Heat rejecting capability of a two-phase loop cold plate for space use.

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  • 宇宙用二相流体ループ蒸発器の熱輸送特性

Abstract

This paper deals with a fundamental approach for a two-phase fluid loop system, with emphasis specifically on the discussion of its most important section, i. e. the evaporator or cold plate. As a basis of the study, a mathematical model was introduced which represents a simplified thermal configuration of the cold plate section. And numerical investigation was conducted to examine its heat rejection capability with respect to several parameters which will affect to the thermo-fluid characters of this section, such as fluid mass flow rate, quality, temperature difference, tube dimensions of the cold plate, and others. Some qualitative features have been obtained, although mathematical formulations employed in the model are derived from those developed for terrestrial use with neglecting the gravity effect in the equations. One major finding in this study is that there exist critical limits of working condition of the cold plate, indicating the practical restrictions between the parameters outside of which no stable heat rejecting performance will be realized.

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