Evaporative cooling of air in an adiabatic channel with partially wetted zones
V.I. Terekhov1,2, M.V. Gorbachev2, and H.Q. Khafaji1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
E-mail: terekhov@itp.nsc.ru
Keywords: direct evaporative cooling, heat and mass transfer, laminar flow, step boundary conditions, thermal and humid efficiency
Pages: 221–230
Abstract
The paper deals with the numerical study of heat and mass transfer in the process of direct evaporation air cooling in the laminar flow of forced convection in a channel between two parallel insulated plates with alternating wet and dry zones along the length. The system of Navier–Stokes equations and equations of energy and steam diffusion are being solved in two-dimensional approximation. At the channel inlet, all thermal gas-dynamic parameters are constant over the cross section, and the channel walls are adiabatic. The studies were carried out with varying number of dry zones (n = 0–16), their relative length (s/l = 0–1) and Reynolds number Re = 50–1000 in the flow of dry air (j0 = 0) with a constant temperature at the inlet (T0 = 30 °C). The main attention is paid to optimization
analysis of evaporation cell characteristics. It is shown that an increase
in the number of alternating steps leads to an increase in
the parameters of thermal and humid
efficiency. With an increase in Re number and a decrease in
the extent of wet areas, the efficiency parameter reduces.
DOI: 10.1134/S0869864316020086
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