Thermal Entrainment in the Core Regions of Transitional Plane Fountains in Linearly Stratified Ambient Fluids

Inam, M.I., Lin, Wenxian, and Armfield, S.W. (2022) Thermal Entrainment in the Core Regions of Transitional Plane Fountains in Linearly Stratified Ambient Fluids. International Journal of Applied Mechanics, 14 (3). 2250020.

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Abstract

Thermal entrainment is an integral feature of free-shear flows involving temperature changes, including fountains (negatively buoyant jets). The understanding of thermal entrainment is essential for applications involving thermal stratification such as that in a solar water storage tank. In this study, thermal entrainment in the core regions of transitional plane fountains in linearly-stratified ambient fluids is studied numerically over a range of the Froude number, Reynolds number, and dimensionless thermal stratification parameter. The results show that thermal entrainment has a negligible effect on the inner core region, but is significant in the outer core region, particularly at the interfaces among the up flow, down flow, and ambient fluid, and the thermal entrainment parameter, which quantifies the extent of thermal entrainment, decreases with height or in a stronger stratification, but increases with increasing Froude number or Reynolds number. Several numerical relations are obtained with the numerical results for the thermal entrainment parameter.

Item ID: 75094
Item Type: Article (Research - C1)
ISSN: 1758-826X
Keywords: Thermal entrainment; plane fountain; stratification; transitional flow; numerical simulation
Copyright Information: © World Scientific Publishing Europe Ltd.
Funders: Australian Research Council (ARC)
Date Deposited: 25 Jul 2022 01:31
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401204 Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) @ 40%
40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401208 Geophysical and environmental fluid flows @ 50%
40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401207 Fundamental and theoretical fluid dynamics @ 10%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering @ 100%
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