1021 微小重力実験用小型二相流体ループの開発における問題点について

概要

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To clarify the mechanisms of boiling heat transfer and two-phase flow under microgravity conditions, the development of a compact two-phase flow loop, which meets the requirement for NASDA FPEF (Fluid Physics Experiment Facility) in ISS (International Space Station), is attempted. The present paper describes the expected problems in the design of the loop and its components under the restrictions inherent in the facility. Flow boiling experiments in tubes and in a duct with a large cross section are planned, and the latter allows the phenomena near pool boiling if mass velocity is very small. To observe behaviors of microlayer underneath an attached bubble, which gives information about the mechanisms of nucleate boiling heat transfer, the development of a new heating surface is planned to control locally the heating conditions and to measure local heat transfer characteristics by using thin micro-heaters coated directly on a transparent surface. To reduce the electric power supply, heat recovery system is to be introduced in the test loop, where a part of heat removed from a condenser is supplied to preheaters requiring large power to realize prescribed qualities in the tube test sections. Since the restriction of volume is one of serious problems preventing the use of long heated tubes, the validity of a short tube for the measurement of two-phase forced convective heat transfer is investigated.
社団法人日本機械学会の論文
2002-09-20