Skip to content
BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access July 28, 2013

Flow structure and cooling behavior of air impingement on a target plate

  • Adnan Abdul Rasool EMAIL logo and Faik Hamad
From the journal Open Engineering


An experimental data of flow field, pressure coefficient and heat transfer of a jet impinging normally on a flat target plate are presented. The measurements of temperatures and static pressures were carried out for flow from three orifices of 5, 10 and 20 mm diameter for orifice-to-target plate distances of 5, 10, 25, 50, 70, 100 and 120 mm from the orifice exit. The axial development of flow structure of the jet from the orifice was investigated by measuring the radial jet velocity distributions at the same axial distances used to measure heat transfer and static pressure. The results show that pressure coefficients distributions on the target plate are similar to the velocity distributions in the impinging jet which indicates the strong relationship between the two parameters. The pressure coefficients from large orifice diameter are higher than the values from the small orifice diameter for same orifice-to-target plate distance. The results also show a nonlinear increase of heat transfer rate with orifice size and the ratio of axial distance to orifice diameter (X/d). The nonlinear behaviour may be attributed to the complex nature of flow structure at the stagnation region. The high velocity gradients at the stagnation zone leads to higher turbulence and comparatively higher values of heat transfer rates for large orifice diameter.

[1] San J. Y., Huang C. H., Shu M. H., Impingement cooling of a confined circular air jet. Int. J. Heat Mass Transfer, 1997, 40, 1355–1364 in Google Scholar

[2] Behina M., Parneix S., Shabany Y., Durbin P. A., Numerical study of turbulent heat transfer in a confined and unconfined impinging jets. Int. J of heat and fluid flow, 1998, 20, 1–9 in Google Scholar

[3] Behina M., Parneix S., Shabany Y., Durbin P. A., Prediction of heat transfer in an axisymmetric turbulent jet impinging on flate plate. Int. J of heat and mass transfer, 1998, 41, 1413–1426 10.1016/S0017-9310(97)00254-8Search in Google Scholar

[4] Goldestien R. J., Behbahani A. I., Impingement of circular jet with and without cross flow. Int. J. Heat Mass Transfer, 1982, 25, 1377–1382 in Google Scholar

[5] Lee D., Greif R., Lee S. J., Lee J. H., Heat transfer from a flat plate to a fully developed axsymmetric impinging jet. Transactions of the ASME, 1995, 117, 772–776 in Google Scholar

[6] Knowles K., Myszko M., Turbulence measurements in radial wall-jet. Exp. Thermal fluid Sci., 1998, 17, 71–78 in Google Scholar

[7] O’Donovan T. S., Murray D. B., Jet impingement heat transfer-part 1: Meanand root-mean-square heat transfer and velocity distribution. Int. J. Heat Mass Transfer, 2007, 50, 3291–3301 in Google Scholar

[8] Mohanty A. K., Tawfek A. A., Heat transfer due to round jet impinging normal to a flat surface. Int. J. Heat Mass Transfer, 1993, 36, 1639–1643 in Google Scholar

[9] Lytle D., Webb B. W., Air jet impingement heat transfer at low nozzle plate spacing. Int. J. Heat Mass Transfer, 1994, 37, 1687–1697 in Google Scholar

[10] Mi J., Nothan G. J., Nobers D. S., Mixing characteristics of axisymmetric free jets from a contoured nozzle, an orifice plate and a pipe, journal of fluids Engineering. Transactions of the ASME, 2001, 123, 878–883 in Google Scholar

[11] Baydar E., Ozmen Y., An experimental and numerical investigation on a confined impinging air jet at high Reynolds numbers. Applied thermal engineering, 2005, 25, 409–421 in Google Scholar

[12] Hofmann H. M., Kind M., Martin H., Measurements on steady heat transfer and flow structure and new correlations for heat band mass transfer to submerged impinging jet. Int. J. Heat Mass Transfer, 2007, 50, 3957–3965 in Google Scholar

[13] Zuckerman N., Lio N., Jet impingement heat transfer: physics, correlations, and numerical modelling. Advances in heat transfer, 2006, 39, 565–631 in Google Scholar

[14] Martin H., Heat and mass transfer between impinging gas jets and solid surfaces. Advances in heat transfer, 1977, 13, 1–60 in Google Scholar

[15] Nashino K., Samada M., Kasuya K., Torij K., Turbulence Statistics in the Stagnation Region of an Ax symmetric impinging Jet Flow. Int J. Heat and Fluid Flow, 1996, 17, 193–201 in Google Scholar

[16] Fleischer A. S., Nejad S. R., Jet impingement cooling of a discretely heated portion of a protruding pedestal with a single round air jet. Experimental thermal and fluid science, 2004, 28, 893–901 in Google Scholar

[17] Tu C. V., Wood D. H., Wall pressure and shear stress measurements beneath an impinging jet. Experimental thermal and fluid science, 2002, 25, 605–614 in Google Scholar

[18] Guo Y., Wood D. H., Measurement in the vicinity of stagnation point. Experimental thermal and fluid science, 1996, 13, 364–373 in Google Scholar

[19] Chougule N. K., Parishwad G. V., Gore P. R., Pagnis S., et al., CFD analysis of Multi-jet air Impingement on flat plate. Proceeding of the World Congress on Engineering, London, U.K., Vol. III, July 6–8, 2011 Search in Google Scholar

[20] Gao N., Sun H., Ewing D., Heat transfer to impinging round jets with triangular tabs. Int. J. Heat Mass Transfer, 2003, 46, 2557–2569 in Google Scholar

Published Online: 2013-7-28
Published in Print: 2013-9-1

© 2013 Versita Warsaw

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Downloaded on 23.2.2024 from
Scroll to top button