Unit Thermal Performance of Atmospheric Spray Cooling Systems

[+] Author and Article Information
R. W. Porter, M. Jain

Illinois Institute of Technology, Chicago, Ill.

S. K. Chaturvedi

Old Dominion University, Norfolk, Va.

J. Heat Transfer 102(2), 210-214 (May 01, 1980) (5 pages) doi:10.1115/1.3244262 History: Received July 27, 1979; Online October 20, 2009


Thermal performance of an open atmospheric spray pond or canal depends on the direct-contact evaporative cooling of an individual spray unit (spray nozzle or module) and the interference caused by local heating and humidification. Droplet parameters may be combined into a dimensionless group, number of transfer units (NTU) or equivalent, whereas large-scale air-vapor dynamics determine interference through the local wet-bulb temperature. Quantity NTU were implied from field experiments for a floating module used in steam-condenser spray canals. Previous data were available for a fixed-pipe nozzle assembly used in spray ponds. Quantity NTU were also predicted using the Ranz-Marshall correlations with the Sauter-mean diameter used as the characteristic length. Good agreement with experiments was shown for diameters of 1–1.1 cm (module) and 1.9 mm (fixed-pipe nozzle).

Copyright © 1980 by ASME
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