Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31097
Natural and Mixed Convection Heat Transfer Cooling of Discrete Heat Sources Placed Near the Bottom on a PCB

Authors: Tapano Kumar Hotta, S P Venkateshan


Steady state experiments have been conducted for natural and mixed convection heat transfer, from five different sized protruding discrete heat sources, placed at the bottom position on a PCB and mounted on a vertical channel. The characteristic length ( Lh ) of heat sources vary from 0.005 to 0.011 m. The study has been done for different range of Reynolds number and modified Grashof number. From the experiment, the surface temperature distribution and the Nusselt number of discrete heat sources have been obtained and the effects of Reynold number and Richardson number on them have been discussed. The objective is to find the rate of heat dissipation from heat sources, by placing them at the bottom position on a PCB and to compare both modes of cooling of heat sources.

Keywords: mixed convection, natural convection, Discrete heat source, vertical channel

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1748


[1] S. Baskaya, U. Erturhan, and M. Sivrioglu, "An experimental study on convection heat transfer from an array of discrete heat sources", .International Communications in Heat and Mass Transfer, 32 (1-2): 248- 257, 2005.
[2] H. Bhowmik, CP Tso, and KW Tou, "Analyses of convection heat transfer from discrete heat sources in a vertical rectangular channel", Journal of Electronic Packaging, 127: 215, 2005.
[3] CY Choi and SJ Kim, "Conjugate mixed convection in a channel: modified five percent deviation rule", International Journal of Heat and Mass Transfer, 39 (6):1223 - 1234, 1996.
[4] P.T.J.R. Culham and MM Yovanovich, "Comprehensive review of natural and mixed convection heat transfer models for circuit board arrays", Journal of Electronics Manufacturing, 7 (2):79-92, 1997.
[5] IA Ermolaev and AI Zhbanov, "Mixed convection in a horizontal channel with local heating from below", Fluid Dynamics, (1):29-35, 2004.
[6] B. Ghasemi and S.M. Aminossadati, "Numerical simulation of mixed convection in a rectangular enclosure with different numbers and arrangements of discrete heat sources", Arabian Journal for Science and Engineering, 33 (1):189, 2008.
[7] G.G. Kumar and C.G. Rao, "Interaction of surface radiation with conjugate mixed convection from a vertical plate with multiple non identical discrete heat sources", Chemical Engineering Communications, 198 (5): 692-710, 2011.
[8] La Pica, G. Rodonn, and R. Volpes, "An experimental investigation on natural convection of air in a vertical channel", International Journal of Heat and Mass Transfer, 36 (3):611-616, 1993.
[9] S. Lee, JR Culham, and MM Yovanovich, "Parametric investigation of conjugate heat transfer from microelectronic circuit boards under mixed convection cooling", International electronic packaging conference, San Diego, September, pages 15 - 19, 1991.
[10] G.M. Rao and G. Narasimham, "Laminar conjugate mixed convection in a vertical channel with heat generating components", International Journal of Heat and Mass Transfer, 50 (17-18):3561-3574, 2007.
[11] SM Sawant and C. Gururaja Rao, "Conjugate mixed convection with surface radiation from a vertical electronic board with multiple discrete heat sources", Heat and Mass Transfer, 44 (12):1485-1495, 2008.
[12] H. Turkoglu and N. Yucel, "Mixed convection in vertical channels with a discrete heat source", Heat and Mass Transfer, 30 (3):159-166, 1995.
[13] T.V.V. Sudhakar, A. Shori, C. Balaji, and S.P. Venkateshan.,"Optimal heat distribution among discrete protruding heat sources in a vertical duct: A combined numerical and experimental study", Journal of Heat Transfer, 132 : 011401, 2010.
[14] S. P. Venkateshan, "Mechanical Mesurements", Ane Books, New Delhi, India, 2008.