Numerical Study of Natural Convection in a Square Enclosure Filled by Nanofluid with a Baffle in the Presence of Magnetic Field

Authors

  • Amir Karimdoost Yasuri Department of Mechanical Engineering, Faculty of Engineering, Lorestan University, P.O. Box 465, Khoramabad, I.R. IRAN
  • Hossein Hatami Department of Mechanical Engineering, Faculty of Engineering, Lorestan University, P.O. Box 465, Khoramabad, I.R. IRAN
  • Mohsen Izadi Department of Mechanical Engineering, Faculty of Engineering, Lorestan University, P.O. Box 465, Khoramabad, I.R. IRAN
Abstract:

Natural convection heat transfer in a square enclosure with a horizontal baffle at the centerline of the left wall containing Al2O3-water in the presence of a magnetic field is investigated numerically. The top and bottom horizontal walls are adiabatic. The left wall and the baffle are maintained in constant temperature Th and the right wall is maintained in constant temperature Tc (Tc h). Discretized equations are solved using the SIMPLE algorithm. The numerical simulations have been carried out to determine the effect of parameters in the following ranges: Rayleigh number, Ra=103 to 106, nanoparticles volume fraction between j =0 to 5%, Hartmann number varied from Ha=0 to 60 and baffle length (L1=0 to 0.5L). The results show that the heat transfer rate increases with increasing Rayleigh number, but with increasing Hartmann number decreases. Also, increasing the baffle length enhances the heat transfer rate into the enclosure.

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Journal title

volume 38  issue 5

pages  209- 220

publication date 2019-10-01

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