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Jang, Bongsoo
Computational Mathematical Science Lab (CMS Lab)
Research Interests
  • Numerical analysis, dynamics, fractional systems, data sciences

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Cooling of Heat Sources by Natural Convection Heat Transfer in a Vertical Annulus

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Title
Cooling of Heat Sources by Natural Convection Heat Transfer in a Vertical Annulus
Author
Sankar, M.Do, YounghaeRyu, SoorokJang, Bongsoo
Issue Date
2015-10
Publisher
TAYLOR & FRANCIS INC
Citation
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, v.68, no.8, pp.847 - 869
Abstract
This article reports convection heat transfer in a short and tall annular enclosure with two discrete isoflux heat sources of different lengths. The discrete heat sources are mounted at the inner wall and the outer wall is maintained at a lower temperature, whereas the top and bottom walls and the unheated portions of the inner wall are kept at adiabatic. An implicit finite-difference method is employed to solve the vorticity-stream function formulations of the governing equations. The significant influence of the discrete heaters on the flow and heat transfer is analyzed for a wide range of modified Rayleigh numbers, aspect ratio, and length ratio (epsilon) of heat sources. Our numerical results reveal that the average Nusselt number decreases with aspect ratio, whereas the magnitude of maximum temperature increases with the aspect ratio. For most of the parametric cases considered in the present study, the heat transfer rate is found to be higher at the bottom heater than at the top heater except for epsilon=0.5. The effect of heater length ratio on the heat transfer rate is noticeable for unit aspect ratio, whereas its effect is insignificant as the aspect ratio increases. Furthermore, it was found that the maximum temperature is found generally at the top heater except for the case epsilon=0.5, where the maximum temperature is found at the bottom heater
URI
https://scholarworks.unist.ac.kr/handle/201301/11847
URL
http://www.tandfonline.com/doi/abs/10.1080/10407782.2015.1023097#.VZYTihvtlBc
DOI
10.1080/10407782.2015.1023097
ISSN
1040-7782
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