Laminar plane fountains impinging on a ceiling with an opposing heat flux

Srinarayana, N., Armfield, S.W., and Lin, Wenxian (2009) Laminar plane fountains impinging on a ceiling with an opposing heat flux. International Journal of Heat and Mass Transfer, 52. pp. 4545-4552.

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Abstract

The behaviour of unsteady planar strong fountains, impinging on a ceiling with an opposing heat flux on the ceiling, is investigated numerically for 8:0 6 Fr 6 30:0 at Re ¼ 50 and Pr ¼ 7. The height of the ceiling is varied in 10 6 H=Xin 6 25, where Xin is the half-width of the fountain source, and the non-dimensional gradient of the temperature difference between the fountain source and the ceiling is varied for 0:2 6 Dh=ðH=XinÞ 6 1:8. It is found that the fountain does not hit the ceiling, but instead stagnates and spreads at some distance from the ceiling due to the stratification of the fluids in the immediate vicinity of the ceiling. The scaling and direct numerical simulation results show that the augmented spreading distance Hd þ Xd has the scaling of Hd þ Xd XinFr2=9ðH=XinÞ1=2½Dh=ðH=XinÞ1=3 in the range studied, where Hd is the maximum fountain height, Xd is the spreading distance measured at Hd, respectively.

Item ID: 4831
Item Type: Article (Research - C1)
ISSN: 1879-2189
Keywords: impinging plane fountain, buoyancy dominated flows, opposing heat flux, stratification, numerical simulation, Scaling
Funders: Australian Research Council, National Natural Science Foundation of China
Date Deposited: 29 Jul 2009 23:59
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 50%
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