Variable-Permeability Wick Structure for Heat Pipe Capillary Limits
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Solution Overview
Problem
Current heat pipes with uniform wick structures face limitations in efficiently managing the capillary action of working fluids, leading to suboptimal heat transfer performance.
Innovation Solution
The development of heat pipes with wick structures that feature multiple regions with varying pore sizes and permeabilities, allowing for graded capillary action from the evaporator to the condenser region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform wick structure is used throughout the heat pipe, then the manufacturing process is simple and the structure is easy to produce, but the capillary action efficiency is suboptimal and heat transfer performance is limited
Solution Approach 1:
The wick structure is divided into multiple regions along the heat pipe length, with each region having different pore sizes and permeability characteristics. The first region (near evaporator) has smaller pores for strong capillary action, while the second region (near condenser) has larger pores for efficient fluid return, optimizing heat transfer at different locations
Solution Approach 2:
The wick structure is segmented into distinct regions with varying properties rather than being uniform. This segmentation allows different portions of the wick to perform specialized functions: the first region provides capillary pumping while the second region facilitates fluid return, improving overall system performance
2Productivity
If the pore size varies throughout the wick structure, then the capillary limit and heat transfer performance are enhanced, but the manufacturing complexity and wick structure design difficulty increase
Solution Approach 1:
The pore size parameter is systematically varied along the length of the heat pipe. The first region has a first pore size optimized for capillary action, while the second region has a second pore size optimized for fluid return, creating a gradient that enhances overall heat transfer efficiency
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 enhances the capillary limit and overall performance of heat pipes, enabling more efficient heat transfer and improved pumping capacity compared to traditional uniform wick structures.
Implementation Method 1
heat pipes having wick structures that facilitate capillary action of working fluid within the heat pipes
Implementation Method 2
Heat pipes use evaporation and condensation cycles of working fluid to move heat
Implementation Method 3
Heat pipes use evaporation and condensation cycles of working fluid to move heat
Data Source
AI summary
A heat pipe is provided having a hollow body defining an interior vapor space, evaporator and condenser regions, a wick structure lining an inner wall of the hollow body, and a working fluid disposed in the hollow body, wherein a path for the working fluid in liquid state extends from the condenser region toward the evaporator region or wherein the wick structure extends along a direction from a first end of the hollow body toward the second end, and wherein the wick structure includes first and second regions that extend along the path or direction and that each have wick particles defining respective pore sizes that are different from one another.