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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

POOL BOILING IN A REDUCED GRAVITY FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC9.1860
pages 91-112

Sinopsis

Gravity is a parameter in many model laws of pool boiling heat transfer. However, very few experiments were made to prove its influence and therefore it is not surprising that some correlations are quite contradictory. In a series of experiments under microgravity, we found the influence of gravity on pool boiling to be very small. This applies for several substances (FREON12, FREON 113 and water) and different heater geometries (wires, flat plates). The dependency on the fluid state was tested especially with FREON 12 and is as well very small. Critical heat fluxes, generally speaking, were higher than the values predicted by theory. Film boiling, in contrast, showed a clear gravity dependency with different laws for subcooled and saturated fluid states. The basic heat transport mechanism is evaporation at the heater wall. All other transport mechanisms seem to be of secondary order.