Research Papers

Effect of Freestream Motion on Heat Transfer Characteristics of Turbulent Offset Jet

[+] Author and Article Information
Sushil Kumar Rathore

Assistant Professor
Department of Mechanical Engineering,
National Institute of Technology Patna,
Patna, Bihar 800005, India
e-mail: isushilrathore@gmail.com

Manab Kumar Das

Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur, West Bengal 721302, India
e-mail: manab@mech.iitkgp.ernet.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 31, 2014; final manuscript received August 20, 2015; published online November 11, 2015. Assoc. Editor: Chakravarthy Balaji.

J. Thermal Sci. Eng. Appl 8(1), 011021 (Nov 11, 2015) (12 pages) Paper No: TSEA-14-1140; doi: 10.1115/1.4031524 History: Received May 31, 2014; Revised August 20, 2015

The numerical simulation of turbulent offset jet flow has been carried out using k–ω shear stress transport (SST) model. The simulations have been done for the offset jet flow in the quiescent medium and also in the presence of an external stream. The effect of freestream velocity on the flow and heat transfer characteristics of turbulent offset jet has been reported. The offset ratio and Reynolds number of flow considered are 5.7 and 16,000, respectively. The presence of coflow stream has been found to reduce the entrainment of surrounding fluid into the jet which in turn reduces the heat transfer from the jet to the surrounding medium. The effect of freestream velocity on the important parameters like decay of the local maximum streamwise velocity, jet spread, reattachment length, velocity logarithmic profile, velocity defect law profile, decay of the local maximum streamwise temperature, variation of wall temperature, temperature similarity profile, and Nusselt number distribution has been discussed.

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Fig. 1

Schematic diagram of an offset jet and a wall jet: (a) an offset jet and (b) a wall jet

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Fig. 2

Grid independence study and grid distribution near the wall: (a) grid independence study and (b) typical grid distribution zoomed near the wall (OR = 5.7)

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Fig. 3

Variation of value of y+ for the first near-wall grid points

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Fig. 4

Streamlines plot for offset jet (U∞=0.0): (a) streamlines and (b) zoomed view of streamlines near the wall

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Fig. 5

Streamlines plot for offset jet (U∞=0.22)

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Fig. 6

Vector plots for offset jet: (a) U∞ = 0.0 and (b) U∞ = 0.22

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Fig. 7

Distribution of streamwise and cross-streamwise velocity components for U∞=0.27: (a) contours of streamwise velocity and (b) contours of cross-streamwise velocity

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Fig. 8

Nondimensional velocity profile for offset jet at different axial locations: (a) X = 3.0, (b) X = 6, (c) X = 12, (d) X = 18, (e) X = 27, and (f) X = 33

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Fig. 9

Streamwise decay of the local maximum velocity

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Fig. 10

Streamwise variation of entrainment volume flow rate for different coflow velocities: (a) U∞= 0, (b) U∞= 0.14, (c) U∞= 0.22, and (d) U∞= 0.27

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Fig. 11

Velocity logarithmic law profile for offset jet near the wall

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Fig. 12

Velocity defect law profile for offset jet

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Fig. 13

Streamwise variation of Y0.5 for offset jet

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Fig. 14

Profile of development of Y0.5−Ymax along the streamwise direction

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Fig. 15

Similarity solution for offset jet for different values of freestream velocity: (a) U∞= 0.0 and (b) U∞= 0.27

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Fig. 16

Variation of skin friction coefficient for offset jet

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Fig. 17

Temperature profiles at different streamwise locations: (a) X = 5.0, (b) X = 10.0, (c) X = 15.0, (d) X = 20.0, (e) X = 25.0, and (f) X = 30.0

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Fig. 18

Temperature distribution in the domain for offset jet: (a) U∞= 0.0 and (b) U∞= 0.27

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Fig. 19

Streamwise decay of local maximum temperature

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Fig. 20

Variation of wall temperature along the streamwise direction

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Fig. 21

Temperature similarity profile for offset jet: (a) U∞= 0.0 and (b) U∞= 0.22

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Fig. 22

Streamwise variation of the local Nusselt number for isothermal and isoflux boundary conditions: (a) isothermal boundary condition and (b) isoflux boundary condition




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