Mixed Convection Heat Transfer in a Channel in Presence of Baffles
10 Pages Posted: 16 Apr 2019 Last revised: 31 May 2019
Date Written: April 10, 2019
Mixed convection heat transfer enhancement of laminar unsteady flow in a baffled and asymmetrically heated vertical channel is numerically studied. The baffles are installed on both walls in an offset manner. The governing equations are solved by the finite volume method using OpenFOAM code. Air (Pr = 0.71) is used as the working fluid. The effects of Reynolds number (100–1400) and Grashof number (2.5 × 104 to 2 × 105) in addition to the baffle height (0.1–0.5) on heat transfer and friction factor are evaluated. The results obtained indicated that the flow passes to the self-sustained oscillatory flow at moderate Reynolds number (below 600 for a blockage ratio of 0.25). Unsteady self- sustained flow leads to heat transfer enhancement up to 2.8 times for baffle height hb = 0.25 and up to 3.7 times for baffle height hb = 0.5 as compared to the smooth channel.
Keywords: Heat Transfer, Finite Volume Method, Mixed Convection, Oscillatory Flow
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