Fig. 1.
(Color online) (a) Externally and (b) internally finned heat sinks.
DownLoad:
| Citation: |
Bin Li, Lun Xiong, Chuan Lai, Yumei Tang. Investigation of internally finned LED heat sinks[J]. Journal of Semiconductors, 2018, 39(3): 034002. doi: 10.1088/1674-4926/39/3/034002
****
B Li, L Xiong, C Lai, Y M Tang. Investigation of internally finned LED heat sinks[J]. J. Semicond., 2018, 39(3): 034002. doi: 10.1088/1674-4926/39/3/034002.
|
Investigation of internally finned LED heat sinks
DOI: 10.1088/1674-4926/39/3/034002
More Information
-
Abstract
A novel heat sink is proposed, which is composed of a perforated cylinder and internally arranged fins. Numerical studies are performed on the natural convection heat transfer from internally finned heat sinks; experimental studies are carried out to validate the numerical results. To compare the thermal performances of internally finned heat sinks and externally finned heat sinks, the effects of the overall diameter, overall height, and installation direction on maximum temperature, air flow and heat transfer coefficient are investigated. The results demonstrate that internally finned heat sinks show better thermal performance than externally finned heat sinks; the maximum temperature of internally finned heat sinks decreases by up to 20% compared with the externally finned heat sinks. The existence of a perforated cylinder and the installation direction of the heat sink affect the thermal performance significantly; it is shown that the heat transfer coefficient of the heat sink with the perforated cylinder is improved greater than that with the imperforated cylinder by up to 34%, while reducing the mass of the heat sink by up to 13%.-
Keywords:
- radial heat sink,
- natural convection,
- perforated cylinder
-
References
[1] Yue T Y, Huan S P. Investigation of planted pin fins for heat transfer enhancement in plate fin heat sink. Microelectron Reliab, 2009, 49: 163 doi: 10.1016/j.microrel.2008.11.011[2] Tae H K, Dong K K, Kyu H D. Correlation for the fin Nusselt number of natural convection heat sinks with vertically oriented plate-fins. Heat Mass Transfer, 2013, 49: 413 doi: 10.1007/s00231-012-1100-0[3] Seung H Y, Kwan S L, Sejin Y. Natural convection around a radial heat sink. Int J Heat Mass Transfer, 2010, 53: 2935 doi: 10.1016/j.ijheatmasstransfer.2010.02.032[4] Bin L, Chan B. Investigation of natural convection heat transfer around a radial heat sink with a concentric ring. Int J Heat Mass Transfer, 2015, 89: 159 doi: 10.1016/j.ijheatmasstransfer.2015.04.106[5] Daeseok J, Seung H Y, Kwan S L. Multidisciplinary optimization of a pin-fin radial heat sink for LED lighting applications. Int J Heat Mass Transfer, 2012, 55: 515 doi: 10.1016/j.ijheatmasstransfer.2011.11.016[6] Seung H Y, Kwan S L, Sejin Y. Optimum design of a radial heat sink under natural convection. Int J Heat and Transfer, 2011, 54: 2499 doi: 10.1016/j.ijheatmasstransfer.2011.02.012[7] Byoung H A, Hyun J K, Dong K K. Nusselt number correlation for natural convection from vertical cylinders with vertically oriented plate fins. Exp Therm Fluid Sci, 2012, 41: 59 doi: 10.1016/j.expthermflusci.2012.03.010[8] Daeseok J, Seung J P, Sejin Y, et al. The orientation effect for cylindrical heat sinks with application to LED light bulbs. Int J Heat and Transfer, 2014, 71(3): 496[9] Hu M H, Chang Y P. Optimization of finned tubes for heat transfer in laminar flow. J Heat Transfer, 1973, 95: 332 doi: 10.1115/1.3450060[10] Soliman H M. The effect of fin conductance on laminar heat transfer characteristics of internally finned tubes. Can J Chem Eng, 2009, 59: 251[11] Prakash C, Liu Y D. Buoyancy induced flow in a vertical internally finned circular duct. J Heat Transfer, 1985, 107: 118 doi: 10.1115/1.3247366[12] Bin L, Young J B, Chan B. Enhanced natural convection heat transfer of a chimney-based radial heat sink. Energy Conv Manage, 2016, 108: 422 doi: 10.1016/j.enconman.2015.11.037[13] Young H J, Sung J K. Thermal optimization of vertically oriented, internally finned tubes in natural convection. Int J Heat Transfer, 2016, 93: 991 doi: 10.1016/j.ijheatmasstransfer.2015.10.034[14] Qie S, Daming S, Ya X, et al. Orientation effects on natural convection heat dissipation of rectangular fin heat sinks mounted on LEDs. Int J Heat Transfer, 2014, 75: 462 doi: 10.1016/j.ijheatmasstransfer.2014.03.085[15] Bin L, Sora J, Chan B. Investigation of natural convection heat transfer around a radial heat sink with a perforated ring. Int J Heat Transfer, 2016, 97: 705 doi: 10.1016/j.ijheatmasstransfer.2016.02.058 -
Proportional views
