Geometrical effects on the subcooled flow boiling critical heat flux

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Abstract

The present work deals with the critical heat flux (CHF) under subcooled flow boiling conditions in short tubes. The field of application is in the very high heat flux region (up to 70 MW.m-2), which is of interest in fusion technology. The experimental work was carried out with water at pressures ranging from 0.1 to 0.8 MPa and water velocities from 5 to 50 m.s-1; employing stainless steel tubes with diameters ranging from 0.25 to 4 mm. The heated length varied from 10 to 160 mm (L/D varied from 5 to 40) and the wall thickness varied from 0.125 to 1.195 mm. The effects due to the variation of geometrical parameters (diameter, wall thickness and heated length) on the CHF are presented. The main results achieved in the experiment are: the CHF increases as the diameter decreases until a defined value, after this value the CHF is constant and independent of the channel diameter; the CHF is almost independent of the wall thickness; the CHF increases as the channel diameter decreases, a threshold exists above which such a functional dependence does not appear any longer and the CHF is independent of L/D. © Elsevier.
Original languageEnglish
Pages (from-to)807 - 814
Number of pages8
JournalRevue Generale de Thermique
Volume36
Issue number11
DOIs
Publication statusPublished - 1997

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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