Mixed convection in a liquid-saturated porous medium
An experimental and numerical investigation of mixed convection phenomena about a finite-length, vertical, cylindrical heat source in a unfiorm, liquid-saturated, porous medium was conducted. Bouyancy-induced upflow about the heat source was systematically altered by the superposition of vertical, pressure-driven flows which opposed the bouyancy-induced fluid motion. The evolution of the mixed convection velocity and thermal fields with increasing magnitude of the imposed-flow Peclet number are reported. The ratio of the natural convection Rayleigh number Ra to the imposed-flow Peclet Number Pa is shown to be the nondimensional parameter that characterizes the relative influence of buoyancy-induced to pressure-driven fluid motion. Using total disappearance of buoyancy-induced upflow as the criterion, the transition from mixed to forced convection, for opposing flows, is numerically predicted to occur for )vertreverse arrowbar) Ra/Pe )vertreverse arrowbar)approx. =1/2, independent of the heat source length or power input.
- Research Organization:
- Sandia National Laboratories, Albuquerque, NM 87185
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5353323
- Journal Information:
- J. Heat Transfer; (United States), Journal Name: J. Heat Transfer; (United States) Vol. 110:1; ISSN JHTRA
- Country of Publication:
- United States
- Language:
- English
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