Heat and mass transfer and energy transport of integral radiation in light-scattering materials during exposure to diffuse and directional fluxes

1990 ◽  
Vol 58 (5) ◽  
pp. 657-661
Author(s):  
S. G. Il'yasov ◽  
N. I. Angersbakh ◽  
A. K. Angersbakh
Keyword(s):  
Mass Transfer ◽  
Light Scattering ◽  
Heat And Mass Transfer ◽  
Energy Transport ◽  
Integral Radiation

Dimensionless Groups and Simulations for Heat and Mass Transfer in Adsorbed Natural Gas Storage

2010 ◽  
Author(s):  
L. A. Sphaier
Keyword(s):  
Mass Transfer ◽  
Natural Gas ◽  
Heat And Mass Transfer ◽  
Energy Transport ◽  
Attractive Alternative ◽  
Compressed Natural Gas ◽  
Adsorbed Natural Gas ◽  
Heating Effects ◽  
Dimensionless Groups ◽  
Transfer Mechanisms

Adsorbed natural gas (ANG) has been emerging as an attractive alternative to compressed natural gas and liquefied natural gas, on various circumstances. In spite of the advantages associated with ANG over other storage modes, there are some issues that need be properly addressed in order to ensure a viable employment of such alternative. One major problem is that the thermal effects associated with the sorption phenomena tend to diminish the storage capacity, thereby resulting in poorer performance. Hence, in order to design commercially viable storage vessels, the heat and mass transfer mechanisms that occur in these devices must be carefully understood and controlled. In this context, this work presents different mathematical models for simulating ANG charge and discharge processes. For the sake of improving the understanding of mass and energy transport within ANG vessels, dimensionless groups associated with this problem are also discussed. By using the proposed formulations, simulation results were numerically calculated and the process of charging ANG vessels was analyzed for different combinations of the presented dimensionless groups. Pressure, temperature and stored mass histories are compared, showing that the unwanted heating effects can be minimized for certain values of the dimensionless groups. Finally, a comparison between the results obtained using the two different formulations suggests that there may be cases in which the simpler model could be employed.

Macroscale and Microscale Phenomena Encountered in Multiphase Energy Storage and Transport System

2010 ◽  
Author(s):  
Masahiro Kawaji
Keyword(s):  
Mass Transfer ◽  
Energy Storage ◽  
Heat And Mass Transfer ◽  
Phase Change Materials ◽  
Energy Transport ◽  
Ostwald Ripening ◽  
Heat Pipes ◽  
Heat Fluxes ◽  
Transport Systems ◽  
Enhancement Effect

Complex macroscale and microscale heat and mass transfer phenomena encountered in several thermal energy storage and transport systems are discussed. Thermal storage and transport systems involving ice slurries and nanoemulsions of phase change materials can be used for either cooling or heating applications or both, which can contribute to the reduced usage of electricity during peak hours. But heat and mass transfer and stability issues are encountered in the production, transport and storage of the heat storage media. Both the heat transfer enhancement effect and detrimental effects such as Ostwald ripening and supercooling will be discussed. Another interesting microscale phenomenon recently encountered in energy transport devices such as heat pipes is the enhancement of heat transport with the use of self-rewetting fluids. Critical heat fluxes in boiling can be enhanced by up to 300% and this helps prevent liquid dryout at high heat fluxes in different types of heat pipes. Both the nature of the enhancement effect and possible mechanisms will be discussed.

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