Thermal Convection in Tilted Cylindrical Cavities Embedded in Rocks

Volume 1 ◽  
2004 ◽  
Author(s):  
F. Sa´nchez ◽  
A. Medina ◽  
F. J. Higuera
Keyword(s):  
Experimental Study ◽  
Thermal Convection ◽  
Cylindrical Cavity ◽  
Solid Rock ◽  
Saturated Porous Medium ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature ◽  
Fluid Saturated Porous Medium ◽  
Cylindrical Cavities ◽  
Temperature And Pressure

We present a theoretical and experimental study of the thermal convection in a fluid-filled, tilted cylindrical cavity and in a fluid-saturated porous medium filling a cylindrical cavity embedded in a solid slab (solid rock) which has a constant vertical temperature gradient far from the cavity. Closed-form, analytical solutions are obtained for the temperature field in the solid and for the velocity, temperature and pressure within the cavity.

Thermal Convection and Dispersion in Folded Gaps Embedded in Impervious Rocks

Volume 1 ◽  
2004 ◽  
Author(s):  
F. Sa´nchez ◽  
A. Medina ◽  
J. L. Montan˜es
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Thermal Convection ◽  
Taylor Dispersion ◽  
Vertical Temperature Gradient ◽  
Small Aspect Ratio ◽  
Dispersive Transport ◽  
Vertical Temperature ◽  
Convective Flows ◽  
Saturated Porous Layer

It is presented a numerical and experimental study related to thermal convection and Taylor dispersion in a symmetrical folded gap of small aspect ratio. The gap is surrounded by an impervious rock which is affected by a constant vertical temperature gradient. Two cases were analyzed, the fluid-filled gap and the fluid-saturated porous layer. Their corresponding convective flows were calculated for small Rayleigh number regimes. Taylor dispersion of a passive contaminant, in both cases, was studied. It was found that dispersion is strongly limited by the convective flows. Indeed, the Peclet number and the gap aspect ratio seem to be tight related to an eventually limited dispersive transport rate.

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