期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 127, 期 -, 页码 927-947出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2018.06.129
关键词
Mixed convection; Square cylinder; Richardson number; Incidence angle; Strouhal number
Fluid dynamics and heat transfer behaviour are studied past side-by-side square cylinders at incidence in vertical flow arrangement numerically considering laminar, Newtonian, steady, incompressible and two-dimensional flow using Finite Volume Method based ANSYS Fluent solver. Using air (Pr = 0.7) as the working fluid, computations are performed at a representative value of Re = 100. The angle of incidence (alpha) is varied from 0 degrees to 45 degrees in the step of 5 degrees, whereas, the lateral distance between the cylinders is kept constant. To consider all possibilities, cylinders are rotated either clockwise or counter-clockwise, simultaneously or individually, which generates thirty-four different orientations. Buoyancy assisting phenomenon is created by changing the Richardson number (Ri) from 0 to 1 in step of 0.25. Due to the variation of the angle of incidence and its orientations, vortex generation is observed in the buoyancy assisting case at a critical value of Ri. To study heat transfer characteristics, time average and the local Nusselt number are analysed. For a fixed lateral distance between the cylinders, maximum heat transfer is found to occur at an incident angle of 45 degrees. Other important parameters, such as drag coefficient (C-D), lift coefficient (C-L), Strouhal number (St) are also studied. (C) 2018 Elsevier Ltd. All rights reserved.
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