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Research Papers

Numerical Simulation of Oblique Air Jet Impingement on a Heated Flat Plate

[+] 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 September 27, 2016; published online December 1, 2016. Assoc. Editor: Dr. Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 9(1), 011017 (Dec 01, 2016) (10 pages) Paper No: TSEA-15-1323; doi: 10.1115/1.4034913 History: Received November 09, 2015; Revised September 27, 2016

Jet impingement cooling has been studied extensively as this finds applications in the areas of reactor safety, electronic cooling, etc. Here, the convective heat transfer process between the air jet impingement on a uniformly heated inclined flat plate is studied numerically. In this numerical study, 3D simulations are carried out using commercial CFD code to investigate the effect of angle of inclination of plate, Reynolds number, and distance between the nozzle exit and the plate on the heat transfer characteristics. V2F model has been used to model turbulence for various nozzle–plate distance and Reynolds number. It can be concluded that V2F model predicts the Nusselt number variation on the plate satisfactorily. It is observed that point of maximum heat transfer is at the stagnation point in case of vertical jet impinging on a horizontal plate, while it shifts away from the point of impingement for the case of a vertical jet impinging on an inclined flat surface. The shift is toward the “compression side” or the “uphill side” of the air jet. The results are validated with experimental data from the literature. Detailed analysis of local heat transfer coefficients, velocity contours, temperature contours, and Nusselt number variations on the flat plate is presented.

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References

Figures

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Fig. 1

Jet impingement on flat horizontal surface [21]

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Fig. 2

Computational domain for the present study representing angle of impingement (θ) and azimuthal angle (α) (not to scale)

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Fig. 3

Meshed gambit model of an inclined flat plate with symmetry (angle between jet and plate is 60 deg)

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Fig. 4

Results for Nusselt number as a function of distance from stagnation point—grid independence study

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Fig. 5

Validation of results: (a) Z/d = 1, Re = 28,000 and (b) Z/d = 6, Re = 28,000

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Fig. 6

Contours of Nusselt number on an inclined plate Z/d = 6, Re = 41,722, and θ = 60 deg

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Fig. 7

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 6, Re = 41,722, and θ = 60 deg

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Fig. 8

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 6, Re = 16,680, and θ = 60 deg

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Fig. 9

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 6, Re = 16,680, and θ = 30 deg

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Fig. 10

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 6, Re = 41,722, and θ = 30 deg

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Fig. 11

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 4, Re = 16,680, and θ = 60 deg

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Fig. 12

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 4, Re = 41,722, and θ = 60 deg

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Fig. 13

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 4, Re = 28,000, and θ = 60 deg

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Fig. 14

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 4, Re = 41,722, and θ = 30 deg

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Fig. 15

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 4, Re = 16,680, and θ = 30 deg

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Fig. 16

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 10, Re = 16,680, and θ = 60 deg

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Fig. 17

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 10, Re = 41,722, and θ = 60 deg

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Fig. 18

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 10, Re = 16,680, and θ = 30 deg

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Fig. 19

Nusselt number variation along azimuthal angle (α) on inclined plate Z/d = 10, Re = 41,722, and θ = 30 deg

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Fig. 20

Nusselt number variation along the azimuthal angle on the plate for Z/d = 2, Re = 28,000, and θ = 60 deg

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Fig. 21

Nusselt number variation along the azimuthal angle on the plate for Z/d = 2, Re = 40,000, and θ = 60 deg

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Fig. 22

Effect of angle of impingement and plate-jet spacing on the Nusselt number at constant Reynolds number at α = 0 deg

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Fig. 23

Effect of angle of impingement and plate-jet spacing on the Nusselt number at constant Reynolds number at α = 180 deg

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Fig. 24

Effect of Reynolds number and plate-jet spacing on the Nusselt number at constant angle of impingement θ = 60 deg

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Fig. 25

Effect of Reynolds number and plate-jet spacing on the Nusselt number at constant angle of impingement θ = 60 deg

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Fig. 26

Absolute pressure variation along α = 0 deg and α = 180 deg showing shift in stagnation point (point of maximum pressure) for Z/d = 6 and Re = 41,722

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Fig. 27

Contours for velocity magnitude Z/d = 6, θ = 60 deg, and Re = 41,722

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Fig. 28

Velocity vectors for Z/d = 6, θ = 60 deg, and Re = 41,722

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