2019/06/14 by Subhasisa Rath, Rath, Subhasisa, Sukanta Kumar Dash +1
Engineering · Environmental Science · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Vibration Analysis #Nanofluid Flow and Heat Transfer #Wind and Air Flow Studies
paper · pdf · doi:10.48550/arxiv.1906.06198
openalex publication_date 2019/06/14 · openalex created_date 2022/07/28 · openalex updated_date 2026/07/28
Laminar natural convection heat transfer from two horizontally aligned square\ncylinders has been investigated numerically using a finite-volume method (FVM)\napproach. Computations were performed to delineate the momentum and heat\ntransfer characteristics under the following ranges of parameters: horizontal\nspacing between the cylinders (0 <= S/W <= 10), tilt angle of the square\ncylinder (00 <= \δ <= 600), and Grashof number (10 <= Gr <= 105) for\nsome specific Newtonian fluids having Prandtl number (0.71 <= Pr <= 7). The\ncomprehensive results are represented in terms of temperature contours and\nstreamlines, velocity and temperature profiles, the mass flow rate in the\npassage between the cylinders, local and average Nu, and the drag coefficient.\nOwing to the development of a chimney effect, the heat transfer increases with\ndecrease in the horizontal spacing up to a certain limit, whereas it\nsignificantly degrades with a further decrease in the spacing. The square\ncylinder having \δ = 450 shows a higher heat transfer, whereas it is\nleast for \δ = 00. At higher Gr and Pr, the average Nu is found to be in\nexcess of 22% at \δ = 450 compared to at \δ = 00. Overall, the\naverage Nu has a strong dependence on both Gr and Pr, whereas it is a weak\nfunction of S/W and \δ. Furthermore, the entropy generation is reproduced\nnon-dimensionally in terms of the Bejan number. Finally, a correlation for the\naverage Nu has been developed, which can be useful for the engineering\ncalculations.\n