Numerical and Experimental Investigations on Jet Impingement Cooling

Authors: Arun Jacob, Leena R., Krishnakumar T.S., Jose Prakash M.

Abstract:

Effective cooling of electronic equipment has emerged as a challenging and constraining problem of the new century. In the present work the feasibility and effectiveness of jet impingement cooling on electronics were investigated numerically and experimentally. Studies have been conducted to see the effect of the geometrical parameters such as jet diameter (D), jet to target spacing (Z) and ratio of jet spacing to jet diameter (Z/D) on the heat transfer characteristics. The values of Reynolds numbers considered are in the range 7000 to 42000. The results obtained from the numerical studies are validated by conducting experiments. From the studies it is found that the optimum value of Z/D ratio is 5. For a given Reynolds number, the Nusselt number increases by about 28% if the diameter of the nozzle is increased from 1mm to 2mm. Correlations are proposed for Nusselt number in terms of Reynolds number and these are valid for air as the cooling medium.

Keywords: CFD, heat transfer coefficient, Nusselt number, ratio of jet diameter to jet spacing (Z/D), Reynolds number, turbulence model.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1060421

References:

[1] X. Liu, V.J.H. Lienvard, and J.S. Lombara, "Convective heat transfer by impingement of circular liquid jets", J. Heat Transfer vol.113, 1991, pp. 571 - 582.
[2] J.W. Baughn, A.E. Hechanova and X. Yan, "An experimental study of entrainment effects on the heat transfer from a flat surface to a heated circular impinging jet", J. Heat Transfer vol. 113,1991, pp. 1023 - 1025.
[3] K Jambunathan, E. Lai, M.A. Moss and B.L. Button, "A review of heat transfer data for single circular jet impingement", Int.J.Heat Fluid Flow vol.13, 1992, pp. 106 - 115.
[4] R. Viskanta, "Heat transfer to impinging isothermal gas and flame jets". Exp. Therm. Fluid Sci.vol.6, 1993, pp. 111-134.
[5] D. Lytle and B.W. Webb, "Air jet impingement heat transfer at low nozzle-plate spacing-s", Int. J. Heat Mass Transfer, vol.37, 1994, pp. 1687 - 1697.
[6] S.V. Garimella, "Heat transfer & flow fields in confined jet impingement", Ann. Rev. Heat Transfer, vol.11, 1999, pp.413 - 494 ch.7.
[7] I. Sezai and A.A. Mohamed, "Three dimensional simulations of laminar rectangular impinging jets, flow structure and heat transfer", ASME J. Heat Transfer, vol.121, 1999, pp.50 - 56.
[8] S.Z. Shuja, B.S. Yilbas, and M. Rashid, "Confined swirling jet impingement onto anadiabatic wall", Int. J. Heat Mass Transfer, vol. 46, 2003, pp. 2947 - 2955.
[9] Juan.T, Jie-min.Z, Li.J and Ying. Y " Experimental research on heat transfer of confined air jet impingement with tiny size round nozzle in high density electronics packaging model", ieeeexplore.com,2005.
[10] H.G. Lee, H.S. Yoon and M.Y. H, "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", International Journal of Heat and Mass Transfer, vol. 51, 2008, pp. 4055 - 4068.
[11] Yahya Erkan Akansu, Mustafa Sarioglu , Kemal Kuvvet B and Tahir Yavuz, "Flow field and heat transfer characteristics in an oblique slot jet impinging on a flat plate", International Communications in Heat and Mass Transfer, vol. 35, 2008, pp. 873 - 880.