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Visualization Experimental Study on Silicon-Based Ultra-Thin Loop Heat Pipe Using Deionized Water as Working Fluid.

Wenzhe Song¹, Yanfeng Xu¹, Lihong Xue¹

¹School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai 264209, China.

|September 28, 2021

Summary

This study visually investigates silicon-based ultra-thin loop heat pipes (s-UTLHPs) for high heat flux dissipation in confined spaces. The research demonstrates their feasibility and analyzes operational phenomena, offering insights for future micro-scale thermal management applications.

Keywords:

deionized water heat transfer experiment loop heat pipe two-phase flow visualization

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Area of Science:

Materials Science
Thermal Engineering
Microfluidics

Background:

Micro-scale heat dissipation is critical in modern electronics.
Silicon-based ultra-thin loop heat pipes (s-UTLHPs) offer potential for high heat flux management.
Visualizing heat transfer mechanisms in s-UTLHPs is essential for performance optimization.

Purpose of the Study:

To demonstrate the feasibility of s-UTLHPs for high heat flux applications in narrow spaces.
To visually study the heat transfer mechanisms of s-UTLHPs during operation.
To analyze failure modes and propose solutions for s-UTLHPs.

Main Methods:

Proposed a structural design for s-UTLHPs.
Developed an experimental system for visual observation, including holding, heating, cooling, data acquisition, and vacuum modules.
Utilized deionized water as the working fluid for experiments.

Main Results:

Observed and analyzed s-UTLHP phenomena during startup, including overall and micro-scale behaviors.
Investigated evaporation and condensation processes during stable s-UTLHP operation.
Identified failure phenomena and proposed corrective solutions.

Conclusions:

Confirmed the feasibility of s-UTLHPs for high heat flux dissipation in confined environments.
Provided visual insights into the operational dynamics of s-UTLHPs.
Experimental findings serve as a reference for future research and development in micro heat pipes.