Thermal magneto-hydrodynamics in a ventilated porous enclosure
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Sådhanå (2020)45:224 https://doi.org/10.1007/s12046-020-01459-2
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Thermal magneto-hydrodynamics in a ventilated porous enclosure CHANDRACHUR HAZRA1, NIRMALENDU BISWAS2
and NIRMAL K. MANNA1,*
1
Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India Department of Power Engineering, Jadavpur University, Salt Lake, Kolkata 700106, India e-mail: [email protected]
2
MS received 14 April 2018; revised 9 March 2019; accepted 22 April 2019 Abstract. The present study examines mixed convection in a ventilated cavity saturated with porous substance and heated at the right-bottom and top-left corners under the influence of uniform magnetic field applied externally. The analysis is carried out numerically using in-house CFD code. Five different heating configurations are analyzed. The effects of pertinent parameters such as Reynolds number (Re = 1–1000), Richardson number (Ri = 0.1–100), Darcy number (Da = 10-7–10-3), Hartmann number (Ha = 1–100), angle of magnetic field (c = 0–180) and porosity (e = 0.1–1.0), on the flow and temperature fields are examined for the search of the appropriate configuration yielding optimum heat transfer rate. Furthermore, heat transfer characterization at different heating configurations and parametric combinations is assessed. Keywords.
Ventilated enclosure; mixed convection; corner heating; MHD; porous medium.
1. Introduction Both fluid flow and heat transfer in a ventilated cavity are encountered in many transport processes in the nature as well as in numerous engineering application devices. Consequently the study on mixed convection has received a considerable attention since long past in the context of applications in drying technologies, cooling of the electronic devices, material processing, atmospheric flows, solar energy storage, heat exchangers, and many more. Basak et al [1] examined mixed convection of a lid driven porous square cavity with various heating conditions at the bottom wall. They analyzed the influence of convection through Peclet number and found that at high values of Peclet number there is a strong coupling between flow fields and temperature. Oztop [2] studied the mixed convection heat transfer in a lid driven and partially heated cavity filled with porous media. Mixed convection in a double lid driven cavity saturated with anisotropic non-Darcy porous medium using heatlines was studied by Ahmed [3]. Mojumder et al [4] examined mixed convection in a porous L-shaped cavity with the top-most wall moving. Mixed convection in a sinusoidally heated square cavity was examined by
This paper is a revised and expanded version of an article presented in ‘‘First International Conference on Mechanical Engineering’’ held at ‘Jadavpur University’, Kolkata, India during January 4–6, 2018 (INCOM-2018).
*For correspondence
Zainuddin et al [5]. They found that the sinusoidal heating increases the strength of flow compared to that resulting from uniform heating. Several authors [6–9] also
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