Experimental and modeling study on adiabatic two-phase expansion in a cylinder

Hiroshi Kanno*, Naoki Shikazono


研究成果: Article査読

11 被引用数 (Scopus)


In the present study, visualization and measurement of two-phase adiabatic expansion in a cylinder with moving piston are carried out. Experimental setup with piston and cylinder which mimics reciprocating expander was constructed and boiling phenomenon is visualized. The difference between measured and quasi-static pressures becomes larger as piston velocity is increased. With the decrease of piston diameter, agitation of the liquid phase becomes stronger and adiabatic efficiency becomes closer to that of the quasi-static state. The adiabatic efficiency is almost independent on the initial fluid temperature. Finally, a model to predict pressure change in two-phase expansion process is proposed and the model can predict adiabatic efficiency within the range of about ±2.5% accuracy. From the model prediction, it is shown that the uniformity of the liquid phase temperature distribution is the key factor for improving the adiabatic efficiency.

ジャーナルInternational Journal of Heat and Mass Transfer
出版ステータスPublished - 2015 7月 1

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学
  • 流体および伝熱


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