Wick Sheet Vapor Flow Channels for Heat Dissipation
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Solution Overview
Problem
Existing vapor chambers face challenges in achieving high heat dissipation efficiency due to limitations in the design of the wick structure, which affects the flow and phase change of the working fluid, leading to inefficient heat transfer.
Innovation Solution
A wick sheet for vapor chambers with a specific design featuring a sheet body with vapor and liquid flow channels, including land portions, vapor flow channel grooves, and communication grooves, which enhance the flow and phase change efficiency of the working fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional wick structure is used in the vapor chamber, then the structure is simple and easy to manufacture, but the heat dissipation efficiency is insufficient due to poor vapor diffusion and liquid flow
Solution Approach 1:
The wick structure is segmented into distinct functional zones: a first wick region with first liquid flow channels and a second wick region with second liquid flow channels. This segmentation allows optimization of liquid flow paths in different regions, improving overall heat dissipation efficiency while maintaining manageable structural complexity through modular design
Solution Approach 2:
Different regions of the wick are given different local characteristics: the first wick region has specific flow channel configurations optimized for certain flow patterns, while the second wick region has different configurations for complementary flow patterns. This local quality differentiation enhances heat dissipation efficiency without requiring complete redesign of the entire structure
2Productivity
If the vapor flow channels are not optimized, then the manufacturing process is simpler, but the vapor diffusion efficiency is poor leading to reduced heat transfer performance
Solution Approach 1:
The vapor flow channels are designed to extend in multiple dimensions within the vapor chamber, creating three-dimensional vapor diffusion paths. This dimensional expansion allows vapor to diffuse more efficiently through the chamber while the channels are formed using standard manufacturing techniques, balancing enhanced performance with manufacturing feasibility
3Reliability
If the liquid flow channels are not properly designed, then the structure remains simple, but the working fluid cannot effectively reflux from condensation region to evaporation region
Solution Approach 1:
The liquid flow channels are designed to utilize capillary action and pressure differentials created during normal operation to automatically reflux working fluid from the condensation region back to the evaporation region. This self-service mechanism ensures reliable fluid circulation without requiring external pumps or complex control systems, maintaining structural simplicity while achieving high reliability
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
The improved wick sheet design enhances the heat dissipation efficiency by facilitating the smooth diffusion and condensation of vapor, thereby effectively cooling electronic devices.
Implementation Method 1
The working liquid in the vapor chamber receives heat from an electronic device at a portion (an evaporation portion) of the vapor chamber in the vicinity of the electronic device. In this manner, the working fluid evaporates and turns into working vapor.
Implementation Method 2
The working vapor is diffused in a vapor flow channel portion formed in the vapor chamber in a direction away from the evaporation portion and, thus, is cooled. Then, the working vapor condenses and turns into working liquid.
Implementation Method 3
The vapor chamber includes a liquid flow channel portion functioning as a capillary structure (also referred to as a 'wick'). Accordingly, the working fluid enters the liquid flow channel portion from the vapor flow channel portion. Thereafter, the working liquid flows through the liquid flow channel portion and is delivered toward the evaporation portion.
Data Source
AI summary
A wick sheet for a vapor chamber includes a sheet body having a first body surface and a second body surface, a first vapor flow channel portion, a liquid flow channel portion provided on the second body surface, and the second vapor flow channel portion provided on the first body surface. The sheet body includes a land portion having the longitudinal direction being a first direction, and the first vapor flow channel portion is disposed around the land portion. The second vapor flow channel portion includes a vapor flow channel groove extending from one of side edges of the land portion to the other side edge in a second direction orthogonal to the first direction.