{"title":"Mixed Convection Enhancement in a 3D Lid-Driven Cavity Containing a Rotating Cylinder by Applying an Artificial Roughness","authors":"Ali Khaleel Kareem, Shian Gao, Ahmed Qasim Ahmed","volume":137,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":461,"pagesEnd":466,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10008884","abstract":"A numerical investigation of unsteady mixed convection heat transfer in a 3D moving top wall enclosure, which has a central rotating cylinder and uses either artificial roughness on the bottom hot plate or smooth bottom hot plate to study the heat transfer enhancement, is completed for fixed circular cylinder, and anticlockwise and clockwise rotational speeds, -1 ≤ Ω ≤ 1, at Reynolds number of 5000. The top lid-driven wall was cooled, while the other remaining walls that completed obstructed cubic were kept insulated and motionless. A standard k-ε model of Unsteady Reynolds-Averaged Navier-Stokes (URANS) method is involved to deal with turbulent flow. It has been clearly noted that artificial roughness can strongly control the thermal fields and fluid flow patterns. Ultimately, the heat transfer rate has been dramatically increased by involving artificial roughness on the heated bottom wall in the presence of rotating cylinder.","references":"[1]\tL. Shui-lian, M. Xiang-rui, W. Xin-li, Heat transfer and friction factor correlations for solar air collectors with hemispherical protrusion artificial roughness on the absorber plate, Solar Energy, 118 (2015) 460-468.\r\n[2]\tK. Khanafer, S. Aithal, Mixed convection heat transfer in a lid-driven cavity with a rotating circular cylinder, International Communications in Heat and Mass Transfer, 86 (2017) 131-142.\r\n[3]\tP. Biswal, M. Roy, S. Roy, T. 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