Abstract
Evaporation of liquid ammonia distributed by commercial spray nozzles onto a horizontal low-fin steel tube of 3/4 in. diameter was tested. Experiments were conducted for the average local spray flow rate from 0.0139 kg/(s{center_dot}m) to 0.0788 kg/(s{center_dot}m), saturation temperature from {minus}23.3 C to 10 C, and heat flux from 10 kW/m{sup 2} to 80 kW/m{sup 2}. The effects of heat flux, saturation temperature, spray flow rate, and nozzle height were investigated. Both standard-angle and wide-angle commercial nozzles were tested. The Nu data were correlated as a function of Re, Pr, and reduced pressure, and heat flux. The heat transfer coefficient data of the low-fin tube are compared with those of a corrugated tube and plain tube.
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