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Technical Brief

Comparison of Various RANS Models for Impinging Round Jet Cooling From a Cylinder

[+] Author and Article Information
Ketan Atulkumar Ganatra

Department of Mechanical Engineering,
National Institute of Technology,
West Imphal, Manipur 795004, India

Dushyant Singh

Department of Mechanical Engineering,
National Institute of Technology,
West Imphal, Manipur 795004, India
e-mails: dushyant7raghu@gmail.com; dushyant@nitmanipur.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 7, 2018; final manuscript received March 15, 2019; published online April 17, 2019. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 141(6), 064503 (Apr 17, 2019) (9 pages) Paper No: HT-18-1656; doi: 10.1115/1.4043304 History: Received October 07, 2018; Revised March 15, 2019

The numerical analysis for the round jet impingement over a circular cylinder has been carried out. The v2f turbulence model is used for the numerical analysis and compared with the two equation turbulence models from the fluid flow and the heat transfer point of view. Further, the numerical results for the heat transfer with original and modified v2f turbulence model are compared with the experimental results. The nozzle is placed orthogonally to the target surface (heated cylindrical surface). The flow is assumed as the steady, incompressible, three-dimensional and turbulent. The spacing between the nozzle exit and the target surface ranges from 4 to 15 times the nozzle diameter. The Reynolds number based on the nozzle diameter ranges from 23,000 to 38,800. From the heat transfer results, the modified v2f turbulence model is better as compared to the other turbulence models. The modified v2f turbulence model has the least error for the numerical Nusselt number at the stagnation point and wall jet region.

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Figures

Grahic Jump Location
Fig. 1

Schematic of fluid flow of the typical regions for the round jet impingement on heated cylinder configuration

Grahic Jump Location
Fig. 3

Comparison of nondimensional velocity distribution along the cylinder x/d axis for h/d = 4 and Red = 25,000

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Fig. 4

Comparison of nondimensional velocity distribution along the cylinder z/d axis for h/d = 4 and Red = 25,000

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Fig. 5

Schematic diagram of location for the mean streamwise velocity distribution along the radial direction in the computational domain

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Fig. 6

Comparison of the numerical and experimental mean streamwise velocity distribution along the radial coordinate for h/d = 4 and Red = 3300 at (a) θ = 15 deg, (b) θ = 60 deg, and (c) θ = 120 deg

Grahic Jump Location
Fig. 7

Comparison of the numerical and experimental mean streamwise velocity distribution along the radial coordinate for h/d = 4 and Red = 11,800 at (a) θ = 15 deg, (b) θ = 60 deg, and (c) θ = 120 deg

Grahic Jump Location
Fig. 8

Comparison of the local Nusselt number variation (various turbulence model) with the experimental results for Red = 38,800: (a) axial direction at h/d = 7.5, (b) radial direction at h/d = 7.5, (c) axial direction at h/d = 15, and (d) radial direction at h/d = 15

Grahic Jump Location
Fig. 9

Temperature distribution in the computational domain, the modified v2f turbulence model (v2f model—2) results for Red = 38,800: (a) radial direction at h/d = 7.5, (b) axial direction at h/d = 7.5, (c) radial direction at h/d = 15, and (d) axial direction at h/d = 15

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