This paper presents a numerical study aimed at identifying a suitable turbulence model to describe the fully developed turbulent mixed convention of air in smooth horizontal pipes. The flow characteristics considered here are relevant to those typically observed in ventilated hollow core slab (VHCS) applications and, because of this, the adopted geometry and boundary conditions are represented by the Reynolds number and Richardson number of about 23,000 and 1.04, respectively. Empirical expressions available in the literature are used as reference to evaluate the accuracy of different turbulence models in predicting the dimensionless velocity (u+) and temperature (T+) profiles as well as the Nusselt number (Nu). Among the turbulence models considered, the standard and realizable k-ε models provide the best overall predictions of u+, T+, and Nu in the fully developed flow, and the former is recommended for the modeling of VHCS systems as it gives slightly better estimates of the Nu values.
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A Numerical Study of Turbulent Mixed Convection in a Smooth Horizontal Pipe
Ahmed Faheem,
Ahmed Faheem
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: ahmed.faheem@sydney.edu.au
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: ahmed.faheem@sydney.edu.au
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Gianluca Ranzi,
Gianluca Ranzi
Associate Professor
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: gianluca.ranzi@sydney.edu.au
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: gianluca.ranzi@sydney.edu.au
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Francesco Fiorito,
Francesco Fiorito
Faculty of Architecture, Design & Planning,
The University of Sydney,
Building G04,
New South Wales 2006, Australia
e-mail: francesco.fiorito@sydney.edu.au
The University of Sydney,
Building G04,
New South Wales 2006, Australia
e-mail: francesco.fiorito@sydney.edu.au
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Chengwang Lei
Chengwang Lei
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: chengwang.lei@sydney.edu.au
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: chengwang.lei@sydney.edu.au
Search for other works by this author on:
Ahmed Faheem
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: ahmed.faheem@sydney.edu.au
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: ahmed.faheem@sydney.edu.au
Gianluca Ranzi
Associate Professor
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: gianluca.ranzi@sydney.edu.au
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: gianluca.ranzi@sydney.edu.au
Francesco Fiorito
Faculty of Architecture, Design & Planning,
The University of Sydney,
Building G04,
New South Wales 2006, Australia
e-mail: francesco.fiorito@sydney.edu.au
The University of Sydney,
Building G04,
New South Wales 2006, Australia
e-mail: francesco.fiorito@sydney.edu.au
Chengwang Lei
School of Civil Engineering,
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: chengwang.lei@sydney.edu.au
The University of Sydney,
Building J05,
New South Wales 2006, Australia
e-mail: chengwang.lei@sydney.edu.au
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 12, 2015; final manuscript received June 22, 2015; published online August 11, 2015. Assoc. Editor: Antonio Barletta.
J. Heat Transfer. Jan 2016, 138(1): 012501 (11 pages)
Published Online: August 11, 2015
Article history
Received:
March 12, 2015
Revision Received:
June 22, 2015
Citation
Faheem, A., Ranzi, G., Fiorito, F., and Lei, C. (August 11, 2015). "A Numerical Study of Turbulent Mixed Convection in a Smooth Horizontal Pipe." ASME. J. Heat Transfer. January 2016; 138(1): 012501. https://doi.org/10.1115/1.4031112
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