A computational study of heat transfer due to the inlet oscillating conditions in A 2-D jet impinging on an isothermal surface at a fixed reynolds number

Abstract

Heat transferis numerically investigated in aconfined oscillating laminar slot jet. The inlet velocity profile is uniform, and oscillating with an angle {CF}{86} (in radians) as follows:{cedil}{9D}{9C}{91} = {cedil}{9D}{9C}{91}{cedil}{9D}{91}{9A}{cedil}{9D}{91}{nonjoin}{cedil}{9D}{91}{AElig} {acute}{88}{97} {cedil}{9D}{91}{A0}{cedil}{9D}{91}{96}{cedil}{9D}{91}{9B}{acute}{81}{Lstrok}(2{cedil}{9D}{9C}{8B}{cedil}{9D}{91}{93}{cedil}{9D}{91}{Lstrok}).{CF}{86}max is the maximum jet angle, and f is the frequency of oscillation. The height-to-jet-width ratio was set to 5, the fluids Prandtl number is 0.74 and Reynolds number was fixed at 250.Strouhals numberSt, which is the other dimensionless group characterizing this problem, was varied in the range 0.05<St<0.75.The jet hydraulic diameter (2w), was used in the definition of both Strouhal and Reynolds numbers. {CF}{86}max was defined, based on a solid finding presented later in this paper. At St=0.4, and 0.5, a modest enhancement of heat transfer was noticed in the stagnation region, when compared to a steady jet.