Heat Transfer Enhancement in Gravity Heat Pipes Using AAO Nanostructure Generated on Condenser Section Inner Surface

Chun-Ching Kuo,Huei Chu Weng

doi:10.3390/pr9101827

Abstract

This study mainly focuses on the influence of anodic aluminum oxide (AAO) nanostructure generated on condenser section inner surface on the heat transfer performance of gravity heat pipes. AAO nanotubes were first grown by anodizing the inner wall surface of the condenser section of aluminum alloy gravity heat pipes through different anodizing voltages and treatment times. The nanostructure effect on the temperature distribution and overall thermal resistance was then investigated by using a thermal performance test system under different input heat powers. The experimental results showed that the generation of AAO nanostructure on the inner surface significantly enhances heat transfer performance; that is, the temperature difference between the evaporator and condenser sections and overall thermal resistance are reduced. Such an effect can be more significant in the case of a lower heat source. The percentage decreases in temperature difference and overall thermal resistance can be reduced by up to 58.83% and 58.79%, respectively, compared to the unprocessed heat pipe.

Highlights

Processes 2021, 9, 1827. https://With the rapid development of information technology and electronic industry, most electronic devices and components generate more and more waste heat when performing a large number of calculations
T3), and T e is the average of the three temperatures obtained in the evaporation the focus is on the temperature distribution and overall thermal resistance under different anodizing voltages (20 V to 50 V) and treatment times (3 h to 9 h), which represent different anodic aluminum oxide (AAO) nanostructured condenser section inner surfaces
The highest power (100 W) is mainly used as a case to show the influence of AAO nanostructure generated on condenser section inner surface on the heat transfer performance of gravity heat pipes

Summary

Introduction

Processes 2021, 9, 1827. https://With the rapid development of information technology and electronic industry, most electronic devices and components generate more and more waste heat when performing a large number of calculations. Among the many heat transfer solutions used in the information technology and electronic industry, the use of heat pipes is one of the most effective heat transfer solutions known to people, which has the advantages of fast thermal response, simple structure, light weight, and high reliability. The studies on improving the overall heat transfer performance of gravity heat pipes mainly focused on changing heat pipe inclination angle and filling different working fluids. Solomon et al [2] conducted experiments to investigate the performance enhancement of a gravity heat pipe with a thin, porous copper coating under different inclination angles. The experimental results revealed that at any inclination angle, the heat transfer performance can be improved by the thin, porous copper coating

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Conclusion