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By G. Hetsroni, S. Sideman, J. P. Hartnett

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1970). 105. R. K . SAKHUJA and W. M . , N o v . 1971, San Francisco. 106. E . D . FEDOROVICH a n d W . M . ROHSENOW, T h e effect o f vapor subcooling o n film condensation o f metals, Int. J. Heat and Mass Transfer 1 2 , 1525-9 ( N o v . 1969). 44 107. 108. 109. 110. 111. 112. 113. 114. 115. 116. W . M. R O H S E N O W D . J. WILHELM, Condensation o f metal vapors: mercury a n d the kinetic theory o f condensation, U S A E E C Rept. N o . A N L 6948, Oct. 1964; also P h . D . thesis, Chem. E n g .

If the vapor passage is a confined channel, the vapor velocity may be high and produce a high shear stress at the liquid-vapor interface resulting in a thinner film; also if the surface is long enough in the flow direction the liquid layer may change to turbulent flow. In the downward flow of vapor both of these effects significantly increase the heat transfer coefficient; Rohsenow et al. [95] and Dukler [96]. A major cause of low heat transfer coefficients is the presence of even small traces of noncondensable gas which get carried with the vapor to the cold surface and accumulate there providing a diffusion resistance to the vapor.

Thus the test section power of a Freon system will be only ~ 6% of that of an equivalent water system. t Other terms used to denote C H F : dryout heat flux, burnout heat flux. 45 46 S. Y. AHMAD AND D. C. GROENEVELD 2. Fréon-12 at 155 psia and 112°F has been used to scale critical heat flux in steamwater mixtures at 1000 psia and 545°F. At these lower temperatures and pressures loop construction costs are reduced considerably and visualization studies can be conducted. Visualization is particularly helpful in dry patch, flow regime, instability, crossflow and void-distribution studies.

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