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AMMONIA SPRAY EVAPORATION HEAT TRANSFER PERFORMANCE OF SINGLE LOW-FIN AND CORRUGATED TUBES

DOI: 10.1615/ICHMT.2000.TherSieProcVol2TherSieProcVol1.430
pages 325-332

X. Zeng
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409-1021, USA

Ming-Chien Chyu
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas; School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas; Graduate Healthcare Engineering, Texas Tech University, Lubbock, Texas

Zahid Ayub
Isotherm, Inc.

Résumé

Evaporation of liquid ammonia distributes by commercial spray nozzles onto a horizontal low-fin steel tube of 19 mm diameter was rested. Experiments were conducted for the average local spray flow rate from 0.0139 kg/(s-m) to 0.0788 kg/(s-m), saturation temperature from −23.3 °C to 10 °C, and heat flux from 10 kW/m2 to 80 kW/m2. 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, 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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