19 results about "Flow boiling" patented technology

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 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 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.

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 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 application discloses a kind of superhigh heat flow under supercooled flow boiling in situ observation device and method, belong to the technical field of partial filter heat exchange structure optimization, the device includes electron gun system, vacuum system, optical observation system and water circulation system, vacuum system is connected with electron gun system, optical observation system and water circulation system respectively.The device uses electron gun and water circulation system to simulate the real service condition of partial filter test piece in fusion reactor, by adjusting the cooling water condition inside partial filter test piece, adjusting optical observation light path, vacuumizing vacuum box and electron gun, high heat flow loading to partial filter and other steps, superhigh heat flow under supercooled flow boiling is observed in situ, and the optimization direction of heat exchange structure is determined.The application solves the problem that existing supercooled flow boiling in situ observation heat flux is low and difficult to simulate extreme conditions, realizes superhigh heat flow under supercooled flow boiling in situ observation, and provides basis for partial filter heat exchange structure optimization.