0
Research Papers

Heat Transfer From an Isothermally Heated Flat Surface Due to Confined Laminar Twin Oblique Slot-Jet Impingement

[+] Author and Article Information
Muhammad A. R. Sharif

Mem. ASME
Aerospace Engineering
and Mechanics Department,
Aerospace Engineering,
The University of Alabama,
Tuscaloosa, AL 35487-0280
e-mail: msharif@eng.ua.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received August 13, 2014; final manuscript received January 30, 2015; published online March 31, 2015. Assoc. Editor: Srinath V. Ekkad.

J. Thermal Sci. Eng. Appl 7(3), 031001 (Sep 01, 2015) (11 pages) Paper No: TSEA-14-1190; doi: 10.1115/1.4029881 History: Received August 13, 2014; Revised January 30, 2015; Online March 31, 2015

Convective heat transfer from a heated flat surface due to twin oblique laminar slot-jet impingement is investigated numerically. The flow domain is confined by an adiabatic surface parallel to the heated impingement surface. The twin slot jets are located on the confining surface. The flow and geometric parameters are the jet exit Reynolds number, distance between the two jets, distance between the jet exit and the impingement surface, and the inclination angle of the jet to the impingement surface. Numerical computations are done for various combinations of these parameters, and the results are presented in terms of the streamlines and isotherms in the flow domain, the distribution of the local Nusselt number along the heated surface, and the average Nusselt number at the heated surface. It is found that the peak and the average Nusselt number on the hot surface mildly decreases and the location of the stagnation point and the peak Nusselt number gradually moves downstream as the impingement angle is decreased from 90 deg. The heat transfer distribution from the impingement surface gets more uniform as the impingement angle is reduced to 45 deg and 30 deg at lager jet-to-plate distance (4–8) with a corresponding overall heat transfer reduction of about 40% compared to the normal impinging jet case. The specified jet exit velocity profile boundary condition has considerable effect on the predicted Nusselt number around the impingement location. Fully developed jet exit velocity profile correctly predicts the Nusselt number when compared to the experimental data.

Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Al-Aqal, O. M., 2003, “Heat Transfer Distributions on the Walls of a Narrow Channel With Jet Impingement and Cross Flow,” Ph.D. dissertation, University of Pittsburgh, Pittsburgh, PA.
Polat, S., Huang, B., and Mujumdar, A. S., 1989, “Numerical Flow and Heat Transfer Under Impinging Jets: A Review,” Annu. Rev. Numer. Fluid Mech. Heat Transfer, 2, pp. 157–197. [CrossRef]
Jambunathan, K., Lai, E., and Moss, M., 1992, “A Review of Heat-Transfer Data for Single Circular Jet Impingement,” Int. J. Heat Fluid Flow, 13(2), pp. 106–115. [CrossRef]
Weigand, B., and Spring, S., 2011, “Multiple Jet Impingement—A Review,” Heat Transfer Res., 42(2), pp. 101–142. [CrossRef]
Dewan, A., Dutta, R., and Srinivasan, B., 2012, “Recent Trends in Computation of Turbulent Jet Impingement Heat Transfer,” Heat Transfer Eng., 33(4–5), pp. 447–460. [CrossRef]
Molana, M., and Banooni, S., 2013, “Investigation of Heat Transfer Processes Involved Liquid Impingement Jets: A Review,” Braz. J. Chem. Eng., 30(3), pp. 413–435. [CrossRef]
Gao, X., and Sunden, B., 2003, “Experimental Investigation of the Heat Transfer Characteristics of Confined Impinging Slot Jets,” Exp. Heat Transfer, 16(1), pp. 1–18. [CrossRef]
Saad, N. R., Polat, S., and Douglas, W. J. M., 1992, “Confined Multiple Impinging Slot Jets Without Cross-Flow Effects,” Int. J. Heat Fluid Flow, 13(1), pp. 2–14. [CrossRef]
Tzeng, P. Y., Soong, C. Y., and Hsieh, C. D., 1999, “Numerical Investigation of Heat Transfer Under Confined Impinging Turbulent Slot Jets,” Numer. Heat Transfer, Part A, 35(8), pp. 903–924. [CrossRef]
Aldabbagh, L. B. Y., and Sezai, I., 2002, “Numerical Simulation of Three-Dimensional Laminar, Square Twin-Jet Impingement on a Flat Plate, Flow Structure, and Heat Transfer,” Numer. Heat Transfer Part A, 41(8), pp. 835–850. [CrossRef]
Abdel-Fattah, A., 2007, “Numerical and Experimental Study of Turbulent Impinging Twin-Jet Flow,” Exp. Therm. Fluid Sci., 31(8), pp. 1061–1072. [CrossRef]
Beitelmal, A. H., Saad, M. A., and Patel, C. D., 2000, “The Effect of Inclination on the Heat Transfer Between a Flat Surface and an Impinging Two-Dimensional Air Jet,” Int. J. Heat Fluid Flow, 21(2), pp. 156–163. [CrossRef]
Tong, A. Y., 2003, “On the Impingement Heat Transfer of an Oblique Free Surface Plane Jet,” Int. J. Heat Mass Transfer, 46(11), pp. 2077–2085. [CrossRef]
Shen, J., Alyaser, M., and Beitelmal, A. H., 2006, “Turbulent Heat Transfer Study of Inclined Impinging Jets,” 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, American Institute of Aeronautics and Astronautics, San Francisco, CA, June 5–8, Vol. 3, pp. 1837–1850.
Eren, H., and Celik, N., 2006, “Cooling of a Heated Flat Plate by an Obliquely Impinging Slot Jet,” Int. Commun. Heat Mass Transfer, 33(3), pp. 372–380. [CrossRef]
O'Donovan, T. S., and Murray, D. B., 2008, “Fluctuating Fluid Flow and Heat Transfer of an Obliquely Impinging Air Jet,” Int. J. Heat Mass Transfer, 51(25–26), pp. 6169–6179. [CrossRef]
Akansu, Y. E., Sarioglu, M., and Kuvvet, K., 2008, “Flow Field and Heat Transfer Characteristics in an Oblique Slot Jet Impinging on a Flat Plate,” Int. Commun. Heat Mass Transfer, 35(7), pp. 873–880. [CrossRef]
Vipat, O., Feng, S. S., and Kim, T., 2009, “Asymmetric Entrainment Effect on the Local Surface Temperature of a Flat Plate Heated by an Obliquely Impinging Two-Dimensional Jet,” Int. J. Heat Mass Transfer, 52(21–22), pp. 5250–5257. [CrossRef]
Ibuki, K., Umeda, T., and Fujimoto, H., 2009, “Heat Transfer Characteristics of a Planar Water Jet Impinging Normally or Obliquely on a Flat Surface at Relatively Low Reynolds Numbers,” Exp. Therm. Fluid Sci., 33(8), pp. 1226–1234. [CrossRef]
Oztop, H. F., Varol, Y., and Koca, A., 2011, “Experimental Investigation of Cooling of Heated Circular Disc Using Inclined Circular Jet,” Int. Commun. Heat Mass Transfer, 38(7), pp. 990–1001. [CrossRef]
Parida, P. R., Ekkad, S. V., and Ngo, K., 2011, “Experimental and Numerical Investigation of Confined Oblique Impingement Configurations for High Heat Flux Applications,” Int. J. Therm. Sci., 50(6), pp. 1037–1050. [CrossRef]
Kito, M., 2012, “Effect of Inclination of Impinging Jets on Flow and Heat Transfer Characteristics,” Int. J. Science Eng. Invest., 1(9), pp. 42–47.
Afroz, F., and Sharif, M. A. R., 2013, “Numerical Study of Heat Transfer From an Isothermally Heated Flat Surface Due to Turbulent Twin Oblique Confined Slot-Jet Impingement,” Int. J. Thermal Sci., 74, pp. 1–13. [CrossRef]
ansys fluent Computational Fluid Dynamics Code Version 14.5, ANSYS Inc., Canonsburg, PA. http://www.ansys.com
Lee, D. H., Park, H. J., and Ligrani, P., 2012, “Milliscale Confined Impinging Slot Jets: Laminar Heat Transfer Characteristics for an Isothermal Flat Plate,” Int. J. Heat Mass Transfer, 55(9–10), pp. 2249–2260. [CrossRef]
Chiriac, V. A., and Ortega, A., 2002, “A Numerical Study of the Unsteady Flow and Heat Tranfer in a Transitional Confined Slot Jet Impinging on an Isothermal Surface,” Int. J. Heat Mass Transfer, 45(6), pp. 1237–1248. [CrossRef]
Lee, H. G., Yoon, H. S., and Ha, M. Y., 2008, “A Numerical Investigation on the Fluid Flow and Heat Transfer in the Confined Impinging Slot Jet in the Low Reynolds Number Region for Different Channel Heights,” Int. J. Heat Mass Transfer, 51(15–16), pp. 4055–4068. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Top—schematic of the flow geometry; bottom—sample mesh for the right half of the domain; L = 2, H = 6

Grahic Jump Location
Fig. 2

Convergence of local Nusselt number distribution on the hot bottom surface with mesh refinement

Grahic Jump Location
Fig. 3

Comparison of the predicted local Nusselt number distribution at the impingement surface with the experimental data

Grahic Jump Location
Fig. 4

Streamlines for the case with L = 4 and H = 4 (colored version is available online) (a) φ = 90 deg, (b) φ = 75 deg, (c) φ = 60 deg, (d) φ = 45 deg, and (e) φ = 30 deg

Grahic Jump Location
Fig. 5

Streamlines for the case with L = 4 and H = 8 (colored version is available online) (a) φ = 90 deg, (b) φ = 75 deg, (c) φ = 60 deg, (d) φ = 45 deg, and (e) φ = 30 deg

Grahic Jump Location
Fig. 6

Pressure coefficient distribution on the impingement surface for a few representative cases

Grahic Jump Location
Fig. 7

Skin friction coefficient distribution on the impingement surface for a few representative cases

Grahic Jump Location
Fig. 8

Isotherms for the case with L = 4 and H = 4 (colored version is available online) (a) φ = 90 deg, (b) φ = 75 deg, (c) φ = 60 deg, (d) φ = 45 deg, and (e) φ = 30 deg

Grahic Jump Location
Fig. 9

Isotherms for the case with L = 4 and H = 8 (colored version is available online) (a) φ = 90 deg, (b) φ = 75 deg, (c) φ = 60 deg, (d) φ = 45 deg, and (e) φ = 30 deg

Grahic Jump Location
Fig. 10

Distribution of the local Nusselt number at the hot bottom surface at different jet impingement angles, H = 2

Grahic Jump Location
Fig. 11

Distribution of the local Nusselt number at the hot bottom surface at different jet impingement angles, H = 4

Grahic Jump Location
Fig. 12

Distribution of the local Nusselt number at the hot bottom surface at different jet impingement angles, H = 6

Grahic Jump Location
Fig. 13

Distribution of the local Nusselt number at the hot bottom surface at different jet impingement angles, H = 8

Grahic Jump Location
Fig. 14

Variation of the maximum Nusselt number and its X-location on the hot bottom surface as a function of the jet impingement angle for various combinations of L and H

Grahic Jump Location
Fig. 15

Average Nusselt numbers at the hot bottom surface as a function of the jet impingement angle for various combinations of L and H

Grahic Jump Location
Fig. 16

Average Nusselt numbers at the hot bottom surface as a function of H for various combinations of L and φ

Grahic Jump Location
Fig. 17

Local Nusselt number distribution on the hot impingement plate for various jet exit velocity profiles

Grahic Jump Location
Fig. 18

Local Nusselt number distribution on the hot impingement plate as functions of jet channel length, and the corresponding jet exit velocity profiles

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In