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ISSN Online: 2377-424X

International Heat Transfer Conference 3
August, 7-12, 1966, Chicago, USA

CRITICAL HEAT FLUX OF SATURATION AND SUBCOOLED POOL BOILING IN WATER AT ATMOSPHERIC PRESSURE

Get access (open in a dialog) DOI: 10.1615/IHTC3.60
pages 129-142

Sinopsis

The pool boiling system was studied through determination of the critical heat flux for a number of heater materials in the form of horizontal strips, wires and tubes. The pool was demineralised water at atmospheric pressure and was either at saturation or at a subcooling in the range 0-70 degrees Centigrade.

The saturation critical heat flux is a complex function of heater diameter, and this may be attributed to the vapour bubble behaviour as observed with a high-speed movie camera. The experimental variation of bubble departure diameter with wire diameter is approximately predicted with an energy balance equation developed by the present authors.

Two hundred values of subcooled critical heat flux were determined. Negligible difference was found for different shapes, sizes and thicknesses of heaters over the range of heaters tested. Observations of vapour bubble behaviour were recorded at different values of liquid subcooling. The use of narrow strip heaters in subcooled pool boiling limits the maximum size to which bubbles may grow when the heater width is comparable to the vapour bubble diameter.