12 results about "Nucleate boiling" patented technology

The invention relates to an immersed liquid cooling device and method, and relates to the technical field of thermal management and electronic cooling. Comprising a closed cavity, an electronic element, a phase change material layer and a condensation piece, the closed cavity is filled with dielectric cooling liquid, the phase change material layer is loaded on the surface of the electronic element, and the superheat degree needed by bubble nucleation is remarkably reduced through the combined action of heat absorption and phase change of the phase change layer; a large number of effective nucleation sites are formed on the heating surface, so that bubbles are generated more easily, bubble merging is reduced, and bubble separation and updating are promoted; the phase change material layer maintains more stable nucleate boiling under medium-high heat flow, the porous structure not only can improve the average heat transfer coefficient, but also can absorb cold fluid through the capillary force effect to form heat convection to delay local dry spot formation, higher boiling heat exchange intensity is achieved, and boiling enhancement and heat flux density improvement are achieved.

The application relates to a method and device for determining a thermal margin of a nuclear reactor, a computer device and a medium, and relates to the field of nuclear engineering.The method comprises the following steps: determining a first predicted deviation of bubble nucleate boiling ratio of a to-be-detected reactor, wherein the first predicted deviation of bubble nucleate boiling ratio refers to a minimum predicted deviation of bubble nucleate boiling ratio of the to-be-detected reactor; determining a reactor parameter of the to-be-detected reactor at a predicted time corresponding to the first predicted deviation of bubble nucleate boiling ratio, wherein the reactor parameter comprises an axial power distribution of at least one reactor component in the to-be-detected reactor and a total power of the component, and the total power of the component refers to a sum of the axial power and the radial power of the reactor component; and determining the thermal margin of the to-be-detected reactor according to the reactor parameter.The application can improve the accuracy of the thermal margin of the nuclear reactor, and can more accurately reflect the actual situation of the to-be-detected reactor.

An integrated two-phase immersion cooling system for electronic devices includes a tank containing a dielectric working fluid in which one or more electronic modules are immersed. Each electronic module is thermally coupled to a heat-spreading assembly supporting a boiling-enhancement surface configured to promote controlled nucleate boiling of the dielectric working fluid. Vapor generated at the boiling-enhancement surface rises into a vapor region and is guided toward a condensation assembly, where the vapor is condensed and returned to the working-fluid region through one or more condensate-return pathways. A coolant-delivery subsystem provides directed liquid-phase dielectric working fluid toward the boiling-enhancement surface to reinforce surface wetting, regulate local heat flux, and reduce reliance on bulk fluid circulation. A control subsystem receives thermal and fluidic telemetry, estimates operating states associated with phase-change behavior, and regulates liquid delivery, circulation, and condensation operation to maintain stable two-phase cooling while reducing energy consumption across operating conditions.

This application relates to a method, apparatus, computer equipment, storage medium, and computer program product for analyzing the heat and mass transfer of corrosion products in nuclear reactors. It includes: obtaining the average thermal conductivity of the corrosion products and determining the temperature distribution of the corrosion products in coolant saturation, nucleation boiling, and evaporation states based on the average thermal conductivity; determining the coolant flow rate distribution in the corrosion products based on the pressure distribution; obtaining the concentration relationship between the boric acid concentration and the concentrations of other soluble substances in the coolant, and determining the concentration distribution of other soluble substances based on the concentration relationship and the boric acid concentration; analyzing the internal heat and mass transfer of the corrosion products based on the temperature distribution, flow rate distribution, and concentration distribution of soluble substances to obtain the concentration of boron enriched within the corrosion products, and obtaining the total boron deposition based on the enriched concentration. This method can accurately analyze the heat and mass transfer of corrosion products in nuclear reactors.

The invention relates to the field of heat dissipation devices, and provides a phase change heat dissipation device. The phase change heat dissipation device comprises a sealed cavity, and the sealed cavity is provided with a heat transfer face used for making contact with a heat source, a working medium inlet and a working medium outlet. The macroscopic turbulent flow structure is arranged in the sealing cavity and is used for generating a transverse velocity component and a secondary flow in a working medium flowing through the sealing cavity so as to damage and reconstruct a near-wall boundary layer; and the microscopic nucleation structure is arranged on the heat transfer surface or the surface of the macroscopic turbulent flow structure and is used for providing bubble nucleation points. The phase change heat dissipation device can accelerate heat transfer, start nucleate boiling in advance, effectively meet the requirement for high-heat-flux heat dissipation and solve the problem that a traditional device is low in heat exchange efficiency. The limitation that a traditional phase change heat dissipation device is prone to failure under the high heat flux density is broken through, and the application range is expanded.

Provided is a cooler and a cooling device capable of inducing boiling at a low degree of superheat by suppressing an increase in the Onset of Nucleate Boiling. A cooler of a boiling method type for cooling a heat generating body, comprising: a container for storing a working fluid; a cooling member made of a porous body and disposed in the container so as to face a surface of the heat generating body; and at least one thin metal wire or thin metal film disposed between the surface of the heat generating body and the cooling member and configured to be heatable.

The invention discloses a spraying enhanced two-phase evaporation type flat plate loop heat pipe evaporator and a heat dissipation system, and relates to the technical field of heat management of high-heat-flux electronic devices. The evaporator comprises an evaporator base plate, wherein a liquid gathering groove and a steam groove network are arranged on the evaporator base plate; a double-layer capillary core consisting of a fine-hole capillary core and a coarse-hole distribution layer, a liquid baffle with uniformly distributed through holes and an upper cover plate are sequentially covered above the liquid gathering groove and are jointly closed to form a steam cavity, an active spraying device is arranged, condensate is actively sprayed to the area of the liquid gathering groove, and a stable liquid film is formed through the distribution of the double-layer capillary core; steam generated by boiling is guided to a single-end steam confluence area through a steam groove network in a low-resistance mode, and gas-liquid isolation is achieved through a liquid baffle to prevent high-speed steam entrainment. According to the invention, the evaporation area stably maintains the rich liquid nucleate boiling state, the capillary core drying is effectively inhibited, the stable heat dissipation of the extremely high heat flux of over 300W / cm is realized, and the method is suitable for the heat management of high-power chips such as a GPU (Graphic Processing Unit), an AI (Artificial Intelligence) accelerator and the like.

The present application relates to the field of special glass processing, and discloses a heat-resistant and heat-insulating tempered coated glass and a preparation process thereof, which comprises the following steps: radiating a glass substrate to a preset temperature; spraying a gas-liquid multiphase medium containing a gas-phase precursor and a liquid coolant; using a velocity slip field in a jet field to drive the precursor to contact the glass surface first, and in-situ inducing thermal decomposition to generate nanocrystal nuclei; penetrating the vapor film generated by the liquid coolant through the crystal nuclei to trigger the heat exchange mode to cross from film boiling to nucleate boiling, and forming a compressive stress layer; using thermophoretic force to drive the deposition components to diffuse to the glass surface layer to build a component gradient layer, the present application breaks through the interface thermal resistance bottleneck through an in-situ nucleation mechanism, improves the quenching heat exchange intensity, solves the stress relaxation and film layer peeling problems caused by the step-by-step process, realizes the chemical bonding of the film layer and the substrate, and synergistically enhances the mechanical strength and heat shielding performance of the glass.

To provide a method for determining a cooling condition of a material to be cooled capable of separately adjusting cooling of a film boiling region and cooling of a nucleate boiling region while coping with a rapid change of a heat transfer coefficient in a transition boiling region, and improving flexibility.SOLUTION: A n (T) represents a heat-transfer coefficient α (W / (m2K)) when the surface temperature T (°C) of the cooled material is in a nucleate boiling region; The heat-transfer coefficient α is expressed by an equation including (1-Pc)·α n (T) + Pc·α f (T), where α f (T) represents the heat-transfer coefficient α when the surface temperature T is in the film boiling region, and Pc represents the heat-transfer coefficient α that approaches 0 as the surface temperature T decreases and approaches 1 as the surface temperature T increases at least when the surface temperature T is in the transition boiling region.SELECTED DRAWING: Figure 1

This invention discloses a two-phase immersion liquid-cooled finned grooved chip heat dissipation control system based on thermal management, relating to the field of chip heat dissipation technology. It includes: a data-driven sensing module for real-time acquisition of heat dissipation status monitoring data, data preprocessing, and determination of bubble retention degree, implementing graded vibration and cooling regulation; a heat flux diagnosis and control generation module for constructing a coupled heat flux acoustic digital twin model, assessing the intensity of thermal risk control, and determining the vibration regulation level; a vibration regulation execution module for implementing vibration debubbling at different vibration regulation levels for active heat dissipation control; and a feedback and parameter optimization module for evaluating the vibration regulation effect based on heat dissipation status monitoring data before and after vibration regulation, and performing vibration regulation feedback and optimization. This solves the problem that under high heat flux density conditions, the accumulation of small bubbles on the chip surface makes it difficult to maintain an efficient and stable nucleate boiling state, thus affecting the chip's cooling effect and operational safety.

The application provides a nucleate boiling device and a processing method of the nucleate boiling device. A wall surface of a cavity of the boiling device is provided with a bubble cavity, and roughness of the wall surface is less than or equal to Ra0.05. In this way, by reducing the roughness of the wall surface and by the arrangement of the bubble cavity, the wall surface is smooth enough, so that the generation of bubbles is avoided in places other than the bubble cavity, and the growth position of the bubbles is guided to the bubble cavity for growth, so that the position of the bubbles is determined, and the accuracy of observation and analysis of the bubbles is improved.