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International Heat Transfer Conference 10

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

EXPERIMENTAL DATA ON CHF FOR FORCED CONVECTION WATER BOILING IN LONG HORIZONTAL CAPILLARY TUBES

Adriano Maria Lezzi
Dipartimento di Ingegneria Meccanica ed Industriale, Universita degli Studi di Brescia, via Branze 38, 25123, Brescia, Italy

Alfonso Niro
Department of Energy, Politecnico di Milano, Via Lambruschini 4, Milano IT−20156, Italy

G. P. Beretta
Università di Brescia, Italy

DOI: 10.1615/IHTC10.1340
pages 491-496

Abstract

We present experimental results on critical heat flux in forced convection boiling of water in a horizontal capillary tube with inner diameter D = 1 mm, for L/D ratio approximately equal to 250, 500, and 1000. Data are for: low mass fluxes, between 800 and 2700 kg/m2s; pressures between 1.9 and 7.2 MPa; and inlet conditions between saturation and strong subcooling. In all cases fluid exit quality is high and critical heat flux is reached through dryout. Results are compared with extrapolations of the Katto correlation.

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