Mixed convection in horizontal porous layers heated from below
- Columbia Univ., New York, NY (USA)
- Univ. of Delaware, Newark (USA)
Numerical studies are reported for steady, mixed convection in two-dimensional horizontal porous layer with localized heating from below. The interaction mechanism between the forced flow and the buoyant effects is examined for wide ranges of Rayleigh number Ra* and Peclet number Pe*. The external flow significantly perturbs the buoyancy-induced temperature and flow fields when Pe* is increased beyond unity. For a fixed Peclet number, an increase in Rayleigh number produces multicellular recirculating flows in a domain close to the heat source. This enhances heat transfer by free convection. However, for a fixed Ra*, an increase in forced flow or Peclet number does not necessarily increase the heat transfer rate. Hence, there exists a critical Peclet number as a function of Ra* for which the overall Nusselt number is minimum. The heat transfer is, generally, dominated by the buoyant flows for Pe* < 1 whereas the contribution of free convection is small for Pe* 10 when Ra* {le} 10.
- OSTI ID:
- 5488991
- Journal Information:
- Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 110:2; ISSN 0022-1481; ISSN JHTRA
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CONVECTION
ENERGY TRANSFER
GEOTHERMAL SYSTEMS
GEOTHERMAL WELLS
HEAT TRANSFER
INSTABILITY
MASS TRANSFER
MATERIALS
MATHEMATICS
NUMERICAL ANALYSIS
POROUS MATERIALS
RAYLEIGH-TAYLOR INSTABILITY
WELLS