The Proceedings of Mechanical Engineering Congress, Japan
Online ISSN : 2424-2667
ISSN-L : 2424-2667
2023
Session ID : S081-09
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Improvements of thermal performance by nanoparticle layer in heat pipes
*Menglei WANGYifan LIUTomio OKAWA
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Abstract

In order to improve the heat transfer performance of a heat pipe, the screen mesh wick contained in the copper tube container was pre-coated with a silica nanoparticle layer to enhance its capillarity. Pure water was used as the working fluid. In the experiment, the one end of the heat pipe was heated using a nichrome wire heater and the other end was cooled with saturated pool boiling of water. The experimental results showed that in comparison with the normal heat pipe, the thermal resistance decreased up to 46% and the maximum heat transfer rate increased up to 1.5 times if the amount of deposited nanoparticles was sufficient. The hysteresis after the MHTR condition was reached disappeared. The thermal performance was not deteriorated even after the maximum heat transfer rate condition was experienced. It was confirmed that the improvements of the heat transfer performances can mainly be attributed to the high water absorption property of the nanoparticle layer.

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© 2023 The Japan Society of Mechanical Engineers
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