A theoretical analysis is performed to predict the effects of a fluid with temperature-dependent viscosity flowing through an isoflux-bounded porous medium channel. For validation purposes, the thermo-hydraulic behavior of this system is obtained also by solving numerically the differential balance equations. The conventional procedure for predicting the numerical pressure-drop along the channel by using the global Hazen-Dupuit-Darcy (HDD) model (also known as the Forchheimer-extended Darcy model), with a representative viscosity for the channel calculated at maximum or minimum fluid temperatures, is shown to fail drastically. Alternatively, new predictive theoretical global pressure-drop equations are obtained using the differential form of the HDD model, and validated against the numerical results. Heat transfer results from the new theory, in the form of Nusselt numbers, are compared with earlier results for Darcy flow models (with and without viscosity variation), and validated by using the numerical results. Limitations of the new theory are highlighted and discussed.
New Theory for Forced Convection Through Porous Media by Fluids With Temperature-Dependent Viscosity
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division September 29, 2000; revision received May 20, 2001. Associate Editor: J. Georgiadis.
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Narasimhan , A., Lage, J. L., and Nield, D. A. (May 20, 2001). "New Theory for Forced Convection Through Porous Media by Fluids With Temperature-Dependent Viscosity ." ASME. J. Heat Transfer. December 2001; 123(6): 1045–1051. https://doi.org/10.1115/1.1409268
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