Force Convection Heat Transfer from a Stationary circular Cylinder in Non-Newtonian Fluids

Authors

Prof., Department of Mech. and Aerospace Eng., Sci. and Research Branch, Islamic Azad Univ., Tehran, Iran.

Abstract

In the current study, force convection heat transfer from a stationray circular cylinder in non-newtonian fluids has been simulated using the lattice Boltzmann method in 2D and unsteady flow regime. The simulations were performed for three Reynolds numbers (80, 100 and 120), with Prandtl numbers 10 and 20, the different non-newotonian power-law index in the range of 0.4 to 1.8 while varying the Brikman number from 0, 1 to 3. The effects of different Parameters on the vorticity contour, isotherm patterns, local Nusselt number and periodic-surface average Nusselt number is studied. The results show that viscous dissipation plays main when the operating fluid is non-newtonian. As the fluid behavior changes from shear-thinning fluids to Newtonian and then to shear-thickening fluids, the length and width of the wakes increase and sepration between the isotherms contours deacreases. Broadly, the rate of heat transfer deacreses with decreasing Reynolds and Prandtl numbers, and with increasing value of the Brikman number and the power-law index.

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References

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Journal of Solid and Fluid Mechanics
Volume 5, Issue 4 - Serial Number 4
January and February 2016
Pages 229-242

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