Experiments were performed to investigate nucleate flow boiling and incipience in a vertical flow channel, , with one wall heated uniformly and others approximately adiabatic. Three channel spacings, 2, 1 and , were investigated. Initially subcooled R-11 flowed upward through the channel; the mass flux varied from , and the inlet pressure ranged up to . Liquid crystal thermography was used to measure distributions of surface temperature from which the heat transfer coefficients on the heated surface were calculated. Fully developed saturated nucleate boiling was correlated well by a modification of Kandlikar’s technique.
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.Copyright © 2005
by American Society of Mechanical Engineers
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