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Research Papers

Convective Heat Transfer From a Heated Plate to the Orthogonally Impinging Air Jet

[+] Author and Article Information
Abhishek B. Bhagwat

Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Powai, Mumbai 400 076, India
e-mail: abhishek.bhagwat1@gmail.com

Arunkumar Sridharan

Associate Professor
Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Powai, Mumbai 400 076, India
e-mail: arunsri@iitb.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 9, 2015; final manuscript received June 9, 2016; published online August 2, 2016. Assoc. Editor: Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 8(4), 041009 (Aug 02, 2016) (9 pages) Paper No: TSEA-15-1325; doi: 10.1115/1.4034058 History: Received November 09, 2015; Revised June 09, 2016

The convective heat transfer process between the orthogonal air jet impingement on a uniformly heated flat plate is studied numerically. In this numerical study, three-dimensional (3D) simulations are carried out in Fluent 14.0 to investigate the effect of Reynolds number, distance between nozzle exit and the plate on the heat transfer characteristics. V2F turbulence model has been used to model turbulence. Standard κ–ε, Realizable κ–ε, κ–ε RNG, SST κ–ω, Standard κ–ω, V2F turbulence models have been studied for orthogonal jet impingement in this work. It is observed that for jet exit to plate distance (Z/d) of 0.5 ≤ Z/d ≤ 6, V2F model is best suited. For Z/d ≤ 0.5 and Z/d ≥ 6, numerical results vary significantly from the experimental results. Reynolds number of 12,000, 20,000, and 28,000 has been studied. In this paper, results for various jet exit to the plate distance (Z/d) from 0.5 to 10 are presented. At low jet plate spacing Z/d < 4, secondary peak in Nusselt number distribution over the plate is visible in experimental results. V2F model correctly predicts the secondary peak in Nusselt number variation over the plate. Other models fail to predict the secondary peak which is of significant importance in air jet impingement at low jet-plate spacing (Z/d < 4).

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Figures

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Fig. 1

Isometric view of the geometry used for meshing (not to scale)

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Fig. 2

Three-dimensional view of the meshed geometry

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Fig. 3

Validation for Z/d = 6, Re = 28,000

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Fig. 4

Validation for Z/d = 1, Re = 28,000

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Fig. 5

Grid independence results for Z/d = 1, Re = 28,000

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Fig. 6

Nusselt number and T.I. variation along the plate

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Fig. 7

Stagnation point Nusselt number variation with Z/d

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Fig. 8

Effect of varying Z/d for Re = 12,000

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Fig. 9

Effect of varying Z/d for Re = 20,000

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Fig. 10

Effect of varying Z/d for Re = 28,000

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Fig. 11

Nusselt number variation for Z/d = 0.5

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Fig. 12

Nusselt number variation for Z/d = 1

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Fig. 13

Nusselt number variation for Z/d = 2

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Fig. 14

Nusselt number variation for Z/d = 3

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Fig. 15

Nusselt number variation for Z/d = 4

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Fig. 16

Nusselt number variation for Z/d = 6

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Fig. 17

Nusselt number variation for Z/d = 8

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Fig. 18

Nusselt number variation for Z/d = 10

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Fig. 19

Axial Velocity, radial velocity, temperature, and T.I. profiles at different nondimensional radial locations (r/d) for Z/d = 1 and Re = 28,000 (a) Nondimensional axial velocity profile at different radial locations along the plate, (b) Nondimensional radial velocity profile at different radial locations along the plate, (c) Nondimensional temperature profile at different radial locations along the plate, and (d) Turbulence intensity profile at different radial locations along the plate

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