Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7053863 | International Journal of Heat and Mass Transfer | 2018 | 11 Pages |
Abstract
This paper numerically investigates the two-dimensional natural convection in a square enclosure with a vertical array of a hot elliptical cylinder and a hot circular cylinder with Rayleigh numbers in the range of 104⩽Ra⩽106. An immersed boundary method was used to capture the wall boundary of the cylinders. The effects of the position and inclination angle Ï of the elliptical cylinder were investigated. When the Rayleigh number increases to Raâ¯=â¯106, the numerical solutions reach an unsteady state for all cases of the lower elliptical cylinder and the cases of the upper elliptical cylinder except at Ï=90°. The transition of the flow regime from unsteady state to steady state depends on the flow direction and the space between the upper cylinder and top wall of the enclosure due to the changes in the inclination angle of the elliptical cylinder. At Raâ¯=â¯106 in the case of upper elliptical cylinder at Ï=0°, the time- and surface-averaged Nusselt numbers for the walls of the enclosure increase by about 1.99% compared to the case of two circular cylinders. The thermal performance and flow stability were influenced by the position and inclination angle of the elliptical cylinder.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Seong Hyun Park, Yeong Min Seo, Man Yeong Ha, Yong Gap Park,