A numerical study of direct evaporative air cooler by forced laminar convection between parallel-plates channel with wetted walls

The paper deals with numerical investigation of heat and mass transfer in the process of direct evaporative air cooling by forced laminar convection in a channel between two infinite parallel plates with wetted walls. The system of Navier-Stokes equations and diffusion and energy equations in a 2D approach is solved. At the channel inlet all thermal-gas dynamic parameters are constant across section, and the channel walls are adiabatic. The investigations were carried out with variation of the Reynolds number Re = 50–1000 and the relative humidity at the inlet ϕ 0 = 0–50% at constant incoming air temperature T 0 = 30°C. The emphasis is on the optimization analysis of the evaporative cell characteristics. It is shown that the saturation zone displaces down the flow as the Reynolds number grows. The parameter of thermal hydraulic efficiency decreases with growing Re and relative air humidity at the inlet.

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