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Lateral intrusion of natural convection into a horizontal porous structure

Journal Article · · J. Heat Transfer; (United States)
DOI:https://doi.org/10.1115/1.3244447· OSTI ID:6165779
The fundamental features are illustrated of lateral penetration of natural convection into a horizontal porous layer in lateral communication with a heat reservoir. It is found that the important group governing the fluid mechanics of the phenomenon is the Darcy-modified Rayleigh number RA based on longitudinal (horizontal) permeability and on transversal (vertical) thermal diffusivity. It is shown that the buoyancy-driven flow has flattened c-shaped streamlines and isotherms. The flow penetrates laterally to a distance of order H RA 1/2, where H is the height of the porous layer. The net heat exchange between the porous structure and the lateral heat reservoir is described by a Nusselt number result of the type NU approximately = RA 1/2. The effect of horizontal wall temperature gradient on penetration length and heat transfer is discussed. The engineering importance of these findings is illustrated by examples related to the conceptual design of porous winding structures for rotating superconducting electric machines. 13 references.
OSTI ID:
6165779
Journal Information:
J. Heat Transfer; (United States), Journal Name: J. Heat Transfer; (United States) Vol. 103:2; ISSN JHTRA
Country of Publication:
United States
Language:
English

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CONVECTION
DARCY LAW
ENERGY
ENERGY SOURCES
ENERGY TRANSFER
ENHANCED RECOVERY
FLUID FLOW
FLUID INJECTION
FLUID MECHANICS
FLUIDS
GASES
GEOTHERMAL ENERGY
HEAT TRANSFER
MASS TRANSFER
MATERIALS
MECHANICS
NUSSELT NUMBER
PERMEABILITY
PHYSICAL PROPERTIES
POROUS MATERIALS
RECOVERY
RENEWABLE ENERGY SOURCES
STEAM INJECTION
THERMAL DIFFUSIVITY
THERMAL RECOVERY
THERMODYNAMIC PROPERTIES
VAPORS
WATER VAPOR