Abstract

Heat transfer during the boiling of water, ethyl alcohol and Freon-113 from a 30–70% porous layer at atmospheric pressure was investigated. Bubble boiling on a porous layer commenced at small temperature differences of 1–1.5 K. At high heat fluxes, a vapour film appears at the base of the porous layer, thus a qualitative change in the mechanism of bubble boiling occurs. In relatively thick porous layers, the transition to this new mode of boiling occurs at critical heat flux values two to three times greater than for smooth surfaces. A heat transfer hysteresis was observed in thick porous layers.

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