Abstract:

This paper investigates the inlet-air velocity distribution and its influence on the heat and mass transfer as well as the flow resistance by reasonably predigesting the physical model.In the investigation,the realizable κ-ε model.the enhanced wall treatment and the SIMPLE arithmetic for the velocity.pressure coupling are adopted.The results indicate that(1)the error between the simulated and experimental results is within the range of 1 5%;(2)when the velocity of the inlet air ranges from 1.5 to 4.5 m/s,the deviation of heat transfer duty and the pres-sure drop reach 19.3%and 9.4%,respectively;(3)when the velocity angle of the inlet air ranges from -45°to 45°the deviation of heat transfer duty and the pressure drop respectively reach 1 5.5%and 1 8.0%;and(4)the optimal velocity and velocity angle of the inlet air are 2.4 to 3.3 m/s and -15°to 20°respectively.

Key words: evaporative condenser, inlet-air velocity distribution, heat transfer, mass transfer, flow resistance