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Effect of circular cylinder location on three-dimensional natural convection in a cubical enclosure

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Abstract

This paper presents the results of immersed boundary method-based three-dimension numerical simulations of natural convection in a cubical enclosure with an inner circular cylinder at a Prandtl number of 0.7. This simulation spans three decades of Rayleigh number, Ra, from 103 to 106. The location of the inner circular cylinder is changed vertically along the centerline of the cubical enclosure. This study primarily focuses on the effects of both buoyancy-induced convection and the location of the inner circular cylinder on heat transfer and fluid flow in the cubical enclosure. In the range of Rayleigh numbers considered in this study, the thermal and flow fields eventually reach steady state, regardless of the location of the inner cylinder. When Ra is 103, the end wall of the cubical enclosure has a negligible effect on the thermal and flow fields in the enclosure. However, in the range of 104 ≤ Ra ≤ 106, the effect of the end wall on heat transfer and fluid flow in the enclosure depends on both the location of the inner cylinder and the Rayleigh number. Detailed analysis results for the distribution of streamlines, isotherms, and Nusselt numbers are presented in this paper.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan, 609-735, Korea

    Changyoung Choi, Hyun Woo Cho & Man Yeong Ha

  2. Global Core Research Center for Ships and Offshore Plants, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan, 609-735, Korea

    Hyun Sik Yoon

Authors
  1. Changyoung Choi
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  2. Hyun Woo Cho
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Correspondence to Man Yeong Ha.

Additional information

Recommended by Associate Editor Ji Hwan Jeong

Man-Yeong Ha received his B.S. degree from Pusan National University, Korea, in 1981, M.S. degree, in 1983, from Korea Advanced Institute of Science and Technology, Korea, and Ph.D. from Pennsylvania State University, USA in 1990. Dr. Ha is currently a Professor at the School of Mechanical Engineering at Pusan National University in Busan, Korea. He serves as an Editor of the Journal of Mechanical Science and Technology. His research interests are focused on thermal management, computational fluid dynamics, and micro/ nano fluidics.

Changyoung Choi received his B.S., M.S. and Ph.D. degrees from Pusan National University, Korea, in 2008, 2010 and 2014, respectively. In his master and doctoral course, he conducted many researches under the supervision of Prof. Man-Yeong Ha. His research interests are focused on flow analysis and control in turbulent flows and thermo-fluid phenomena analysis for enhancing the efficiency of the industrial devices.

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Choi, C., Cho, H.W., Ha, M.Y. et al. Effect of circular cylinder location on three-dimensional natural convection in a cubical enclosure. J Mech Sci Technol 29, 1307–1318 (2015). https://doi.org/10.1007/s12206-015-0246-3

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  • DOI: https://doi.org/10.1007/s12206-015-0246-3

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