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3.1 Dryout Phenomena in Two-Phase Shear Flow

DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf.270
pages 487-498

Shigeyasu Nakanishi
Department of Mechanical Engineering, Faculty of Engineering, Osaka University, Yamada-kami, Suita, 565, Japan; Department of Chemical Engineering, Faculty of Engineering, Himeji Institute of Technology, 2167 Shosha, Himeji, Hyogo 671-22, JAPAN

Mamoru Ozawa
Department of Safety Science, Kansai University, 7-1 Hakubai-cho, Takatsuki-shi, Osaka 569-1098, Japan

Seikan Ishigai
Department of Mechanical Engineering, Faculty of Engineering, Osaka University, Yamada-kami, Suita, 565, Japan

Eiichi Miwa
Department of Mechanical Engineering, Faculty of Engineering, Osaka University, Yamada-kami, Suita, 565, Japan

Abstract

To elucidate the fluctuation mechanism of the dryout position in evaporating tubes, a photographic study of the dryout phenomena in two-phase shear flow is conducted using Freon-113. Dryout patterns observed are classified into three types; dry-patch type, disturbance wave type, and rivulet type. The threshold conditions for these three types are determined for several heat fluxes. The influences of the disturbance wave are analysed by the cine-film method.

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