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HEAT TRANSFER AND FLOW CHARACTERISTICS OF SUPERSONIC STEAM INJECTOR

DOI: 10.1615/IHTC13.p22.440
page 11

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

Y. Kawamoto
University of Tsukuba, Tennoudai, Tsukuba, Ibaraki, Japan

C. Iwaki
Toshiba Corporation, Kawasaki, Kanagawa, Japan

T. Narabayashi
Toshiba Corporation, Kawasaki, Kanagawa; and Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Japan

Michitsugu Mori
Tokyo Electric Power Company, Yokohama, Kanagawa, Japan

S. Ohmori
Tokyo Electric Power Company, Yokohama, Kanagawa, Japan

Abstract

One of the innovative technologies is the supersonic steam injector, which has been investigated as one of the most important component of the next-generation nuclear reactor. The steam injector has functions of a passive pump without large motor or turbo-machinery and a high efficiency heat exchanger. The performances of the supersonic steam injector as a pump and heat exchanger are dependent on direct contact condensation phenomena between a supersonic steam and a sub cooled water jet. The present study, visible transparent supersonic steam injector with axial and vertical temperature and velocity measurement instrumentations is used to obtain the spatial temperature and velocity distribution in the supersonic steam injector, as well as high speed visual observation of water jet and steam interface. The experiments are conducted with and without non-condensable gas. From the observation results, it is supposed that the water jet surface fluctuation exists and an entrainment is occurred on the water jet surface. And the radial temperature and the velocity distributions show that the temperature and the velocity in the water jet are mostly symmetrical and higher at the downstream. Furthermore it is supposed that the non-condensable gas affects the condensation between the water jet surface and the steam and eventually decrease the temperature and the velocity increase rate of the water jet.

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Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION