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research-article

Investigation of the Use of an Inorganic Aqueous Solution (IAS) in Aluminum Made Phase Change Heat Transfer Devices

[+] Author and Article Information
Qi Yao

University of California, Los Angeles 420 Westwood Plaza, Eng. IV 43-132 Los Angeles, CA 90095-1957
yaoqi1983@ucla.edu

Michael J. Stubblebine

University of California, Los Angeles 420 Westwood Plaza, Eng. IV 43-132 Los Angeles, CA 90095-1957
mike.stubblebine@gmail.com

Ivan Catton

University of California, Los Angeles 420 Westwood Plaza, Eng. IV 43-132 Los Angeles, CA 90095-1957
catton@ucla.edu

1Corresponding author.

ASME doi:10.1115/1.4037079 History: Received August 17, 2016; Revised June 05, 2017

Abstract

An Inorganic Aqueous Solution, known as IAS, has shown its compatibility with aluminum phase change heat transfer devices. When using IAS in aluminum devices, aluminum prefers to react with the two oxidizers, permanganate and chromate, rather than water to generate a thin and compact layer of aluminum oxide, which protects the aluminum surface and prevents further reactions. In addition, an electrochemical theory of aluminum passivation is introduced, and the existence of an electrochemical cycle is demonstrated by an aluminum thermo-syphon test. The electrochemistry cycle, built up by liquid back flow and tube wall, allows the oxidizers to passivate the aluminum surface inside the device without being directly in contact with it. However, failure was detected while using IAS in thermo-syphons with air natural convection cooling. The importance of a continuous liquid back flow to aluminum passivation in phase change heat transfer devices is pointed out, and a vertical thermo-syphon test with natural convection cooling is used to demonstrate that a discontinuous liquid back flow is the main reason of the failures.

Copyright (c) 2017 by ASME
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