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http://dx.doi.org/10.3795/KSME-B.2016.40.11.717

Effect of Aspect Ratio of Enclosure with Inner Circular Cylinder on Three-Dimensional Natural Convection  

Lee, Jeong Min (Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
Seo, Young Min (Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
Ha, Man Yeong (Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.40, no.11, 2016 , pp. 717-726 More about this Journal
Abstract
This study evaluated the effect of aspect ratio of an enclosure with a heated inner circular cylinder on three-dimensional natural convection. The immersed boundary method was used to model the inner circular cylinder based on the finite volume method. The Rayleigh number was varied between $10^5$ and $10^6$, and the Prandtl number was maintained at 0.7. The aspect ratio of the three-dimensional enclosure was changed in steps of 1 within a range of 1-4 by increasing the width of the enclosure. In this study, the flow and thermal fields in the enclosure reached the steady state, and showed a mirror-symmetric pattern with respect to the center plane (x=0). In addition, the surface-averaged Nusselt number of the inner circular cylinder increased, while the total surface-averaged Nusselt number of the enclosure walls decreased with increase in the aspect ratio of the enclosure.
Keywords
Natural Convection; Aspect Ratio; Hot Inner Circular Cylinder; Rectangular Enclosure; Three-dimension; Immersed Boundary Method;
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