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International Heat Transfer Conference 8

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

BOILING TRANSITION AND THE POSSIBILITY OF SPONTANEOUS NUCLEATION UNDER HIGH SUBCOOLING AND HIGH MASS FLUX DENSITY FLOW IN A TUBE

Yoshitaka Fukuyama
Power and Industrial Systems R&D Center, Power Systems & Services Company, Toshiba Corporation, 2-4, Suehiro-Cho, Tsurumi-Ku, Yokohama 230-0045, Japan

T. Kuriyama
Eng. Sci. and Tech. Lab., Toshiba Corporation, Kanagawa, 210 Japan

Masaru Hirata
Dept. of Mechanical Engineering, The University of Tokyo, Tokyo 113, Japan; Shibaura Institute of Technology 307 Fukasaku, Saitama-shi, Saitama, 330-8570 Japan

Sinopsis

Boiling transition and inverted annular heat transfer for R-113 have been investigated experimentally in a horizontal tube of 1.2 ×10−3 meter inner diameter with heating length over inner diameter ratio of 50. Experiments cover a high mass flux density range, a high local subcooling range and a wide local pressure range. Heat transfer characteristics were obtained by using heat flux control steady-state apparatus.
Film boiling treated here is limited to the case of inverted annular heat transfer with very thin vapor film, on the order of 10−6 meter. Moreover, film boiling region is always limited to a certain downstream part, since the system has a pressure gradient along the flow direction.
Discussions are presented on the parametric trends of boiling heat transfer characteristic curves and characteristic points. The possible existence is suggested of a spontaneous nucleation control surface boiling phenomena. And boiling transition heat flux and inverted annular heat transfer were correlated.

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