Heat Transfer Characteristic Analysis of Confined Impinging Jet Cooling System with Micro-Scale Round Nozzles

Abstract:

In order to investigate the heat transfer of confined impinging jet with tiny size round nozzle, a bakelite laminate was used as the heat transfer surface of simulated chip. The thermocouples were mounted symmetrically along the diagonal of the laminate to measure the temperature distribution of the surface. The parameters such as Reynolds number (Re) and ratio of height-to-diameter were changed to investigate the radial distribution of Nu and the characteristics of heat transfer in stagnant section. The results show that hear transfer coefficient at stagnation point is maximal. It is decreased with the increases of the radial jet distance, but increased with Re and impinging height. Moreover, the effect of single-nozzle type is stronger than that of multi-nozzle type in the cases of same air flow. These studies will give a way for the application of air jet impingement in the electronics chip cooling.

• Periodical: Advanced Materials Research (Volumes 171-172)
• Pages: 799-803
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.171-172.799
• Online since: December 2010
• Authors: Chang Hong Wang, Ying Chen, Juan Tu
• Keywords: Confined Air Jet, Enhanced Heat Transfer, Nusselt Number (Nu), Stagnant Point

References

[1] J. Peter Krusius, Che-Yu Li. Research Summarize of Electronics Packaging. Micro-electronics Technology, 1996, 24(5): 41-46.

[2] Tian M B, Lin J D, Zhu D T. Substrates for high density package [M]. Beijing: Tsinghua University Press, 2003: 155–185, 711–713.

[3] Harper C A. Electronic assembly fabrication [M]. Beijing: Science Press, 2003: 62–66.

[4] Lu Y C, Yang S G. A review of thermal analysis, thermal design and thermal test technology and their recent development [J]. Journal of Electro-Mechanical Engineering, 2007, 23(1): 5–10.

[5] Zhang S P, Zhen H Y. The New Evolve of Electronics Packaging Technology. Electron and Packaging, 2004, 4(1): 3-9.

[6] Xu J L, Xu Zhong, Gao Min, Huang S J. Research Summarize of Impinging Jet. Mechanics and Practice, 1999, 21: 8-17.

[7] Jambunathan K, Lai E, Moss M A, et al. A review of heat transfer data for single circular jet impingement. Int J Heat and Fluid flow, 1992, 13(2): 1105-1108.

DOI: 10.1016/0142-727x(92)90017-4

[8] Ashforth-frost S, Jambunathan. Numerical Prediction of Semi-confined Jet Impingement and Comparison with Experiment Data. Int J Numerical methods in Fluids, 1996, 23: 295.

DOI: 10.1002/(sici)1097-0363(19960815)23:3<295::aid-fld425>3.0.co;2-t

[9] Goldstein R J, Franchett M E. Heat transfer from a flat surface to an oblique impinging jet. Trans ASME J Heat Transfer, 1988, 110: 84.

DOI: 10.1115/1.3250477

[10] Chen Y C, Ma C F, Lei D H. Experimental Study on Heat Transfer Enhancement of Air Jet Impingement with Extremely Small Size Round Nozzle. Journal of Beijing University of Technology, 2000, 26(4): 5-8.

[11] K. R. Saripalli. Visualization of Multi-jet Impingement Flow, AIAA J. 1983, 21(4): 483-484.