Study of Cold Heat Energy Release Characteristics of Flowing Ice Water Slurry in a Pipe

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  • INABA Hideo
    Department of Mechanical Engineering, Faculty of Engineering, Okayama University
  • HORIBE Akihiko
    Department of Mechanical Engineering, Faculty of Engineering, Okayama University
  • OZAKI Koichi
    Department of Mechanical Engineering, Faculty of Engineering, Okayama University
  • YOKOTA Maki
    Graduate School, Okayama University

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  • 管内流動氷水スラリーの採冷熱特性に関する研究
  • カンナイ リュウドウ コオリミズ スラリー ノ サイレイネツ トクセイ ニカン

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Abstract

This paper has dealt with melting heat transfer characteristics of ice water slurry in an inside tube of horizontal double tube heat exchanger in which a hot water circulated in an annular gap between the inside and outside tubes. Two kinds of heat exchangers were used; one is made of acrylic resin tube for flow visualization and the other is made of stainless steel tube for melting heat transfer measurement. The result of flow visualization revealed that ice particles flowed along the top of inside tube in the ranges of small ice packing factor and low ice water slurry velocity, while ice particles diffused into the whole of tube and flowed like a plug built up by ice particles for large ice packing factor and high velocity. Moreover, it was found that the flowing ice plug was separated into numbers of small ice clusters by melting phenomenon. Experiments of melting heat transfer were carried out under some parameters of ice packing factor, ice water slurry flow rate and hot water temperature. Consequently, the correlation equation of melting heat transfer was derived as a function of those experimental parameters.

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