THERMAL SCIENCE

International Scientific Journal

ENHANCED HEAT TRANSFER CHARACTERISTICS OF CONJUGATED AIR JET IMPINGEMENT ON A FINNED HEAT SINK

ABSTRACT
Air jet impingement is one of the effective cooling techniques employed in micro-electronic industry. To enhance the heat transfer performance, a cooling system with air jet impingement on a finned heat sink is evaluated via the computational fluid dynamics method. A two-dimensional confined slot air impinging on a finned flat plate is modeled. The numerical model is validated by comparison of the computed Nusselt number distribution on the impingement target with published experimental results. The flow characteristics and heat transfer performance of jet impingement on both of smooth and finned heat sinks are compared. It is observed that jet impingement over finned target plate improves the cooling performance significantly. A dimensionless heat transfer enhancement factor is introduced to quantify the effect of jet flow Reynolds number on the finned surface. The effect of rectangular fin dimensions on impingement heat transfer rate is discussed in order to optimize the cooling system. Also, the computed flow and thermal fields of the air impingement system are examined to explore the physical mechanisms for heat transfer enhancement.
KEYWORDS
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 2015-02-05
PAPER ACCEPTED: 2015-03-08
PUBLISHED ONLINE: 2015-03-08
DOI REFERENCE: https://doi.org/10.2298/TSCI141229030Q
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE 1, PAGES [279 - 288]
REFERENCES
  1. Lasance, C., Simons, R.E., Advances in high-performance cooling for electronics, ElectronicsCooling, (2005), pp. 11.
  2. Lienhard, V.J.H., Liquid jet impingement, in: Annual Review of Heat Transfer (Ed. C.L. Tien), Begell Hourse, New York, 1995, pp. 199-270.
  3. Mujumdar, A.S., Impingement drying, in: Handbook of Industrial Drying (Ed. A.S. Mujumdar), Taylor & Francis Group, New York, 2007, pp. 385-395.
  4. Al-Hadhrami, L., et al., Heat transfer in a channel with inclined target surface cooled by single array of impinging jets, Proceedings of the ASME Turbo Expo, Montreal, Canada, 2007, Vol. 4A, pp. 35-42 .
  5. Al-Mubarak, A.A., et al., Impact of jet Reynolds number and feed channel geometry on heat transfer in a channel with inclined target surface cooled by single array of centered impinging jets with outflow in both directions, Proceedings of the World Congress on Engineering, London, U.K., 2011,Vol. III, pp.1495.
  6. Al Mubarak, A.A., et al., Heat transfer in a channel with inclined target surface cooled by single array of centered impinging jets, Thermal Science, 17 (2013), 4, pp.1195-1206.
  7. Lou, Z.W., et al., Effects of geometric parameters on confined impinging jet heat transfer, Applied Thermal Engineering, 25 (2005), 17-18, pp. 2687-2697.
  8. Sagot, B., et al., Enhancement of jet-to-wall heat transfer using axisymmetric grooved impinging plates, International Journal of Thermal Sciences, 49 (2010), 6, pp. 1026-1030,.
  9. Gau, C., Lee, I.C., Flow and impingement cooling heat transfer along triangular rib-roughened walls, International Journal of Heat and Mass Transfer, 43 (2000), 24, pp. 4405-4418.
  10. Yan, W., Mei, S., Measurement of detailed heat transfer along rib-roughened surface under arrays of impinging elliptic jets, International Journal of Heat and Mass Transfer, 49 (2006), 1-2, pp. 159-170.
  11. Katti, V., Prabhu, S.V., Heat transfer enhancement on a flat surface with axisymmetric detached ribs by normal impingement of circular air jet, International Journal of Heat and Fluid Flow, 29 (2008), 5, pp. 1279-1294.
  12. Tan, L., et al., Jet impingement on a rib-roughened wall inside semi-confined channel, International Journal of Thermal Sciences, 86 (2014), pp. 210-218.
  13. El-Sheikh, H.A., Garimella, S.V., Enhancement of air jet impingement heat transfer using pin-fin heat sinks, IEEE Transactions on Components and Packaging Technology, 23 (2000), 2, pp. 300-308.
  14. Caliskan, S., Baskaya, S., Experimental investigation of impinging jet array heat transfer from a surface with V-shaped and convergent-divergent ribs, International Journal of Thermal Sciences, 59 (2012), pp. 234-246.
  15. Caliskan, S., Flow and heat transfer characteristics of transverse perforated ribs under impingement jets, International Journal of Heat and Mass Transfer, 66 (2013), pp. 244-260.
  16. Maveety J.G., Jung, H.H., Design of an optimal pin-fin heat sink with air impingement cooling, International Communications in Heat and Mass Transfer, 27 (2000), 2, pp. 229-240.
  17. Jia, R., et al., Impingement cooling in a rib-roughened channel with cross-flow, International Journal of Numerical Methods for Heat & Fluid Flow, 11 (2001), 7, pp. 642-662.
  18. Sanyal, A., et al., Numerical study of heat transfer from pin-fin heat sink using steady and pulsated impinging jets, IEEE Transactions on Components and Packing Technology, 32 (2009), 4, pp.859-867.
  19. Xing, Y., et al., Experimental and numerical investigation of impingement heat transfer on a flat and micro-rib roughened plate with different cross flow schemes, International Journal of Thermal Sciences, 50 (2011), 7, pp.1293-1307.
  20. Spring, S., et al., An experimental and numerical study of heat transfer from arrays of impinging jets with surface ribs, ASME Journal of Heat Transfer, 134 (2012), pp. 082201.
  21. Huang, C.-H., et al., An impingement heat sink module design problem in determining optimal non-uniform fin widths, International Journal of Heat and Mass Transfer, 67 (2013), pp. 992-1006.
  22. Yakhot, A., Ozag, S.A., Renormalization group analysis of turbulence: I. Basic theory, Journal of Scientific Computing, 1 (1986), pp.1-51.
  23. Sharif, MAR, Mothe, K.K., Parametric study of turbulent slot-jet impingement heat transfer form concave cylindrical surfaces, International Journal of Thermal Science, 49 (2009), 2, pp.428-442.
  24. Parham, K., et al., A numerical study of turbulent opposed impinging jets issuing from triangular nozzles with different geometries, Heat and Mass Transfer, 47 (2011), pp.427-437.
  25. Xu, P., et al., Heat transfer under a pulsed slot turbulent impinging jet at large temperature differences, Thermal Science, 14 (2010), 1, 271-281.
  26. Garimella, S.V., Heat Transfer and flow fields in confined jet impingement, Annual Review of Heat Transfer, 11 (2000), pp.413-494.
  27. Katti, V., Prabhu, S.V., Experimental study and theoretical analysis of local heat transfer distribution between smooth flat surface and impinging air jet from a circular straight pipe nozzle, International Journal of Heat and Mass Transfer, 51 (2008), pp.4480-4495.

© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence