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http://dx.doi.org/10.3795/KSME-B.2014.38.11.943

The Effect of the Prandtl Number on Natural Convection in a Square Enclosure with Inner Cylinder of Various Positions  

Seong, Seon Yu (School of Mechanical Engineering, Pusan Nat'l Univ.)
Choi, Changyoung (School of Mechanical Engineering, Pusan Nat'l Univ.)
Ha, Man Yeong (School of Mechanical Engineering, Pusan Nat'l Univ.)
Yoon, Hyun Sik (Global Core Research Center for Ships and Offshore Plants, Pusan Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.11, 2014 , pp. 943-950 More about this Journal
Abstract
This paper presents a numerical study conducted for analyzing the effect of the Prandtl number on natural convection in a square enclosure with an inner circular cylinder in various positons. Several Prandtl numbers (Pr = 0.1, 0.7, and 7) and Rayleigh numbers (Ra = $10^3$, $10^4$ and $10^5$) are considered in the numerical study, along with different positions of the inner circular cylinder. The position of the inner circular cylinder is changed in steps of 0.1 in the range of -0.2 to 0.2. The effect of the Prandtl number on natural convection in the enclosure is analyzed on the basis of the thermal and flow fields and the distribution of the Nusselt number. Regardless of the position of the cylinder, when the Rayleigh number is $10^5$, the surface-averaged Nusselt number of the inner cylinder and the enclosure increases as the Prandtl number increases.
Keywords
Natural Convection; Prandtl Number Effect; Inner Circular Cylinder; Vertical Location;
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