channel inner surface wettability regulation and control layer, a working medium inlet and a working medium outlet. A bionic structure microchannel is arranged in the microchannel structure base body, the inner wall of the microchannel structure base body is provided with a micron-scale or nanometer-scale texture structure, the bionic structure microchannel is composed of a main channel and branch channels of at least three levels of fractal hierarchical structures, the width ratio of the branch channels is 1: 0.2-0.5, and the length range of the branch channels is 2-10 mm. And the contact angle gradient of the wettability regulation and control layer on the inner surface of the channel is 5-120 degrees. The tail end of each branch channel is provided with a bubble capturing groove with the diameter of 5-10 mm and the depth of 5 mm. The device can improve the boiling heat transfer coefficient, reduce the flow resistance and improve the bubble generation and desorption process, and is suitable for the fields of heat dissipation of high-heat-flux electronic equipment, aerospace heat management, chemical reaction and the like.

A multi-fidelity topological optimization method, system, device and medium for a microchannel flow boiling process, and the method comprises the steps: firstly carrying out low-fidelity topological optimization on a single-phase laminar flow convective heat transfer process to generate a group of candidate topological optimization structures; then calculating the speed, temperature and two-phase distribution in a single-phase heat transfer process and a flow boiling heat transfer process on the basis of a high-fidelity flow boiling numerical model, and constructing a novel objective function capable of reflecting flow boiling heat transfer characteristics on the basis of leading factors of the flow boiling heat transfer problem in the microchannel; and finally, directly generating a topological optimization structure under a low-fidelity condition based on the new objective function. Aiming at the defect that an existing topological optimization algorithm cannot directly optimize the flow boiling heat transfer problem, rapid and accurate multi-fidelity topological optimization is realized by constructing a novel objective function capable of reflecting the flow boiling heat transfer characteristics; according to the designed topological optimization structure, local hot spots are eliminated, thermal resistance is reduced, and temperature uniformity is improved.

The invention discloses a flow boiling radiator fin structure and a design method thereof.The flow boiling radiator fin structure comprises a heat dissipation shell and profiling dune sets, the heat dissipation shell is provided with an inlet and an outlet, and the multiple profiling dune sets are fixed in the heat dissipation shell and arranged between the inlet and the outlet in parallel at equal intervals; each profiling sand dune group is formed by arranging a plurality of crescent-imitated sand dune fins at equal intervals, the arrangement direction of the crescent-imitated sand dune fins is perpendicular to the flowing direction from the inlet to the outlet, the protruding end of each crescent-imitated sand dune fin faces the inlet, and the concave end of each crescent-imitated sand dune fin faces the outlet; according to the structure, the flow boiling heat exchange efficiency can be improved, meanwhile, steam bubbles can be effectively guided to be separated from a path, the flow resistance is reduced, the performance adjusting requirements under different heat load and flow conditions are met, the more efficient and more reliable two-phase cooling system structure configuration can be easily achieved, and the heat dissipation requirement of high-heat-flux application is met.

The present invention relates to the technical field of multiphase flow microchannel heat sinks, in particular to a lattice Boltzmann numerical simulation method for spontaneous nucleation of three-phase flow droplet boiling. It can be used for the numerical simulation of spontaneous nucleation boiling of three-phase flow droplets in a microchannel heat sink to obtain the precise three-phase distribution and the evolution process of bubble motion in the microchannel heat sink. The method described in this application combines an improved phase change model and a mechanism of spontaneous nucleation, and can effectively simulate the three-phase flow boiling process under a large density ratio, overcoming the numerical instability of traditional models under complex conditions; at the same time, by introducing new source terms and control equations, it can accurately capture the interaction between three-phase fluids and the bubble dynamics behavior.

The utility model relates to the technical field of fluidized bed reactors, in particular to an anti-overtemperature and anti-corrosion cold oil tank structure in an up-flow fluidized bed reactor, which is mounted between a raw material distributor and a support grid in a reactor shell, and a raw material distribution plate is fixed at the top of the raw material distributor. A plurality of first nozzles are fixed to the top of the raw material distribution disc, each first nozzle communicates with the raw material distributor, the cold oil tank structure comprises a bottom ring, a horn-shaped annular supporting wall fixed to the top of the bottom ring and a cold oil annular pipe fixed to the top of the annular supporting wall, and a plurality of second nozzles are fixed to the top of the cold oil annular pipe; each second spray head is communicated with a cold oil ring pipe, and the cold oil ring pipe is connected with a feeding pipe for conveying reaction passivation oil. According to the cold oil tank structure, reaction passivation oil and high-temperature raw materials are mixed, the temperature of the raw materials is reduced, the raw materials are diluted, and the effect of reducing the initial reaction temperature of a subsequent bed layer or reducing the temperature rise of the subsequent bed layer is achieved.

The invention discloses a method and device for acquiring the vapor content of a flowing boiling vapor-liquid two-phase flow and a medium, and the method comprises the steps: acquiring a bubble image which is a flowing boiling bubble image; converting the bubble image into a grey-scale map and carrying out binarization processing to obtain a binary image containing flow information; based on the binary image containing the flow information, extracting image features by adopting wavelet transform or a grey level histogram; a multi-layer deep BP neural network is constructed, the multi-layer deep BP neural network is trained based on the extracted image features, and a vapor-liquid two-phase flow pattern recognition model based on the BP neural network is obtained; a vapor-liquid two-phase flow pattern recognition model based on a BP neural network is adopted to carry out flow pattern recognition on the to-be-recognized bubble image, and a flow pattern recognition result is obtained; and according to different flow pattern recognition results, corresponding steam-containing rate calculation is carried out respectively, and the steam-containing rate value of the two-phase flow is obtained. The calculation accuracy is high, and the experimental data processing efficiency is effectively improved.

The invention provides a flow boiling two-way circulating flow enhanced heat exchange device for particles. The flow boiling two-way circulating flow enhanced heat exchange device comprises a boiling heating device, a positive and negative circulating system, a visual experiment section and a monitoring system. The boiling heating device is used for heating the working medium in the visual experiment section to a boiling state; particles are arranged in the visual experiment section, and a filtering device for preventing the particles from escaping is arranged at an inlet and an outlet of the visual experiment section; an observation device is arranged outside the visual experiment section and is used for observing a vapor-liquid-particle three-phase flow behavior in a boiling process in the experiment section; the positive and negative circulation system is communicated with the visual experiment section, so that the working medium drives the particles to directionally flow in the visual experiment section; the monitoring system is used for monitoring the temperature change of the contact surface of the boiling heating device and the visual experiment section. The flow boiling device can be used for adding and discharging millimeter-level particles at any time, and the dynamic behaviors of large particles and bubbles can be observed in a visual window.

The invention belongs to the technical field of LED lamps, and particularly relates to a heat dissipation structure and a high-power LED lamp with the same. The heat dissipation structure comprises a supporting plate, a concave groove is formed in the supporting plate, a heat dissipation assembly is arranged on the concave groove, a boiling box is fixedly arranged at the top of the supporting plate, and a collecting groove is formed in the top of the boiling box; condensing pipes are symmetrically connected to the collecting tank in an array mode, heat dissipation fins are fixedly arranged on the condensing pipes, a backflow box is arranged on the boiling box, and a partition plate is arranged in the backflow box. The boiling box is adopted, multiphase flow boiling enhanced heat transfer is adopted for cooling treatment, a working medium can absorb a large amount of phase change latent heat in the process of changing from a liquid state to a gas state, and therefore heat generated by working of the LED lamp is rapidly taken away, and compared with traditional pure metal heat conduction and air natural convection, huge heat can be rapidly taken away in a short time, and the service life of the LED lamp is prolonged. And the overall heat dissipation performance is improved.

This invention discloses an experimental apparatus and its fabrication and experimental method for studying the effects of local deformation in a narrow rectangular flow channel. The apparatus includes an experimental chamber formed by the detachable and sealed connection of upper and lower pressure-bearing shells, independent chambers connected at both ends, and replaceable deformable insert components. The insert body is integrally machined onto the surface of a heating plate and fixed to a placement slot in the lower pressure-bearing shell using thermally conductive adhesive. The apparatus integrates electrode components, multi-point fiber optic temperature measurement, and a liquid film sensor, and is equipped with wide and narrow viewing windows for observing bubble behavior and liquid film dynamics, respectively. The viewing windows utilize a window gasket + pressure plate + bolt structure for reliable sealing. During fabrication, each component is machined separately, then the heating plate, electrodes, and sensors are installed sequentially, and finally the upper pressure-bearing shell is closed and the viewing windows are assembled. This apparatus features a compact structure, reliable sealing, high visualization, and supports rapid replacement of deformable inserts with different geometric parameters, making it suitable for high-precision thermo-hydraulic experimental research on flow boiling and heat transfer deterioration.

The invention provides a pulsed electric field enhanced flow boiling device and a visual measurement method. The device comprises a high-precision visual heating system, a transparent electrode pulse electric field generation system and a stable flow control system, wherein the high-precision visual heating system comprises a nickel metal sheet, a transparent polytetrafluoroethylene rectangular microchannel, a Joule direct current measurement system and a high-speed camera. The nickel metal sheet can accurately measure heat flow and wall temperature through the Joule direct current measurement system; the transparent electrode pulsed electric field generating system comprises a single-layer titanium coating transparent electrode with a scale, a double-layer titanium coating transparent electrode, a high-voltage electrostatic generator and an electric travel switch. The single-layer titanium coating transparent electrode with the scale realizes flow boiling visual measurement; the stable flow control system comprises a double-layer heat preservation water tank, a peristaltic pump, a water storage tank, an inlet valve, an outlet valve, a drainage pipeline, an inlet pipeline and a backflow pipeline. The double-layer heat preservation water tank provides stable liquid level height.

The invention provides a system for measuring a two-phase boiling structure under an obliquely downward heating flow boiling condition, and relates to the technical field of nuclear safety experiment equipment, and the system comprises a cooling water flow channel which is communicated with a cooling water circulation system; the cooling water runner is provided with a measuring area, and the heater is fixedly arranged on the outer surface of the cooling water runner and corresponds to the heating surface; the probe mechanism is fixedly arranged on the outer surface of the cooling water flow channel, a probe can move in the direction close to or away from the heating surface, and the probe can be inserted into the measuring area to obtain the void fraction. The heater simulates the temperature of the molten pool and heats the outer surface of the cooling water runner so as to form a heating surface in the cooling water runner, the heating surface is used for simulating the outer wall surface of the lower sealing head, when cooling water flows along the cooling water runner, heat of the heating surface can be taken away, and scene simulation that the cooling water cools the outer wall surface of the lower sealing head is achieved. The probe is inserted into the cooling water flow channel, the void fraction of different section depths is obtained, and then the liquid film thickness is indirectly obtained.

A heat exchanger for strengthening flowing boiling phase change based on the alternating current electrowetting principle sequentially comprises a base plate, a lower-layer high-temperature-resistant gasket, hydrophobic breathable carbon paper, an upper-layer high-temperature-resistant gasket and a cover plate from bottom to top, the upper surface of the hydrophobic breathable carbon paper is a breathable face, the lower surface of the hydrophobic breathable carbon paper is a hydrophobic face, and a carbon paper sealing ring is arranged on the periphery of the hydrophobic breathable carbon paper. The upper high-temperature-resistant gasket and the lower high-temperature-resistant gasket are provided with micro-channels and are partially overlapped, the carbon paper sealing ring, the upper high-temperature-resistant gasket and the cover plate are provided with a water inlet and a water outlet respectively, the water inlet and the water outlet are communicated with the micro-channel of the lower high-temperature-resistant gasket, and the cover plate is provided with an exhaust hole which is communicated with the micro-channel of the upper high-temperature-resistant gasket. The hydrophobic breathable carbon paper is connected with an alternating current cathode.

The invention belongs to the technical field of semiconductor chip and integrated circuit packaging heat dissipation, discloses a flow boiling type manifold micro-channel heat dissipation structure suitable for a three-dimensional integrated circuit (3DIC), and aims to solve the problems of insufficient heat dissipation efficiency, non-uniform cooling distribution, difficulty in structure integration and the like in the prior art. The structure comprises a cooling medium inlet, a cooling medium outlet, a three-dimensional integrated circuit storage unit, an outer packaging shell, a manifold micro-channel guide plate, a manifold fine cooling channel, a chip layer, a through silicon via (TSV) and a high-power discrete heat source. The cooling channel adopts a special-shaped manifold network structure, the equivalent diameter of the channel is 10-500 microns, and a coarse structure is arranged in the cooling channel to strengthen boiling heat exchange; and a micro control valve is also arranged, so that the cooling liquid flow of each layer can be independently and steplessly adjusted.

The invention relates to a micro-channel flow boiling test system capable of adjusting heat flow and a measurement method. The system comprises a cooling working medium circulating system, a heating system, a flow visualization system and a data acquisition and display system. The micro-channel flow boiling heat exchange characteristic test is carried out under different types of heat flow, the actual heat source heating working condition is simulated, and the specific influence of the heat source property on the flow boiling heat exchange process in the micro-channel is obtained by comparing the flow heat transfer performance data under different types of heat flow. Compared with the prior art, the device has the advantages of avoiding backflow of bubbles at the outlet of the micro-channel under a low heat flow condition, realizing accurate measurement of dynamic behaviors and flow patterns of the bubbles in the micro-channel, and the like.

The invention discloses a supercooled flow boiling in-situ observation device and method under ultrahigh heat flow, and belongs to the technical field of divertor heat exchange structure optimization, the device comprises an electron gun system, a vacuum system, an optical observation system and a water circulation system, and the vacuum system is connected with the electron gun system, the optical observation system and the water circulation system. According to the device, an electronic gun and a water circulation system are used for simulating the real service condition of a divertor test piece in a fusion reactor, and the divertor test piece can be tested by adjusting the cooling water condition in the divertor test piece, adjusting an optical observation light path, vacuumizing a vacuum box and the electronic gun, carrying out high heat flow loading on the divertor and the like. In-situ observation is carried out on supercooled flow boiling under ultrahigh heat flow, and the optimization direction of a heat exchange structure is determined. According to the invention, the problems of low heat flux density and difficulty in simulation of extreme conditions in existing supercooled flow boiling in-situ observation are solved, supercooled flow boiling in-situ observation under ultrahigh heat flow is realized, and a basis is provided for optimization of a divertor heat exchange structure.

The present invention discloses an adaptive controllable electric field enhanced spiral tube flow boiling heat transfer system belonging to the field of enhanced heat transfer technology. The spiral tube flow boiling heat transfer system includes a spiral tube heat exchanger, a thin film electrode, a temperature sensitive element, a temperature sensor, a control system, and a high-voltage AC power supply. The spiral tube heat exchanger is provided with a pair of thin film electrodes in the circumferential and axial directions, thereby forming a controllable high-voltage electric field in the spiral tube bundle; the spiral tube heat exchanger with a pair of thin film electrodes designed by the present invention can be coupled with an external electric field regulated by feedback from the control system to realize automatic control of the gas-liquid two-phase state of the flow boiling process in the spiral tube, effectively solving the problems of lack of active regulation of the flow boiling process under dynamic conditions in the spiral tube flow boiling and poor circumferential and axial heat transfer, thereby achieving the purpose of enhanced heat transfer.

This application provides a targeted immersion phase change heat sink, relating to the field of electronic device heat dissipation technology, to address the problems of large coolant consumption and potential safety hazards. It includes a housing and a microchannel heat dissipation structure. The housing is equipped with cooling medium pipelines and vapor pipelines. The microchannel heat dissipation structure is disposed within the housing, with its cooling medium inlet connected to the cooling medium pipelines. The cooling medium is introduced into the microchannel heat dissipation structure, where it undergoes flow and boiling. The resulting two-phase fluid, after absorbing heat, exits from the cooling medium outlet of the microchannel heat dissipation structure into the immersion chamber of the housing. Vapor enters the gas phase space and exits through the vapor pipeline, while liquid remains in the liquid phase space of the immersion chamber and flows over the outer surface of the microchannel heat dissipation structure, which has a porous layer. By concentrating two-phase immersion cooling and flow boiling cooling within a single housing, only localized cooling of the chip is achieved, reducing coolant consumption and providing a stable and reliable thermal management environment.

The embodiment of the invention relates to the technical field of nuclear reactor thermal hydraulic calculation, in particular to a method for determining the flow boiling heat transfer coefficient of a reactor based on a back propagation neural network model and a device for determining the flow boiling heat transfer coefficient of the reactor based on the back propagation neural network model. Comprising the following steps: acquiring target liquid medium flow boiling data and a back propagation neural network model of a reactor; and inputting the flow boiling data of the liquid medium into the back propagation neural network model to obtain the flow boiling heat transfer coefficient of the reactor. According to the method, the target liquid medium flow boiling data of the reactor is input into the back propagation neural network model to obtain the flow boiling heat transfer coefficient of the reactor, and compared with a traditional method for determining the flow boiling heat transfer coefficient, the prediction efficiency and prediction precision of the flow boiling heat transfer coefficient can be improved; meanwhile, the method is good in robustness, and can be widely applied to different application scenes.

The embodiment of the invention provides a double-immersion type flow boiling phase change radiator which is arranged in an immersion box body, exchanges heat with liquid in the immersion box body, and comprises a micro-channel structure, a first cooling working medium pipeline and a second cooling working medium pipeline, a plurality of fins arranged in an array are arranged in the micro-channel structure to form a micro-channel group, and the first cooling working medium pipeline is communicated with an inlet of the micro-channel group and conveys a cooling working medium to the micro-channel group; the outlet of the micro-channel group is fully open and is communicated with the liquid storage cavity of the immersion box body; the micro-channel structure is provided with a cover plate in the thickness direction of the micro-channel structure, the cover plate is provided with a fence structure, the second cooling working medium pipeline communicates with the fence structure and conveys a cooling working medium into the fence structure, the fence structure is used for guiding the cooling working medium to flow through the outer surface of the cover plate, and the outer surface is provided with a porous layer. Double-layer immersed cooling formed by the micro-channel structure and the cover plate can improve the heat exchange performance, accelerate bubble separation, reduce the dryness of two-phase fluid and realize high-power and high-heat-flux heat dissipation.

The invention provides a flow boiling multiphase flow heat transfer strengthening device based on an aerophilic degassing film and a working method, and belongs to the technical field of two-phase flow and heat transfer strengthening. The problems that in the micro-channel flowing boiling process, bubbles cannot be discharged in time, so that flow distribution is uneven, critical heat flow is advanced, and the temperature rises abnormally are solved. The device comprises a sample piece upper layer, an aerophilic degassing structure layer, a star-shaped aerophilic degassing structure, a sample piece lower layer, diamond needle-shaped ribs, a sample piece inlet water collecting chamber, a vacuum negative pressure chamber and a sample piece outlet water collecting chamber, the aerophilic degassing structure layer is installed between the sample piece upper layer and the sample piece lower layer, and the space formed between the left end of the sample piece upper layer and the sample piece lower layer is the sample piece inlet water collecting chamber; a space formed between the right end of the sample piece upper layer and the sample piece lower layer is a sample piece outlet water collecting chamber, and the middle of the sample piece upper layer and a vacuum negative pressure area in the middle of the aerophilic degassing structure layer form a vacuum negative pressure chamber. The heat dissipation system is mainly used for achieving rapid separation and efficient discharge of bubbles.

The application discloses a device for measuring flow boiling characteristics of high-temperature and high-pressure subcooled water in a micro channel, which comprises a water tank, a first valve, a filter, a high-pressure constant-flow pump, a mass flowmeter, a second valve, a heating test system, a fifth valve, a condenser, a back pressure valve and a float flowmeter connected in sequence through pipelines, and the float flowmeter is further communicated with the water tank through a pipeline; a first temperature sensor is further arranged on the pipeline between the second valve and the heating unit; a data acquisition and display system is further arranged, and the mass flowmeter, the heating test system and the float flowmeter are connected with the data acquisition and display system. The device solves the problems of high cost, low operation reliability and unstable test parameters of the high heat flow subcooled boiling test platform in the prior art. A method for measuring flow boiling characteristics of high-temperature and high-pressure subcooled water in a micro channel is further disclosed.

The embodiment of the invention relates to the technical field of nuclear reactor thermal hydraulic calculation, in particular to a method for determining the flow boiling heat transfer coefficient of a reactor based on a random forest prediction model and a device for determining the flow boiling heat transfer coefficient of the reactor based on the random forest prediction model. The method comprises the following steps: acquiring liquid medium flow boiling data of a reactor and a random forest prediction model; and inputting the flow boiling data of the liquid medium into the random forest prediction model to obtain the flow boiling heat transfer coefficient of the reactor. Compared with a traditional method for determining the flow boiling heat transfer coefficient, the method provided by the embodiment of the invention can improve the prediction efficiency of the flow boiling heat transfer coefficient, the accuracy of the obtained flow boiling heat transfer coefficient is high, meanwhile, the robustness of the method is good, and the method can be widely applied to different application scenes, for example, the prediction efficiency of the flow boiling heat transfer coefficient is improved. The heat transfer performance of heat transfer equipment such as a heat exchanger in the reactor is predicted, and the purposes of assisting design and safety analysis of reactor cores and components of the reactor are achieved.

The invention relates to the technical field of micro-channel heat exchangers, and discloses an interconnected manifold micro-channel heat exchanger and a visual boiling experiment device thereof. The heat exchanger is composed of a micro-channel module and a manifold module. The micro-channel module comprises fins arranged in an array mode, micro-channels formed between the adjacent fins, interconnection grooves communicating the adjacent rows of micro-channels and a base structure. The manifold module is made of light-transmitting materials, and the interior of the manifold module is divided into an inlet pressurization area and an outlet pressurization area through a manifold wall, and the inlet pressurization area and the outlet pressurization area are communicated with an inlet manifold and an outlet manifold which are of branch structures respectively. The two modules are communicated through the manifolds and the microchannels to achieve fluid interaction, and an overall flow path is formed. According to the design, the flow channel connectivity is optimized through the interconnection grooves, flow boiling visual observation is achieved through the light-transmitting manifold modules, parts are convenient to replace through the modular structure, and the technical bottlenecks that a traditional manifold micro-channel heat exchanger is too early in heat transfer deterioration, a visual experiment device is difficult to construct, and assemblies are inconvenient to maintain are comprehensively solved.

The invention discloses a monitoring system and a monitoring method for kinetic parameters of bubbles flowing and boiling under the action of ultrasonic waves. The monitoring system comprises a refrigerant circulation loop, a cooling water circulation loop and a monitoring device, the refrigerant circulation loop comprises a liquid storage tank, a subcooler, a miniature magnetic driving pump, a preheating section and an experimental section which are communicated through a pipeline; the monitoring device comprises a differential capacitance device and a C4D device which are respectively mounted at the positions, close to an inlet and an outlet, of the experimental section, an ultrasonic transducer mounted at the front end of the inlet of the experimental section, and a pressure sensor at the outlet of the experimental section; according to the monitoring method, the monitoring system is adopted to carry out non-contact identification on the flowing boiling flow pattern at the outlet of the non-transparent heating micro-channel. According to the invention, real-time monitoring of the local cavitation rate of the opaque rectangular micro-channel can be realized, the flow pattern characteristics near the outlet of the experimental section and the relative magnitude of the interfacial force can be accurately displayed, and the monitoring precision and reliability of the bubble kinetic parameters are obviously improved.

The present application relates to a kind of plate heat exchanger refrigerant flow boiling heat flow simulation method and the prediction system of the method is executed, by based on nucleation point approximation Poisson distribution and dryout region wall heat flow partition model, nucleation point distribution and its influence on heat transfer are characterized, while through the wall surface partition design of space-time two dimensions, wall heat flow partition model covering full boiling condition is built, in combination with the multi-item coupling calculation of total heat flow and the fine modeling of dryout region, the prediction interval of boiling heat transfer is effectively widened, can realize nucleate boiling, critical heat flow and the accurate calculation of wall heat flow of transition boiling full working condition.

The invention discloses a flow boiling liquid cooling plate structure and a design method thereof.The flow boiling liquid cooling plate structure comprises a plate body and regulation blocks, the plate body is provided with an inlet and an outlet, and the multiple regulation blocks are evenly distributed in the plate body and located between the inlet and the outlet; the regulation and control block is provided with an incident flow surface facing the inlet, a back flow surface facing the outlet, a sliding boundary line for connecting the incident flow surface and the back flow surface, an incident flow ridge line and a wake contour line for connecting the incident flow surface and the back flow surface with the plate body respectively, a plurality of micro pits and a plurality of micro grooves which are uniformly formed in the incident flow surface, and a plurality of micro bosses which are uniformly arranged on the back flow surface; through the synergistic effect of macroscopic and microcosmic structural design and function partition, the regulation and control block can effectively regulate and control the vapor-liquid interface evolution process under the condition that strong turbulent flow disturbance is not introduced, and therefore efficient heat exchange and low flow resistance are both considered under the working condition of high heat flux density.

The utility model discloses a flow boiling experiment device. The flow boiling experiment device comprises a base and an upper cover. A groove, an inlet and an outlet are formed in the base, a plurality of protrusions are arranged on the bottom wall of the groove at intervals in the width direction of the groove and extend in the length direction of the groove, a flowing groove is defined between every two adjacent protrusions, and gasification grooves extending in the length direction of the flowing groove are formed in the bottom wall of each flowing groove. One end of each flowing groove is communicated with the inlet, and the other end of each flowing groove is communicated with the outlet; the upper cover is a transparent piece, covers the base and is used for sealing the opening of the groove. According to the flow boiling experiment device provided by the utility model, the critical heat flux density can be effectively improved, and the heat exchange effect of the cooling working medium is improved.

The invention provides a micro-channel slug flow boiling heat transfer theoretical calculation method, which is characterized in that a model innovatively divides a flow boiling process in a micro-channel into five areas, namely a bubble free growth area, a liquid slug area, a lengthened bubble area, a partial drying area and a complete drying area. In the free growth area, the model particularly introduces a free growth mechanism of bubbles starting from an extremely small size, and the mechanism allows the bubbles to freely expand according to the energy balance principle under the condition of not being influenced by external force until the bubbles reach physical limitation in the length or width direction of the micro-channel. Through refined simulation of the stage, the model can more truly reflect the morphological change and speed distribution of the bubbles in the growth process, and then a theoretical calculation basis is provided for a heat transfer module. The prediction capability of the model under the low steam quality condition is enhanced and the calculation precision is improved by considering the bubble free growth stage, the evaporation and shearing dual effects during liquid film thinning and the bubble flow and heat transfer change during the low capillary number.