Heat Transfer Characteristics in a Two-Phase Crank-Shape Closed Thermosyphon

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  • IMURA Hideaki
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto University
  • KOITO Yasuhi
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto University

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Other Title
  • クランク形状をした二相密閉型熱サイフォン内の熱伝達特性
  • クランク形状をした二相密閉型熱サイフォン内の熱伝達特性--オフセット長さの影響
  • クランク ケイジョウ オ シタ 2ソウ ミッペイガタ ネツ サイフォン ナイ ノ ネツ デンタツ トクセイ オフセット ナガサ ノ エイキョウ
  • - オフセット長さの影響 -
  • -The Effect of Offset Length -

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Description

This paper describes the heat transfer characteristics in a two-phase crank-shape closed thermosyphon. Usually, the thermosyphon is composed of an evaporator, an adiabatic section and a condenser arranged on a straight tube. However, a bent geometry of the thermosyphon is sometimes needed to use because of the limited space for the straight thermosyphon to be installed. Therefore, in the present study, the crank-shape thermosyphon is investigated on the heat transfer coefficients and the critical heat fluxes. The evaporator and the condenser are positioned vertically and the adiabatic section horizontally. The inside diameter of thermosyphon is 16 mm and each length of the evaporator and condenser is 500 mm. As a working fluid, water is used. The inside temperature (the adiabatic wall temperature) is varied from 40 to 80 °C. The distance between the centers of the vertical evaporator and condenser, i. e. , the offset length is varied from 220 to 620 mm, and the effect of the offset length on the heat transfer characteristics is presented.

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