Heat Dissipation Element With Capillary Layer for Condensation Space
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Solution Overview
Problem
Conventional thermosiphon radiators have a liquid phase-change working medium level higher than the heat source interface, occupying condensation space and limiting performance.
Innovation Solution
A heat dissipation element with a capillary layer and steam channel is integrated into the thermosiphon radiator, allowing the liquid phase-change working medium level to be below the heat source interface, utilizing capillary force for heat transfer and expanding condensation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid level of the liquid phase-change working medium is kept higher than the upper interface of the heat source, then the heat source can be fully covered for heat absorption, but the condensation area is occupied and performance is limited
Solution Approach 1:
The heat dissipation element is segmented into distinct functional zones: a heat absorption zone with capillary layer covering the heat source, and a condensation zone above it. This segmentation allows the liquid level to be lower than the heat source interface while maintaining full heat absorption coverage through capillary action, and simultaneously provides dedicated condensation area without overlap.
Solution Approach 2:
A capillary layer with porous structure is introduced in the heat absorption zone. This porous material enables the liquid phase-change working medium to be drawn upward through capillary forces to cover the heat source interface, eliminating the need to raise the liquid level above the heat source. This resolves the contradiction by providing full heat absorption coverage while preserving condensation area.
2Productivity
If the liquid phase-change working medium level is raised to ensure full heat transfer, then heat transfer efficiency is improved, but the condensation space is reduced
Solution Approach 1:
The heat dissipation element divides the working medium distribution into two segments: the capillary layer confines the liquid phase-change working medium to the heat absorption zone, while the condensation zone above remains free for gas phase condensation. This segmentation ensures full heat transfer efficiency through capillary coverage while maintaining adequate condensation space.
Solution Approach 2:
The invention changes the distribution parameter of the liquid phase-change working medium from gravity-dependent (requiring high liquid level) to capillary-force-dependent (confined to porous layer). This parameter change allows the liquid to remain at lower levels while still achieving full heat source coverage, thereby preserving condensation space volume.
3Device complexity
If conventional gravity-based circulation is used, then the structure is simple, but the liquid level must be higher than the heat source interface
Solution Approach 1:
A porous capillary layer is introduced to replace pure gravity-based circulation. The capillary structure passively draws the liquid phase-change working medium upward to cover the heat source interface without requiring the liquid level to be higher than the heat source. This adds minimal structural complexity while significantly reducing the required liquid level height.
Solution Approach 2:
The invention substitutes gravity-based mechanical circulation with capillary force-based circulation. Instead of relying on gravity to pull the liquid up (requiring high liquid level), capillary forces in the porous layer actively draw the liquid upward to cover the heat source. This substitution reduces the liquid level height requirement while adding only a thin capillary layer structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances heat dissipation efficiency by fully utilizing condensation space and reducing the working medium's occupancy, improving the thermosiphon radiator's performance.
Implementation Method 1
The capillary layer is configured to suck the liquid phase-change working medium to perform phase-change heat transfer with the heat source
Implementation Method 2
a liquid level of a liquid phase-change working medium inside the thermosiphon radiator... to allow the heat of the heat source to be fully absorbed through heat transfer of phase change
Implementation Method 3
A phase-change working medium inside a thermosiphon radiator circulates entirely by gravity
Data Source
Figure 1
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AI summary
Disclosed in the embodiments of the present application are a heat dissipation element and a thermosiphon radiator, which are used in the field of electronic heat dissipation. The heat dissipation element comprises a substrate and a cover plate which are connected to each other to form an accommodating cavity, wherein the substrate is provided with a first plate surface and a second plate surface opposite to each other, and the projection of a liquid surface of a liquid phase change working medium accommodated in the accommodating cavity on a plane in the direction of gravity is not higher than the uppermost portion of the projection of a heat source mounted on the second plate surface; and a capillary layer provided in the accommodating cavity, wherein the bottommost portion of the projection of the capillary layer on a plane in the direction of gravity is not higher than the bottommost portion of the projection of the heat source mounted on the second plate surface, and the uppermost portion of the projection of the capillary layer on the plane in the direction of gravity is not lower than the uppermost portion of the projection of the heat source mounted on the second plate surface; the capillary layer is used for sucking up the liquid phase change working medium for phase change heat transfer with the heat source, and the capillary layer is provided with a steam channel, wherein the steam channel allows a gaseous phase change working medium generated by means of phase change to be discharged out of the capillary layer, thereby expanding a condensation space, and improving the performance of the thermosiphon radiator.