The effect of an electric field on the falling-film evaporation of refrigerant R-134a on a vertical plate and three commercially available tubes was investigated experimentally. The plate test section was 25.4 mm wide and 76.2 mm long, and each tube test section was 19 mm in diameter and 140 mm long. Experiments were conducted in both falling film and spray evaporation modes. The effects of various parameters such as heat flux, refrigerant flow rate, electrode gap, and applied voltage were investigated. It was found that in the presence of an applied electric field, the maximum enhancement in the heat transfer coefficient for both falling film and spray evaporation modes on a plate was nearly the same. A maximum enhancement of fourfold in the heat transfer coefficient with the plate, 90 percent with the smooth tube, 110 percent with the Turbo BIII, and 30 percent with 19 fpi tube were obtained. The electrohydrodynamic power consumption in all cases was less than 0.12 percent of the total energy exchange rate in the test section. [S0022-1481(00)03003-6]
Falling Film and Spray Evaporation Enhancement Using an Applied Electric Field
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division, July 3, 1999; revision received, April 10, 2000. Associate Technical Editor: P. Ayyaswamy.
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Darabi, J., Ohadi, M. M., and Desiatoun, S. V. (April 10, 2000). "Falling Film and Spray Evaporation Enhancement Using an Applied Electric Field ." ASME. J. Heat Transfer. November 2000; 122(4): 741–748. https://doi.org/10.1115/1.1288932
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