Vapor Chamber Segmented Flow Path for Heat Dissipation
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Solution Overview
Problem
Vapor chambers with traditional wick configurations face limitations in holding sufficient working fluid and achieving high heat transportation capacity, as they either reduce fluid holding capacity or narrow vapor flow paths, compromising capillary force and overall heat dissipation efficiency.
Innovation Solution
A vapor chamber design featuring a housing composed of two sheets facing each other with projecting portions on the inner surface, creating a larger second flow path in the terminal region, which enhances fluid holding and heat transportation capacity by increasing the cross-sectional area of the second flow path compared to the first flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the wick is located at the center between the upper plate member and the lower plate member, then the water retention amount is increased, but the vapor flow path becomes narrow and the capillary force is less likely to act in the holding portion, resulting in inferior heat transportation capacity
Solution Approach 1:
The internal space is divided into a holding portion (with larger cross-sectional area for fluid storage) and a vapor flow path region (with narrower cross-sectional area for efficient vapor transport). This segmentation allows the wick to be positioned in the holding portion where it can retain sufficient working fluid while the vapor flow path remains open and unobstructed, resolving the contradiction between fluid retention and heat transportation capacity.
2Device complexity
If the wick makes contact with the lower plate member, then the structure is simplified, but the holding amount of the working fluid is reduced and heat transportation capacity is inferior
Solution Approach 1:
The wick is extended in the thickness direction (vertical dimension) so that it protrudes from the lower plate member into the internal space. This dimensional extension allows the wick to contact both the lower plate member (maintaining structural simplicity) and extend into the holding portion (increasing working fluid retention capacity), thereby improving heat transportation capacity without significantly increasing structural complexity.
3Productivity
If the cross-sectional area of the vapor flow path is increased, then the heat transportation capacity is improved, but the holding amount of working fluid is reduced
Solution Approach 1:
The internal space is segmented into distinct functional regions: a holding portion with larger cross-sectional area dedicated to working fluid storage, and a vapor flow path region with optimized narrower cross-sectional area for efficient vapor transport. This spatial segmentation allows each region to be optimized for its specific function, ensuring sufficient fluid holding capacity while maintaining high heat transportation capacity through an unobstructed vapor flow path.
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
This design allows for a substantial increase in working fluid holding capacity and heat transportation efficiency, enabling effective heat dissipation without external power, suitable for miniaturized electronic devices.
Implementation Method 1
a wick for transporting a working fluid by capillary force
Implementation Method 2
The working fluid absorbs heat from a heat generation element in an evaporation portion which absorbs heat from the heat generation element, evaporates in the vapor chamber
Implementation Method 3
By repeating this operation, the vapor chamber can operate autonomously without having external power and can diffuse heat two dimensionally at high speed by utilizing evaporation latent heat and condensation latent heat of the working liquid
Implementation Method 4
moves to a condensation portion, and is cooled to return to a liquid phase
Implementation Method 5
By repeating this operation, the vapor chamber can operate autonomously without having external power and can diffuse heat two dimensionally at high speed by utilizing evaporation latent heat and condensation latent heat of the working liquid
Data Source
AI summary
A vapor chamber that includes a housing composed of a first sheet and a second sheet facing each other and having outer edge portions thereof joined to each other to define an internal space, the second sheet having a plurality of projecting portions on an inner surface thereof that faces the internal space; a pillar between the first sheet and the second sheet and supporting them from the internal space; a wick arranged in the housing, and a working fluid enclosed in the housing. A first flow path and a second flow path are formed in the internal space, and a cross-sectional area of the second flow path is larger than a cross-sectional area of the first flow path.