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A study on thermal conductivity of a mixture of magnesia particles and molten nitrate by a transient hot wire method

✍ Scribed by Kazuyuki Kitano; Katsuya Hanyuda; Eisyun Takegoshi; Masatoshi Sawada; Yoshio Hirasawa; Akio Kosaka

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
447 KB
Volume
35
Category
Article
ISSN
1099-2871

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✦ Synopsis

Abstract

In this study, the effective thermal conductivity of a mixture of magnesia particles and molten nitrate used in a high temperature thermal energy storage system was investigated by a transient hot wire method. The effective thermal conductivity of the mixture was around 2.0W/(mΒ·K) in the temperature range of 423 K to 703 K, although it decreased about 5% with increasing temperature. This value was about 10 times larger than that of the packed bed of magnesia particles including air. The effective thermal conductivity increased about 3% with a 1% increase in the volume ratio of magnesia particles in the mixture with molten nitrate. Β© 2006 Wiley Periodicals, Inc. Heat Trans Asian Res, 35(4): 245–253, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/htj.20116

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## Abstract A transient short‐hot‐wire method has been proposed to simultaneously measure the thermal conductivity and thermal diffusivity of liquids. The method has been applied to the refrigerant HCFC‐22, alternative refrigerants HFC‐32, HFC‐125, HFC‐134a and refrigerant mixtures HFC‐32/125 [35/6