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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

VISUALIZATION FOR HEAT PIPE EVAPORATOR OF NANOPARTICLE- LADEN MESH WICK WITH WATER, METHANOL OR ACETONE

DOI: 10.1615/TFESC1.mph.012806
pages 2023-2029

Shwin-Chung Wong
Department of Power Mechanical Engineering, National Tsing Hua University Hsin-Chu, Taiwan, ROC

Ya-Chi Ho
Department of Power Mechanical Engineering, National Tsing Hua University Hsin-Chu, Taiwan, ROC


KEY WORDS: Heat pipe, Nanofluid, Evaporator resistance

Abstract

Visualization experiments are conducted on horizontal heat pipes to investigate the effects of Al2O3 or Cu nanoparticles laden in mesh-wick evaporator. The weight of both kinds of nanoparticles is 0.01g, with Cu nanoparticles sintered and Al2O3 nanoparticles sedimented in the evaporator. Three different working fluids are tested and compared under similar conditions. According to the present results, the effect of nanoparticles the maximum heat load Qmax is insignificant. Boiling is not observed for water with or without nanoparticles. For methanol and acetone, weak boiling occurs without nanoparticles, leading to improved minimum evaporator resistance Re,min. With these nanoparticles, the boiling seemed either slightly enhanced, unaffected, or even suppressed in different cases. Overall, the sedimented nanoparticles provide insignificant effects to the boiling behavior and the performance of a mesh-wick evaporator.

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