Multizone Porous Medium Model of Thermal/Fluid Processes During Discharge of an Inclined Rectangular Storage Vessel Via an Immersed Heat Exchanger

2007 ◽  
Vol 129 (4) ◽  
pp. 449-457 ◽  
Author(s):  
Yan Su ◽  
Jane H. Davidson
Keyword(s):  
Porous Medium ◽  
Heat Exchanger ◽  
Storage Tank ◽  
Transient Temperature ◽  
Width Ratio ◽  
Dimensional Model ◽  
Temperature Distributions ◽  
Wide Range ◽  
Convective Thermal ◽  
Porous Medium Model

The transient natural convective thermal/fluid processes during discharge of an inclined rectangular solar storage tank via an immersed heat exchanger are modeled and compared to prior experimental data. The model treats the heat exchanger as a porous medium within the storage fluid and is applicable to a wide range of tank/heat exchanger configurations. In the present study, a two-dimensional model is applied to discharge of a 126l storage tank inclined at 30deg with respect to the horizontal and with a height to width ratio of 9:1. The heat exchanger has 240 tubes arranged in parallel and is located near the top of the tank. Transient temperature distributions and flow streamlines demonstrate the complexity of the flow field and the extent of mixing during discharge. The predicted results compare favorably to prior measurements of heat transfer and temperature distribution.

The Transient Temperature Distribution in a Slab Subject to Thermal Radiation

1965 ◽  
Vol 87 (1) ◽  
pp. 117-130 ◽  
Author(s):  
R. D. Zerkle ◽  
J. Edward Sunderland
Keyword(s):  
Temperature Distribution ◽  
Thermal Radiation ◽  
Radiant Heat ◽  
Analog Computer ◽  
Graphical Form ◽  
Transient Temperature ◽  
Transient Temperature Distribution ◽  
Temperature Distributions ◽  
Approximate Analytical Solutions ◽  
Wide Range

The transient, one-dimensional temperature distribution is determined for a slab, insulated on one face, and subjected to thermal radiation at the other face. The slab is initially at a uniform temperature and is assumed to be homogeneous, isotropic, and opaque; the physical properties are assumed to be independent of temperature. Transient temperature distributions for both heating and cooling situations are obtained by means of a thermal-electrical analog computer. A diode limiter circuit is used to simulate the nonlinear radiant heat flux. The transient temperature distributions are presented in a dimensionless, graphical form for a wide range of variables. Approximate analytical solutions are also given which complement and extend the solution charts over ranges of parameters not covered in the charts.

Transport of Gaseous 14C in a Partially Saturated, Fractured, Porous Medium

1989 ◽  
Vol 176 ◽  
Author(s):  
W. B. Light ◽  
P. L. Chambré ◽  
W. W.-L. Lee ◽  
T. H. Pigford
Keyword(s):  
Porous Medium ◽  
Nuclear Waste ◽  
Ground Surface ◽  
Yucca Mountain ◽  
Nuclear Waste Repository ◽  
Release Rates ◽  
Partially Saturated ◽  
Wide Range ◽  
Waste Repository ◽  
Porous Medium Model

ABSTRACTWe predict the transport of 14C from the proposed nuclear waste repository at Yucca Mountain using a porous medium model. Use of this model is justified if the Peclet number, which indicates equilibrium between gas in fractures and liquid in rock pores, is much less than unity. For the assumed release rates, maximum predicted concentrations of 14CO2 in rock near the ground surface are comparable to the USNRC limit for unrestricted areas. Furthermore, dilution near the ground surface as the 14CO2 enters the atmosphere will lower the concentrations by several orders of magnitude. Travel times from the repository to the surface are predicted to be hundreds to thousands of years. For a wide range of the parameters, the release rate from the source has negligible effect on the maximum concentrations at the ground surface.

Physical model of porous medium with controlled permeability based on PDMS

2016 ◽  
Vol 11 (1) ◽  
pp. 94-99
Author(s):  
S.P. Sametov
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Physical Model ◽  
Relative Permeability ◽  
Medium Model ◽  
Wide Range ◽  
Permeability For Water ◽  
Porous Medium Model

For filtration studies in a wide range of permeability a model of porous medium was used a porous cross-linked polymer polydimethylsiloxane. Its permeability and porosity is well-controlled in a range of 0.1–30 000 mD. In the work several samples of porous media with various permeability are presented. Obtained minimal relative permeability for water is order of 1 mD in the porous medium model.

One-dimensional model of a stratified thermal storage tank with supercritical coiled heat exchanger

2018 ◽  
Vol 134 ◽  
pp. 379-395 ◽  
Author(s):  
Pierre-Luc Paradis ◽  
Daniel R. Rousse ◽  
Louis Lamarche ◽  
Hakim Nesreddine ◽  
Marie-Hélène Talbot
Keyword(s):  
Heat Exchanger ◽  
Storage Tank ◽  
Thermal Storage ◽  
Dimensional Model ◽  
One Dimensional

A Porous Medium Model of Alveolar Gas Diffusion

1999 ◽  
Vol 2 (3) ◽  
pp. 263-275 ◽  
Author(s):  
Vladimir Koulich ◽  
Jose L. Lage ◽  
Connie C. W. Hsia ◽  
Robert L. Johnson, Jr.
Keyword(s):  
Porous Medium ◽  
Gas Diffusion ◽  
Medium Model ◽  
Porous Medium Model
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