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International Heat Transfer Conference 9

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

HEAT TRANSFER CHARACTERISTICS IN A CLOSED TWO-PHASE THERMOSYPHON

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

G. Radaelli
Dipartimento di Energetica, Politecnico di Milano, Milano 20133, Italy

P. A. Andreini
Energetics Department, Polytechnic of Milan, P.zza Leonardo da Vinci 32,20133, Milano - Italy

DOI: 10.1615/IHTC9.140
pages 81-86

Résumé

We present experimental results and theoretical considerations on the boiling mechanisms in a closed two-phase thermosyphon in order to define the frontiers between the main boiling regimes and the heat transfer characteristics.
We first review the boiling regimes, the causes of the unsteady operations and the correlations describing the frontiers between the main regimes. Then we review the correlations to estimate the heat transfer coefficients at the evaporator and the condenser. Experimental data are in good agreement with the proposed correlations.

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