2013 Fiscal Year Final Research Report

Dryout mechanism of thin liquid film near a flow obstacle using substitute fluids which simulates the high pressure and temperature conditions

Research Project

Project/Area Number	23760148
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Fluid engineering
Research Institution	Yokohama National University
Principal Investigator	MORI Shoji 横浜国立大学, 工学研究院, 准教授 (10377088)
Project Period (FY)	2011 – 2013
Keywords	混相流 / 液膜流 / 環状流 / じょう乱波 / 限界熱流束
Research Abstract	Gas-liquid two-phase flow is encountered in many industries, including flow near nuclear fuel rods in boiling water reactor(BWR). Especially dryout of water film occurs at the thin base film between two successive disturbance waves. Therefore, it is important to clarify the detailed behavior of the disturbance wave. In previous studies, many experiments were performed under atmospheric condition. However the properties of liquid and gas under atmospheric condition are quite different from those of a BWR operating condition(7MPa, 285C). Therefore, in the present study, HFC134a gas and ethanol liquid, whose properties are similar to those the BWR operating conditions are used as the test fluids at comparatively low pressure and low temperature (0.7MPa,40C). In this paper, the influence of gas-liquid properties on the liquid film thickness is reported.

(3 results)