THERMAL SCIENCE

International Scientific Journal

Dichang Wang

,

Hongyan Shi

,

Zengyan Lian

,

Pei Wang

,

Jie Liu

,

Wenqiang Lu

NUMERICAL STUDY OF THE LAMINAR NATURAL CONVECTION HEAT TRANSFER FROM THREE ATTACHED HORIZONTAL ISOTHERMAL CYLINDERS

ABSTRACT
Based on the model by Bejan et al., natural convection heat transfer, from three attached horizontal isothermal cylinders immersed in quiescent air in an inverted triangular array, has been numerically investigated over 10 ≤ Ra ≤ 106. The representative results made up of streamlines and isothermal contours, local and average Nusselt number have been showed. It can be seen there exist several vortexes in the wake region of the downstream cylinders because of the strong interaction of two merging plumes. Additionally, with the effect of the vortex and the preheating among three attached cylinders, the average heat transfer rate for the whole configuration has been reduced by about 38.7~58.5% compared with single cylinder. Finally, average Nusselt number for this configuration has been correlated with Rayleigh number, which provides a valid prediction for engineering calculation including this kind of fundamental configuration
KEYWORDS
natural convection, numerical simulation, three attached cylinders, nusselt number, correlating equation
PAPER SUBMITTED: 2021-12-26
PAPER REVISED: 2022-07-01
PAPER ACCEPTED: 2022-07-18
PUBLISHED ONLINE: 2022-10-08
DOI REFERENCE: https://doi.org/10.2298/TSCI211226158W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 6, PAGES [4797 - 4808]
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Numerical study of the laminar natural convection heat transfer from three attached horizontal isothermal cylinders

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