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International Heat Transfer Conference 9

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

FORCED CONVECTIVE SUBCOOLED BOILING HEAT TRANSFER AND CHF IN SMALL-DIAMETER TUBES

S. Hosaka
Dept. of Technical Development, Central Japan Railway Corp., Tokyo 100

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

Nobuhide Kasagi
Center for Research and Development Strategy, Japan Science and Technology Agency; Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

DOI: 10.1615/IHTC9.220
pages 129-134

Résumé

A series of systematic experiments were conducted to identify the effects of tube diameter, specifically of its decrement, on the critical heat flux (CHF) and the heat transfer coefficient in a film boiling range. The working fluid used for the tests was Freon R113, which was made to flow alternately through tubes of 0.5mm, 1mm and 3mm in inner diameter under a pressure of 1.1 to 2.4 MPa, at a subcooling level of 50 to 80 K and at a mass flux of 1~3 × IO4 kg/m2s. Under these conditions, even with no stepwise discontinuity in the boiling curve, the heat transfer coefficients showed a distinct peak near the departure from nucleate boiling (DNB) point as the wall heat flux increased. On the whole, a decrease in tube diameter resulted in higher CHF and greater film boiling heat transfer coefficients.

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