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Natural Convection from a Pair of Heated Cylinders in a Square Cavity with Non-uniform Temperature on the Side Walls

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Abstract

We analyze numerically the natural convective heat transport from two heated cylinders embedded within a cavity with non-uniformly cooled side walls for Ra (Rayleigh number) = 103–106 and S (dimensionless distance between the cylinders) = 0.1–0.4. The imposed non-uniform temperature distribution significantly alters the heat transfer characteristics, being governed by diffusion for low Ra and convection at higher Ra. The analysis yields less heat transfer for the spatially varying temperature profile case in comparison to a uniform temperature case. It reveals that at low Ra (≤ 104), the time-averaged Nusselt number Nut increases with S, while at high Ra (105 and 106), it increases first to reach a maximum value, then decreases and again increases thereafter. Furthermore, the rate of enhancement in Nusselt number with S is highly reduced at high Ra.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, 788010, India

    Navneet Goswami, Pitambar R. Randive & Sukumar Pati

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  1. Navneet Goswami
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  2. Pitambar R. Randive
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  3. Sukumar Pati
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Correspondence to Sukumar Pati.

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Goswami, N., Randive, P.R. & Pati, S. Natural Convection from a Pair of Heated Cylinders in a Square Cavity with Non-uniform Temperature on the Side Walls. J. Inst. Eng. India Ser. C 102, 389–396 (2021). https://doi.org/10.1007/s40032-021-00667-x

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