Laminar Forced Convection of Dusty Air through Porous Media in a Vertical Annulus
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Abstract
An experimental and numerical study has been carried out to investigate the forced convection heat transfer by clean or dusty air in a two dimensional annulus enclosure filled with porous media (glass beads) between two vertical concentric cylinders. The outer cylinder is of (82 mm) outside diameters and the inner cylinder of (27 mm) outside diameter. Under steady state condition; the inner cylinder surface is maintained at a high temperature by applying a uniform heat flux and the outer cylinder surface at an ambient temperature. The investigation covered values of input power of (6.3, 4.884, 4.04 and 3.26 W), Reynolds number values of (300, 700, 1000, 1500, and 2000) and dust ratio values (density number N) of (2, 4, 6 and 8). A computer program in MATLAB has been built to carry out the numerical solution by writing the governing equation in finite difference method. The local Nusselt number, the average Nusselt number, the contours of temperature field and velocity field were presented to show the flow and heat transfer characteristics. The results show that when clean air flow, the wall temperature gradually increases along the cylinder length in the direction of flow and decrease as Reynolds number increase while it increases with input power. For dusty air flow results show that the wall
temperature gradually increases along the axial direction and increase with Reynolds number and with input power, and the maximum reduction in heat transfer will be 30 % for N=8 at Re=2000. Comparison was made between the present experimental and numerical results and it gives good agreement. The experimental and numerical Nusselt number follows the same behavior with a mean
deviation of 12%.
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➢ Aaltosalmi U ,2005 Fluid Flow in Porous Media with the Lattice – Boltzmann Method PhD. Thesis, University of Jyväskylä on July 29, .
➢ Al-Sumaily Gazy F , John Sheridan, Mark C. Thompson,2012. Analysis of forced convection heat transfer from a circular cylinder embedded in a porous medium International Journal of Thermal Sciences 51 - 121-131.
➢ Al Zahrani and SuhilKiwan ,2008. Mixed Convection Heat Transfer in the Annulus Between Two Concentric Vertical Cylinders Using Porous Layers , J. of Transp Porous Med 76:391–405.
➢ Anderson A. A., Tannehill,C. J. and Pletcher H. R.1984, Computational Fluid Mechanics and Heat Transfer, McGraw – Hill book company/ Hemisphere Publisher.
➢ Cheng P., Hsu C.T. and Chowdhury A.,1988, Forced Convection in the Entrance Region of Packed Channel with a Symmetric Heating , Transactions of the ASME, Vol. 110, pp. 946 - 954.
➢ Kaurangini M.L. andBasant . K, 2009, Mixed Convection Flow in A Vertical Annulus Filled with Porous Material Having Constant Porosity , Techno Science Africana Journal, Volume 3 Number 1, June.
➢ Kumari M. and. Nathb G.,2008, Unsteady Natural Convection from a Horizontal Annulus Filled with a Porous Medium, Int. J. of Heat and Mass Transfer, Vol, 51, pp. 5001–5007. www.elsevier.com.
Shyamanta, 1998, MHD Flow and Heat Transfer of A Dusty Viscoelastic Stratified Fluid Down an Inclined Channel in Porous Medium Under Variable Viscosity, Theoretical and applied mechanics ,vol.26,PP.1-14 .
➢ Singh N. P. and Ajay Kumar Singh, 2003, MHD Free Convection and Mass Transfer Flow Past a Flat Plate, the Arabian Journal for Science and Engineering, vol. 32, number 1A .
➢ Wang Bu – Xuan and Zhang Xing,1990 “Natural Convection in Liquid Saturated Porous Media Between Concentric Inclined Cylinders” Int. J. Heat and Mass Transfer Vol. 33. No 5, pp. 827-833.