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LAMINAR FORCED CONVECTION OF FERROFLUID IN A HORIZONTAL TUBE PARTIALLY FILLED WITH POROUS MEDIA IN THE PRESENCE OF A MAGNETIC FIELD

巻 18, 発行 4, 2015, pp. 437-448
DOI: 10.1615/JPorMedia.v18.i4.60
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要約

The effect of magnetic field on laminar forced convection of ferrofluid in a horizontal tube partially filled with porous media is investigated. Governing equations are solved numerically using the finite volume method and the SIMPLE algorithm, to obtain thermohydrodynamic characteristics and enhancement of heat transfer for different porous locations and Darcy numbers (Da). The Brinkman-Darcy model is used for simulation of homogeneous isotropic porous media that is located at the core, concentric to the tube, and local thermal equilibrium is assumed between the fluid and the solid matrix. The tube is under constant heat flux, volume fraction of the nanoparticles; Reynolds and Prandtl numbers are assumed constants. Numerical results show that using a magnetic field to reduce the pressure drop while using porous media enhances heat transfer. Also, it was found that decreasing the Darcy number from 0.1 to 0.001 results in a 56% enhancement of heat transfer. By increasing the radius ratio of porous media to the tube from 0.2 to 0.8 results in heat transfer enhancement of up to 57%. Moreover, using ferrofluid with a higher thermal conductivity than the base fluid results in a twofold heat transfer enhancement in the fully developed region and even more in the developing zone.

によって引用された
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