Optimal performance of an endoreversible three-mmass-reservoir chemical potential transformer with diffusive mass transfer law

2008 ◽  
Vol 29 (1) ◽  
pp. 9-16 ◽  
Author(s):  
D. Xia ◽  
L. Chen ◽  
F. Sun ◽  
C. Wu





Author(s):  
L Chen ◽  
D Xia ◽  
F Sun

The performance of an isothermal endoreversible chemical engine, in which the mass transfer obeys diffusive law, is analysed and optimized in this paper. The analytical relations about power output and efficiency, as well as the optimal relation between the power output and efficiency of the isothermal chemical engine are derived by using finite-time thermodynamics. Moreover, the optimal operating regions are studied. The results obtained herein can provide some new theoretical guidelines for the optimal design and development of a class of chemical engines.





2020 ◽  
Author(s):  
Alissar Yehya ◽  
James R. Rice

<p>Micro-cracks in fault damage zones can heal through diffusive mass transfer driven by differences in chemical potential, with rates controlled by temperature and pressure. The diffusion of pore fluid pressure in fault damage zones accelerates mass diffusion and assists healing processes. In this work, we use fluid flow model coupled with heat transfer and crack healing to investigate, through different scenarios, the role of subsurface warm fluid migration, along damage zones, in enhancing healing and re-shaping the fault permeability structure. Our results show that if the flow communication exists between the bed and only one side of the damage zone and not the other side, it leads to an asymmetric permeability structure caused by healing in the side circulated by fluids (ex: Rapolano geothermal area, Italy). Another scenario is when the damage zone adjacent to the fault core is not the interval with the highest permeability, as conventionally expected, which is the case of the Alpine Fault, New Zealand. As shown by our simulations, this can be due to healing by diffusive mass transfer, favored by the localized high geothermal gradients and the upward fluid migration through the fault relay structure.</p>





1978 ◽  
Vol 125 (7) ◽  
pp. 489-525 ◽  
Author(s):  
Ya.E. Geguzin ◽  
Yu.S. Kaganovskii


Fuel ◽  
2019 ◽  
Vol 235 ◽  
pp. 1327-1336 ◽  
Author(s):  
Kiarash Keshmiri ◽  
Mohammad Pourmohammadbagher ◽  
Haibo Huang ◽  
Neda Nazemifard


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