Numerical analysis of 3D cross flow between corrugated parallel plates in evaporative coolers

Steady state laminar 3D cross flow, between two sinusoidal corrugated parallel plates, with perpendicular directions of corrugation is modeled in the present work. The velocity field is assumed to be periodic across each wave but the thermal field is assumed to be developing. The results are studied as thermal development and effect of the number of waves along the flow direction on bulk temperature and saturation efficiency, due to different Reynolds numbers, when Prandtl number is 0.7. Saturation efficiency increases with increase in the number of waves along media depth, and decreases when Reynolds number or the amplitude to wavelength ratio grows. There is a specific length of media depth in each geometrical aspect ratio and Reynolds number, which can satisfy any specific saturation efficiency. With respect to relations between desired relative humidity and saturation efficiency, in different residential, agricultural or industrial applications, the proper size of the domain or Reynolds number, can be estimated through the resulted diagrams. Respectively, further number of waves along media, follows unwanted additional pressure drop and waste of energy and material.