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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Microscopic film collapse behavior at trigger for vapor explosion

Yutaka Abe
University of Tsukuba, Graduate School of System and Information Engineering, 1-1-1, Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan

Hideki Nariai
Institute of Engineering Mechanics and Systems, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan

Abstract

In the present study, the vapor film collapse behavior around high temperature solid particle submerged into water was experimentally investigated by applying a pressure pulse to the vapor film on a high temperature sold particle. Microscopic interfacial phenomena between vapor and water were visually observed by using a high-speed video camera. The visual data obtained were processed by visual data processing techniques. Furthermore, the transients of the temperature and pressure were simultaneously measured. The interfacial temperature is estimated by solving the heat conduction equation with the data obtained as the boundary conditions.
It is clarified that vapor collapse by pressure pulse occurs homogeneously around the vapor film surface on a high temperature particle. Microscopic information is obtained from the visual data by using visual data processing technique, PIV technique and digital auto-correlation technique. At the time the vapor film surface changes to white, the saturation temperature exceeds the interfacial temperature. The microscopic vapor film collapse behavior indicates the possibility of the phase change at the vapor film collapse.

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