The flow modeling approaches employed in computational fluid dynamics (CFD) codes dedicated to the thermal analysis of electronic equipment are generally not specific for the analysis of forced airflows over populated electronic boards. This limitation has been previously highlighted (Eveloy, V. et al., 2004, IEEE Trans. Compon., Packag., Technol. 27, pp. 268–282), with component junction temperature prediction errors of up to 35% reported. This study evaluates the potential of three candidate low-Reynolds number eddy viscosity turbulence models to improve predictive accuracy. An array of fifteen board-mounted PQFPs is analyzed in a 4 m/s airflow. Using the shear stress transport model, significant improvements in component junction temperature prediction accuracy are obtained relative to the standard high-Reynolds number model, which are attributed to better prediction of both board leading edge heat transfer and component thermal interaction. Such improvements would enable parametric analysis of product thermal performance to be undertaken with greater confidence in the thermal design process, and the generation of more accurate temperature boundary conditions for use in Physics-of-Failure based reliability prediction methods. The case is made for vendors of CFD codes dedicated to the thermal analysis of electronics to consider the adoption of eddy viscosity turbulence models more suited to board-level analysis.
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March 2005
Article
An Investigation Into the Potential of Low-Reynolds Number Eddy Viscosity Turbulent Flow Models to Predict Electronic Component Operational Temperature
Peter Rodgers,
Peter Rodgers
CALCE Electronic Products and Systems Center, University of Maryland, College Park, MD 20742
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Vale´rie Eveloy,
Vale´rie Eveloy
CALCE Electronic Products and Systems Center, University of Maryland, College Park, MD 20742
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M. S. J. Hashmi
M. S. J. Hashmi
Dublin City University, School of Mechanical and Manufacturing Engineering, Dublin 9, Ireland
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Peter Rodgers
CALCE Electronic Products and Systems Center, University of Maryland, College Park, MD 20742
Vale´rie Eveloy
CALCE Electronic Products and Systems Center, University of Maryland, College Park, MD 20742
M. S. J. Hashmi
Dublin City University, School of Mechanical and Manufacturing Engineering, Dublin 9, Ireland
Manuscript received June 29, 2003; revision received June 27, 2004. Review conducted by: B. Sammakia.
J. Electron. Packag. Mar 2005, 127(1): 67-75 (9 pages)
Published Online: March 21, 2005
Article history
Received:
June 29, 2003
Revised:
June 27, 2004
Online:
March 21, 2005
Citation
Rodgers, P., Eveloy, V., and Hashmi, M. S. J. (March 21, 2005). "An Investigation Into the Potential of Low-Reynolds Number Eddy Viscosity Turbulent Flow Models to Predict Electronic Component Operational Temperature ." ASME. J. Electron. Packag. March 2005; 127(1): 67–75. https://doi.org/10.1115/1.1849234
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