950 results about "Contact heat" patented technology

The invention discloses a high-temperature surface contact thermal resistance elimination method based on double thermocouple compensation, and belongs to the technical field of material thermal property characterization and testing. The method comprises the following steps: synchronously acquiring double-thermocouple temperature, and obtaining a temperature difference signal through filtering calibration and environment correction; calculating the real-time heat flux density according to the corrected temperature difference, the Seebeck coefficient and the dynamic correction factor; establishing a nonlinear dynamic coupling model containing contact thermal resistance parameters, and performing temperature interval division; identifying a contact thermal resistance parameter on line by adopting a self-adaptive recursive least square algorithm, and generating a dynamic thermal resistance compensation value; and applying the compensation value to a double-thermocouple signal according to the weight, and outputting accurate high-temperature surface temperature. According to the method, data acquisition and preprocessing, dynamic heat flow correction, nonlinear segmented modeling, self-adaptive online identification and refined compensation output strategies are adopted, the influence of high-temperature surface contact thermal resistance can be effectively eliminated, and the accuracy and reliability of temperature measurement in the high-temperature environment are remarkably improved.

The invention discloses a self-correction optimization method and system for heat transfer boundary conditions of a water jacket heater, and particularly relates to the technical field of condition optimization control. The method comprises the following steps: constructing a thermal fatigue deformation trend estimation model by collecting a furnace wall surface temperature sequence, furnace wall surface heat flux distribution information and a furnace wall thermal stress response curve of a furnace body structure component, and generating a geometric parameter drift vector; performing structure equivalent mapping analysis on the geometric parameter drift vector, and extracting contact thermal resistance change information; performing furnace wall heat flow field reconstruction on the geometric parameter drift vector to obtain a dynamic correction vector; and the contact thermal resistance change information and the heat flow correction vector are comprehensively analyzed, a time-varying boundary condition inversion model is constructed, and a multi-parameter coupling boundary correction set is output and used for updating the boundary conditions in the water jacket heating furnace heat transfer simulation model, so that identification and self-adaptive correction of the boundary conditions are realized, and the heat transfer control precision and the heat efficiency are improved.

Disclosed in the present invention is a heat dissipation structure integrating a heat dissipation plate and a phase change heat transfer device, comprising a heat dissipation plate and a vapor chamber. The heat dissipation plate is provided with a flow channel allowing for flowing of a dielectric material, an inlet allowing for flowing of the dielectric material into the flow channel, and an outlet allowing for flowing of the dielectric material from the flow channel. In addition, the upper end surface of the heat dissipation plate is further provided with an opening, and the vapor chamber is blocked on the opening in the upper end surface of the heat dissipation plate to directly perform contact heat transfer with the dielectric material in the heat dissipation plate. The present invention can efficiently solve the problem of insufficient heat exchange efficiency between the vapor chamber and a cooling medium material during composite heat dissipation of the vapor chamber and the heat dissipation plate, and effectively improve the cooling efficiency of the composite heat dissipation mode of the vapor chamber and the heat dissipation plate. Since the vapor chamber has high structural requirements, there is no need to make significant modifications to components, and in the present application, there is no need to change the internal structure of the vapor chamber, thereby making the production and processing easier to implement.

The invention discloses a heat dissipation control method and device for a single-phase immersed liquid cooling charging pile and a medium, and relates to the technical field of battery thermal management, and the method comprises the steps: carrying out the high-precision scanning and dynamic feature extraction of a built-in fiber grating array of a cold plate according to a partition flow control signal, and obtaining a temperature field matrix and a dynamic thermal feature set; performing multi-dimensional fusion analysis and electrochemical coupling analysis on the temperature field matrix and the dynamic thermal feature set to generate a thermal coupling parameter set; performing real-time risk quantitative evaluation and risk topological mapping on the thermal coupling parameter set, and outputting a risk topological data set; and performing cooling intensity dynamic modulation according to the risk topology data set, and obtaining a partition flow redistribution instruction. According to the invention, fine monitoring of the cold plate-battery interface contact thermal resistance is realized through a high-precision pressure field reconstruction technology, the accuracy and reliability of pressure distribution detection are significantly improved, and the local overheating risk caused by an assembly gap is effectively eliminated.

The invention discloses a radiator thermal efficiency full-detection test system, which belongs to the technical field of radiators and is provided with a heat source simulation module, an environment simulation module, an energy efficiency circulation module, a measurement and control analysis module and a digital twin module. The heat source simulation module is responsible for accurately simulating the heating behavior of an electronic device and achieving dynamic compensation of heat radiator contact thermal resistance, the environment simulation module is used for constructing a stable temperature and humidity environment and isolating external interference, and the energy efficiency circulation module is used for multi-energy collaborative supply and energy gradient utilization. The energy efficiency circulation module provides cold and hot medium water for the heat source simulation module and conveys constant-temperature cooling water to the environment simulation module, and the valve opening degree is adjusted by the measurement and control analysis module. The measurement and control analysis module undertakes full-process data acquisition and performance analysis tasks, and the digital twinning module realizes virtual-real interactive simulation and artificial intelligence optimization; the radiator thermal efficiency full-detection test system solves the technical problem of how to improve the detection efficiency of the radiator thermal efficiency.

A packaging system for a hot water heater includes an outer box, a top insert, an offset filler, a base insert, and one or more side panels. The top insert contacts a top surface of the hot water heater and a top inside surface of outer box. The offset filler is coupled to the top insert and is sandwiched between the hot water heater and the outer box. The base insert contacts the bottom surface of the hot water heater and a bottom inside surface of the outer box. The base insert includes raised perimeter structures that form a shape that matches a shape of the bottom surface of the hot water heater. Each side panel includes a raised pattern.

A composite liquid-cooling heat-dissipation device based on jet flow and two-phase flow circulation, comprising a vapor chamber element and a semi-open housing. The vapor chamber element comprises an upper cover and a lower plate; the upper cover has an upper surface; with respect to the upper cover, the lower plate has a lower surface for coming into contact with a heat source; when the upper cover is coupled to the lower plate, a closed cavity is formed; a heat absorption area of the vapor chamber element is located on the lower plate, and a condensation area of the vapor chamber element is located on the upper cover; the semi-open housing is coupled to the lower plate of the vapor chamber element to form a heat exchange cavity; the semi-open housing is provided with a spraying head, an input port, and an output port; the input port is used for inputting a cooling liquid; and the spraying head is connected to the input port to first splash the cooling liquid on the upper surface of the upper cover, and then enable the cooling liquid to flow through the heat exchange cavity to output the cooling liquid through the output port.

The invention discloses a lithium iron phosphate positive electrode material rich in oxygen vacancies and a preparation method and application thereof.The preparation method of the lithium iron phosphate positive electrode material rich in oxygen vacancies has the advantages that the number of heating times can be set in a programmable mode, the heating and cooling speed is high, and the heat treatment time is short; the volatilization amount of the lithium salt is small, and the method is more economical and environment-friendly; according to the method, a programmable constant-current power supply is used for electrifying and heating the carbon-based Joule thermal material, and the carbon-based material is used as a heating stage to realize ultrafast synthesis of the lithium iron phosphate material through a physical contact heat transfer effect; and the oxygen vacancy content can be adjusted by regulating and controlling parameters such as temperature and time. The heat treatment is performed in a specific atmosphere (such as vacuum, inert gas, reducing gas and oxidizing atmosphere), so that the reoxidation of the oxygen vacancies can be reduced, and the formation and the stabilization of the oxygen vacancies are facilitated; the adjustable and controllable range of the oxygen vacancy concentration in the lithium iron phosphate material prepared by the preparation method disclosed by the invention is 2.198 E12 to 7.382 E13Spins / mm < 3 >.

The invention provides an ultrathin liquid metal thermal interface material based on dynamic infiltration regulation and a preparation method, the ultrathin liquid metal thermal interface material is composed of a high-purity liquid metal main body and liquid metal dynamic infiltration adhesion layers connected to the two sides of the high-purity liquid metal main body, the material of the liquid metal dynamic infiltration adhesion layer is the same as that of the high-purity liquid metal main body, and the liquid metal dynamic infiltration adhesion layer is spread on the surface of the heating substrate and the surface of the heat dissipation substrate respectively. According to the method, the ultrathin metal liquid layer formed through dynamic infiltration is directly used as a heat transfer medium, molecular-level seamless attachment between the liquid metal and the substrate material interface is achieved, the ultrathin thermal interface with the minimum thickness of only nanoscale 1-1000 nm can be obtained, the contact thermal resistance is greatly reduced, the actually measured interface thermal conductivity can reach 25.9-47.1 W / m <-1 >. K <-1 >, and the thermal conductivity of the interface is greatly improved. The measured value far exceeds the measured value of the current commercial thermal interface material; the dynamic infiltration regulation and control means provided by the invention has universality and can be widely applied to various different heating and heat dissipation substrate materials.

A heat dissipation device includes a vapor chamber for contacting a heat source; at least one heat pipe having a first end and a second end connected to the vapor chamber; at least one partition disposed inside the heat pipe to partition the inside of the heat pipe into a first channel and a second channel isolated from each other; and a heat dissipation fin set disposed on the vapor chamber and partially covers the heat pipe. The vapor chamber is filled with a liquid working medium that absorbs the heat of the heat source and then gasifies into a gaseous working medium. The gaseous working medium moves into the first channel and the second channel to be condensed by the heat dissipation fin set, so the gaseous working medium is liquefied into the liquid working medium, and then the liquid working medium flows back into the vapor chamber.

The invention discloses a high-heat-flux heat dissipation system for an on-orbit computing power cluster, and belongs to the technical field of spacecraft heat control. The system is independent of a satellite conventional thermal control platform and is specially used for discharging waste heat of an AI calculation array. The system comprises a heat capture unit, a pumpless heat transfer unit and a foldable heat dissipation unit. The heat transmission unit comprises a micro-channel flexible pulsating heat pipe (such as a diamond film material), and the heat pipe spans a folding area and has the functions of structural connection and heat transmission, so that a thermal low-impedance independent channel relative to a satellite structure is formed. Through the design of removing a mechanical pump and removing a mechanical hinge, the problems of large weight, micro-vibration interference, high contact thermal resistance and the like of a heat dissipation system of the computing power satellite are solved, and preferential directional heat dissipation of high-flux heat is realized.

The invention discloses an interface heat conductivity coefficient distribution optimization design method and system for improving the contact thermal performance of an assembly interface, and the method comprises the steps: obtaining the contact heat dissipation surface microstructure features of a part of an electronic chip packaging system, and constructing a contact thermal performance numerical analysis model; performing multiple iterations on the heat conductivity coefficient distribution of the design area by adopting a contact thermal performance numerical analysis model to obtain the heat conductivity coefficient distribution and contact thermal resistance; judging whether each iteration meets an iteration convergence criterion or not according to the heat conductivity coefficient distribution and the contact thermal resistance; and if the iterative convergence criterion is met, outputting heat conductivity coefficient distribution and contact thermal resistance. The temperature transfer path of the assembly interface is controlled by designing the surface heat conductivity coefficient distribution of the assembly interface, and temperature gradient distribution homogenization is truly achieved by applying the innovative design thought of'heterogeneous' heat conductivity coefficient distribution.

A combination heat dissipation structure includes a vapor chamber and at least one heat pipe. The vapor chamber defines an airtight chamber filled with a working fluid and provided with first and second wick structures. The vapor chamber further includes at least one through hole formed on its upper wall and communicable with the airtight chamber, and annular elements provided in the airtight chamber corresponding to the through hole to contact with the first and second wick structures. The heat pipe has an open end inserted into the airtight chamber to contact with the first wick structure, such that the heat pipe is axially supported and located by the annular elements. With these arrangements, a flow-back path between the vapor chamber and the heat pipe is largely shortened to avoid dry burning in the vapor chamber and upgrade the two-phase heat exchange efficiency of the vapor chamber.

The invention relates to a flue gas circulation waste heat utilization type steel mill solid waste treatment process, which specifically comprises the following steps: mixing a solid waste raw material with fuel, pretreating, feeding into a rotary kiln, reacting in the rotary kiln to generate first flue gas, cooling the first flue gas, and purifying in a desulfurization process to form second flue gas, the third flue gas enters a cooling section of the rotary kiln, and iron-containing materials in the rotary kiln are cooled to form fourth flue gas; the fourth flue gas and the first air enter the second waste heat utilization device and then are subjected to non-contact heat exchange to form fifth flue gas, the first air is subjected to heat exchange through the second waste heat utilization device to form second air, the second air and the gas fuel enter the high-temperature calcination section of the rotary kiln to be combusted to form the first flue gas, and therefore cyclic utilization is achieved. And the third flue gas is adopted as the cooling flue gas to cool the high-temperature iron-containing material in the cooling section of the rotary kiln, so that the problem that the zero-valent iron reduced by the rotary kiln is easily oxidized into iron oxide again is solved.

The invention belongs to the technical field of solar photo-thermal power generation, and discloses a tower type solar power generation system based on lunar soil particle moving bed heat exchange, which utilizes local materials of lunar soil to prepare solid heat storage particles as a heat transfer and heat storage medium, greatly reduces the mass and volume of the system and the cost and risk of transporting materials from the earth, and improves the energy efficiency. The efficient particle moving bed heat exchanger combining the particle receiver and the heat collector utilizes direct efficient contact heat exchange between solid particles and between the particles and a heat exchange working medium, has the characteristics of high heat exchange efficiency, small heat loss and compact structure, and is particularly suitable for space vacuum and microgravity environments; it is ensured that heat is reliably and stably transmitted to the Brayton cycle power generation system from concentrated solar energy, and power is generated through the Brayton cycle power generation system.

A combination heat dissipation structure includes a vapor chamber and at least one heat pipe. The vapor chamber defines an airtight chamber filled with a working fluid and provided with first and second wick structures. The vapor chamber further includes at least one through hole formed on its upper wall and communicable with the airtight chamber, and annular elements provided in the airtight chamber corresponding to the through hole to contact with the first and second wick structures. The heat pipe has an open end inserted into the airtight chamber to contact with the first wick structure, such that the heat pipe is axially supported and located by the annular elements. With these arrangements, a flow-back path between the vapor chamber and the heat pipe is largely shortened to avoid dry burning in the vapor chamber and upgrade the two-phase heat exchange efficiency of the vapor chamber.

The invention belongs to the field of high-temperature thermal structure optimization design, and discloses a high-temperature structure thermal-mechanical coupling topological optimization method considering thermal contact. The method comprises the following steps: establishing a thermal-mechanical coupling finite element analysis method containing a contact thermal resistance interface; carrying out thermal coupling analysis on the high-temperature structure on the basis of the thermal coupling finite element analysis method containing the contact thermal resistance interface in the steps, and establishing a topological optimization model containing a plurality of constraints; performing sensitivity solving on the objective function and the constraint function of the topological optimization model to obtain a sensitivity column formula; filtering the sensitivity through a density filtering method; and updating variables in the topological optimization model by adopting a moving asymptote optimization algorithm MMA. A contact problem is expanded to a thermal-mechanical coupling structure, fine design of a high-temperature structure containing thermal contact is facilitated, and meanwhile, a regulation and control mechanism of contact thermal resistance to the thermal-mechanical coupling structure is given through an optimization result, so that the fine degree of design of the high-temperature structure containing thermal contact is improved.

The invention relates to the technical field of temperature control, in particular to a multi-dimensional compensation ablation system temperature control system, method and device and a medium. The system calculates a medium texture index representing the structural change of the load medium by synchronously acquiring electrical parameters and ultrasonic image data; constructing an anti-interference control model comprising an extended state observer, and defining energy transmission loss caused by contact thermal resistance as an extended state variable; calculating an adaptive correction factor based on the texture index, dynamically correcting the state updating process of the observer to obtain an energy loss correction estimated value, and constructing a compensation control model to adjust the output power according to the energy loss correction estimated value; according to the invention, the technical problem of incomplete heating caused by false high temperature of the sensor and system misjudgment due to state deterioration of the contact interface is effectively solved; accurate reconstruction and closed-loop compensation of effective heat flow in a non-ideal contact environment are realized, sufficient energy penetration can still be maintained even if contact thermal resistance is sharply increased, and the integrity of an ablation area is guaranteed.

The invention discloses a thermal analysis method of a heterogeneous material combined component considering multi-scale contact thermal resistance, and belongs to the technical field of aero-engine thermal management. The method comprises the following steps: firstly, establishing a period calculation model of a CMC outer ring and metal casing combined member, secondly, setting anisotropy of CMC heat conduction according to geometric profile change of a gas outer ring, and finally, introducing an empirical relation expression of contact thermal resistance by setting equivalent heat conduction of a contact area between the CMC outer ring and the metal casing in CFD calculation. The difference between the two is explored by comparing the temperature field results of the combined component with or without the contact thermal resistance, and the influence of the contact thermal resistance on flowing heat exchange is explored. According to the method, by considering the multi-scale contact thermal resistance between different materials, the influence of the contact thermal resistance on the turbine flow heat exchange result is researched, meanwhile, the temperature field of the turbine component in CFD calculation is corrected, and a guidance basis is provided for improving the prediction precision of the temperature result of the gas turbine component under the complex gas thermal load.

The invention provides a high-voltage cable intermediate joint fireproof early warning device convenient to maintain, which comprises an inner shell and an outer shell which are symmetrical and split, the outer shell is sleeved outside the inner shell, an inner sealing cavity penetrating to the outside is symmetrically arranged in the inner shell, the inner sealing cavity is used for installing a wrapped joint, and the inner sealing cavity is used for sealing the wrapped joint. And heat conduction structures are symmetrically arranged on the inner shell. According to the cable connector, when the cable connector generates heat, the heat is dissipated out through the contact heat conduction structure, so that the temperature of the connector is reduced, when the temperature continuously rises, cooling liquid in the gas storage bottle is sprayed out from one end of the upper shell to cool the upper shell, and gas in the gas storage bottle also has the fire extinguishing capacity; when a line is on fire due to overload or aging, the gas storage cylinder can extinguish the generated flame, so that the installability of the line is improved, the probability of fire disasters is reduced, and meanwhile, an early warning effect is achieved, and the situation of cable fire disasters is reduced.

The utility model relates to a horizontal fluidized bed drying machine for xanthate production, and belongs to the technical field of drying machines, the horizontal fluidized bed drying machine comprises a drying machine main body, an exhaust pipe is fixed on the upper surface of the drying machine main body, and an induced draft fan is fixed on one side, far away from the drying machine main body, of the exhaust pipe. According to the horizontal fluidized bed drying machine for xanthate production, materials are fed into the drying machine body from the feeding hopper, hot air is fed into the drying machine body through the air feeder, the materials are subjected to fluidized drying in the hot air, the dried air is exhausted through the exhaust pipe, the induced draft fan and the heat exchanger conduct heat recovery, and the motor drives the worm, the worm gear, the two-way screw, the toothed plate, the gear and the threaded rod to rotate. The movable block, the connecting rod, the rotating rod and the shifting plate move left and right, materials are evenly distributed on the net plate, it is ensured that the materials make full contact with hot air, the drying effect is improved, it is ensured that the materials are evenly distributed and make full contact with the hot air, the drying efficiency is improved, energy consumption is reduced, the product quality is ensured, and the market competitiveness is improved.

The invention discloses a phase change heat management packaging structure for a conformal antenna of a hypersonic flight vehicle, and belongs to the technical field of conformal antennae, the phase change heat management packaging structure comprises a phase change cold plate and a packaging shell located on the upper surface of the phase change cold plate, the phase change cold plate and the packaging shell are conformal with the antenna, the contact heat resistance can be reduced, the conformal phase change cold plate provides additional mechanical support, and the packaging shell is not prone to deformation. The stability of the whole structure is improved; the phase change cold plate comprises a base and a surface end cover, the surface end cover comprises a plurality of strip-shaped hollow parts; the surface end cover is located above the base to form a cavity filled with phase change materials, a plurality of fins and a plurality of protruding parts are further arranged in the cavity, each protruding part comprises a long groove, the orthographic projection of each strip-shaped hollow-out part coincides with the orthographic projection of the corresponding long groove in the direction perpendicular to the plane where the phase change cold plate is located, and the phase change cold plate is formed. The fins are located on the outer surface of at least one side wall in each protruding part, so that the filling rate of the phase change material can be increased, the occupied volume is reduced, and the heat conduction effect is improved.

The invention aims to provide the system and the method for precisely measuring the heat conduction performance of the vapor chamber, which can eliminate errors caused by contact thermal resistance by utilizing the vapor chamber, and is high in spatial resolution and non-destructive in test. The uniform temperature plate heat conduction performance precision measurement system comprises a temperature measurement module, the temperature measurement module comprises a heating module and a plurality of measurement modules, each measurement module comprises a thermocouple probe and a force adjusting mechanism which are connected, and each thermocouple probe comprises a T-shaped thermocouple, a positive electrode temperature measurement pressure head and a negative electrode temperature measurement pressure head. The positive temperature measuring pressure head and the negative temperature measuring pressure head are mutually independent and are arranged in a floating mode relative to the force adjusting mechanism, the positive temperature measuring pressure head is provided with a copper thermocouple wire connected to the positive electrode of the T-type thermocouple, and the negative temperature measuring pressure head is provided with a constantan thermocouple wire connected to the negative electrode of the T-type thermocouple. The copper thermocouple wire and the constantan thermocouple wire are short-circuited and form a thermocouple loop when being in contact with the vapor chamber at the same time; the method is realized based on the measurement system. The method is applied to the technical field of vapor chamber testing.

The invention discloses an axial magnetic flux motor based on half-cycle oil injection cooling and an oil injection cooling method thereof.The axial magnetic flux motor comprises motor shells, the two motor shells are symmetrically installed, the two stator assemblies are arranged in the two motor shells respectively, the rotor assembly is arranged between the two stator assemblies through an output shaft, and the rotor assembly is arranged between the two stator assemblies through an output shaft. The two stator assemblies are arranged on the two motor shells, the half-cycle oil injection cooling assemblies are arranged on the two motor shells and correspond to the upper half parts of the two stator assemblies, and the confluence oil outlet assemblies are arranged on the two motor shells and correspond to the bottoms of the two stator assemblies. The heat exchange efficiency is far higher than that of indirect cooling, and meanwhile, the two rows of half-cycle arc-shaped oil nozzles ensure that the cooling oil covers all winding coils, shunt cooling and auxiliary casing flow channel structures, the heat dissipation uniformity is improved, and the problem that the heat dissipation effect of the motor is poor is solved.

The invention relates to a solid hydrogen storage system cooperating with a fuel cell to quickly respond, which comprises a solid hydrogen storage device, a vortex tube and a fuel cell, the vortex tube comprises a vortex tube hydrogen inlet, a vortex tube cold end and a vortex tube hot end, the vortex tube hydrogen inlet is connected with the outlet of the solid hydrogen storage device, and the vortex tube cold end is connected with the outlet of the solid hydrogen storage device. The cold end of the vortex tube is respectively communicated with an inlet of the solid hydrogen storage device and an inlet of the fuel cell through a cold end reversing valve; the hot end of the vortex tube is respectively communicated with an inlet of the solid hydrogen storage device and an inlet of the fuel cell through a hot end reversing valve; the vortex tube is used for compressing the hydrogen to heat or cool the hydrogen, the hydrogen enters the hydrogen storage device to be heated or cooled, convection is more sufficient and direct from the heat exchange angle, and therefore the problems that the heat exchange efficiency is insufficient, contact heat resistance exists on the surface, and heat exchange is limited by the heat conduction efficiency of the bottle body can be solved; and the response time of the hydrogen storage alloy can be greatly shortened.

The invention provides a force thermal electric field coupling method based on an inclined crown spring connector, and belongs to the field of electric connector design and optimization analysis, and the method specifically comprises the following steps: S1, building a single-terminal parameterization CAE model of an inclined crown spring large-current connector, material attribute setting, grid division, contact pair definition, boundary condition and solver configuration are completed through an APDL language; s2, executing transient mechanical field simulation, and extracting normal contact force, geometric deformation and contact area of each contact at the moment when the pin is completely inserted; s3, based on the Hertz contact theory, calculating a contact resistance theoretical value according to the normal contact force of each contact, and deducing the contact conductivity and the contact heat conductivity; and S4, reconstructing a reed geometric model according to a mechanical field deformation result, and fitting the shape of the contact into an ellipse or a circle according to the contact area. The method is used for solving the problem that coupling simulation convergence is difficult due to a complex structure, and the multi-physics field coupling calculation difficulty is reduced.

The invention belongs to the technical field of laser in-situ welding, and discloses a SiC particle reinforced aluminum-based composite material laser in-situ welding and modeling method, and the method comprises the steps: building a laser heat source model considering the surface optical property difference of a particle melt; establishing a multiphase flow model based on magnetohydrodynamics; and a DEM-based particle migration-heat transfer model is developed. A particle contact force and deformation relation is described based on a Hertz contact theory, a contact heat conductivity coefficient of SiC particles is obtained by combining an experimental method, and dynamic tracking of contact and heat transfer is realized by adopting a discrete element DEM method; and molten pool-keyhole-particle multi-energy field multi-phase coupling integrated modeling is carried out. According to the method, the welding heat behavior description is more accurate, the difference of optical behaviors such as laser absorption, scattering and reflection on the surfaces of the fluid and the SiC particles is considered for the first time through the established numerical simulation model, and the characterization of the energy transmission behavior and the temperature evolution behavior in the welding process is more accurate.

The invention belongs to the technical field of semiconductor testing, and discloses a semiconductor device steady-state thermal resistance testing device which comprises a box body, a control device is arranged on one side in the box body, an operation table is arranged on the other side of the box body, a testing plate is arranged on the top of the operation table, and supporting frames are arranged on the two sides of the operation table. A moving structure is arranged in the middle of the supporting frame, a testing sensor is arranged at the bottom of the moving structure, a testing groove is formed in the middle of the testing plate, and a semiconductor device is arranged in the testing groove. A semiconductor device is clamped and fixed through the clamping block and the moving block, meanwhile, the semiconductor device is cleaned through the cleaning structure, dust and impurities are prevented from adhering to the surface, the surface of the semiconductor device is prevented from being uneven, then the surface of the semiconductor device is evenly coated with heat conduction paste through movement of the scraper, gaps are effectively filled, and the heat conduction efficiency is improved. And meanwhile, the heat conduction effect is enhanced, so that contact thermal resistance is prevented from influencing the test effect.

A liquid-cooling heat dissipation device which comprises a cooling plate, a heat dissipator having a working liquid therein, and at least two conduits connecting the cold plate to the heat dissipator is described. A surface of the cooling plate is configured to contact a heat-generating component, thereby transferring the heat generated by the heat-generating component to the cooling plate and conducting the heat away to the heat dissipator via a working liquid.

The invention discloses a method for measuring contact thermal resistance of a thin test piece, and relates to the technical field of thermal resistance testing. A first gel sheet is stacked between a heating rod and a cooling rod, and a temperature sensor is arranged between a thin test piece A, a thin test piece B and the first gel sheet or between the gel sheet and the thin test piece; and calculating the contact thermal resistance between the thin test piece A and the thin test piece B by calculating the total thermal resistance value and subtracting the inherent thermal resistance values of the thin test piece A and the thin test piece B. Compared with a traditional steady-state direct method, a temperature sensor does not need to be inserted into a thin test piece, for the thin test piece which is difficult to connect with the temperature sensor, the TCR measuring process is simpler and more convenient, certain reference significance is achieved for engineering practice, and the adopted gel sheet has constant thermal resistance under vacuum and atmospheric pressure, so that the TCR measuring accuracy is improved. Due to the constant thermal resistance of the gel sheet and the independence of the gel sheet on the contact pressure and the air pressure, the accuracy of a measurement result is realized.