Heat Transfer Analysis for Line-Finned Heat Sink with Vertical Passages

Abstract:

Using heat sink to increase the cooling area is the most familiar and fundamental method in LED heat management technology. We develop a new configuration of finned heat sink for LED lamp. It is a circular cylinder with many plate fins radially arranged on the external surface. There are many straight ducts inside the peripheral wall of the cylinder. These ducts form the chimney effect to enhance the heat transfer. This work experimentally investigated the chimney effect on the heat transfer characteristics of the finned heat sink under the free convection state. The aluminum-alloy plate spreader with two vertical plate fins was selected as the control group. The experimental group was the heat sink having the same configuration of the control group but had a vertical passage within the spreader. The results show that the vertical passage did strengthen 8.3~12.1% free convection performance for the present test heat sink.

• Periodical: Applied Mechanics and Materials (Volumes 764-765)
• Pages: 300-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.764-765.300
• Online since: May 2015
• Authors: Tzer Ming Jeng*, Sheng Chung Tzeng, Po Tsun Chen, Wei Kai Huang
• Keywords: Experiment, Finned Heat Sink, Free Convection, Vertical Passage

References

[1] Welling, J.R. & Wooldridge, C.B.: 1965. Free convection heat transfer coefficients from rectangular vertical fins. Trans. ASME J. Heat Transfer 87 (3): 439-444.

DOI: 10.1115/1.3689135

[2] Mendez, F. & Trevino, C.: 2000. The conjugate conduction-natural convection heat transfer along a thin vertical plate with non-uniform internal heat generation. Int. J. Heat Mass Transfer 43: 2739-2748.

DOI: 10.1016/s0017-9310(99)00331-2

[3] Maranzana, G., Didierjean, S., Remy, B. & Maillet, D.: 2002. Experimental estimation of the transient free convection heat transfer coefficient on a vertical flat plate in air. Int. J. Heat Mass Transfer 45: 3413-3427.

DOI: 10.1016/s0017-9310(02)00049-2

[4] Polidori, G. & Padet, J.: 2003. Transient free convection flow on a vertical surface with an array of large-scale roughness elements. Experimental Thermal and Fluid Science 27: 251-260.

DOI: 10.1016/s0894-1777(02)00296-0

[5] Cianfrini, C., Corcione, M. & Habib, E.: 2006. Free convection heat transfer from a horizontal cylinder affected by a downstream parallel cylinder of different diameter. Int. J. Thermal Sciences 45: 923-931.

DOI: 10.1016/j.ijthermalsci.2005.11.008

[6] Mobedi, M. & Sunden, B.: 2006. Natural convection heat transfer from a thermal heat source in a vertical plate fin. Int. Comm. Heat Mass Transfer 33: 943-950.

DOI: 10.1016/j.icheatmasstransfer.2006.04.005

[7] Kasayapanand, N. & Kiatsiriroat, T.: 2007. Numerical modeling of the electrohydrodynamic effect to natural convection in vertical channels. Int. Comm. Heat Mass Transfer 34: 162-175.

DOI: 10.1016/j.icheatmasstransfer.2006.10.005

[8] Yilmaz, T. & Fraser, S. M.: 2007. Turbulent natural convection in a vertical parallel-plate channel with asymmetric heating. Int. J. Heat Mass Transfer 50: 2612-2623.

DOI: 10.1016/j.ijheatmasstransfer.2006.11.027

[9] Haldar, S. C.: 2010. Natural convection about a cylindrical pin element on a horizontal plate. Int. J. Thermal Sciences 49: 1977-(1983).

DOI: 10.1016/j.ijthermalsci.2010.06.006

[10] Ellison, G.N.: 1984. Thermal computations for electronic equipment. Van Nostrand Reinhold Company, New York, 29-45.

[11] Moffat, R.J.: 1982. Contributions to the theory of single-sample uncertainty analysis. ASME J. Fluids Engineering 104: 250-258.

DOI: 10.1115/1.3241819