Influence of Size and Location of a Thin Baffle on Natural Convection in a Vertical Annular Enclosure

Authors

1 Department of Mathematics, School of Engineering, Presidency University, Bangalore, India

2 Department of Mathematics, Sapthagiri college of Engineering, Bangalore, India

3 Department of Mathematics, Siddaganga Institute of Technology, Tumkur, India

4 Department of Mathematics, KNU-Center for Nonlinear Dynamics, Kyungpook National University, Daegu, South Korea

Abstract

This article reports the numerical study of natural convection in a differentially heated cylindrical annular enclosure with a thin baffle attached to inner wall. The inner and outer walls of the annulus are respectively maintained at higher and lower temperatures, whereas the top and bottom walls are thermally insulated. Using an implicit finite difference technique, the effects of baffle size and location on natural convection has been investigated for different Rayleigh numbers and radius ratios by fixing the Prandtl number at 0.707. Through the detailed numerical simulations, we have successfully captured the important effects of baffle size and location on the flow pattern and heat transfer rate. It has been found that the size and location of baffle modify the flow pattern and heat transfer rate in a completely different conducts. The numerical results corroborates that the average heat transfer rate increases with the Rayleigh number, radius ratio, baffle position; but decreases with baffle length. Further, it has been observed that it is possible to enhance or suppress the flow circulation and heat transfer rates by a proper choice of baffle size and location, and Rayleigh number.

Keywords

Journal of Applied Fluid Mechanics
Volume 9, Issue 6
October 2016
Pages 2671-2684

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