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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

A SIMPLE MODEL FOR DROPWISE CONDENSATION HEAT TRANSFER NEGLECTING SWEEPING

Get access (open in a dialog) DOI: 10.1615/IHTC8.100
pages 1659-1664

Resumo

A model is developed which considers that conduction heat transfer near the perimeter of the drop provides the major contribution to the heat transfer. The analysis incorporates the size distribution, departure size, solid surface subcooling, and a variable liquid-vapor interphase coefficient. For any given body force the condensing heat transfer coefficients computed with variable liquid-vapor interphase coefficients differ from that for constant coefficients by factors of 1.5 to 0.5, corresponding to surface subcoolings of 0.1 to 100°C for water vapor at atmospheric pressure, for body forces over the range 1≤a/g≤2000. Experimental data are presented for steam with variable body force over the range 1≤a/g≤800, over a limited degree of surface subcooling. Comparison with the analysis using the variable liquid-vapor interphase coefficient is quite good, employing no empirical constants except that implied in the empirical distribution function.