ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
LIQUID-SOLID CONTACT AND ITS RELATIONSHIP TO IMPROVED FILM BOILING HEAT TRANSFER RATES
要約
The possible improvement .of film boiling heat transfer through the use of surface macro-roughness elements is the subject of the present study. A macro-roughened heating surface was fabricated with a flush-mounted micro-thermocouple in the protruding end of one of the macro-roughness elements. The temperature measurements obtained from this micro-thermocouple indicated that intermittent, direct liquid-solid contact occurred between the boiling liquid and the instrumented macro-roughness element at bulk surface temperatures significantly above the smooth surface minimum film boiling temperature. The boiling heat transfer on the macro-roughened surface was found to be as much as 500% greater than that measured for the same liquid on a smooth surface at the same bulk surface temperature.