Fluid flow and mass transfer in a counter-current gas–liquid inclined tubes photo-bioreactor

2007 ◽  
Vol 62 (24) ◽  
pp. 7414-7425 ◽  
Author(s):  
J.C. Merchuk ◽  
Y. Rosenblat ◽  
I. Berzin
Keyword(s):  
Mass Transfer ◽  
Fluid Flow ◽  
Photo Bioreactor ◽  
Counter Current

scholarly journals A study of heat and mass transfer micropolar fluid flow near the stagnation regions of an object

2021 ◽  
pp. 101064
Author(s):  
T. Salahuddin ◽  
Mair Khan ◽  
Fahad S. Al-Mubaddel ◽  
Mohammad Mahtab Alam ◽  
Irfan Ahmad
Keyword(s):  
Mass Transfer ◽  
Fluid Flow ◽  
Heat And Mass Transfer ◽  
Micropolar Fluid ◽  
Micropolar Fluid Flow

scholarly journals Trace element catalyses mineral replacement reactions and facilitates ore formation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanlu Xing ◽  
Joël Brugger ◽  
Barbara Etschmann ◽  
Andrew G. Tomkins ◽  
Andrew J. Frierdich ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Trace Elements ◽  
Fluid Flow ◽  
Large Scale ◽  
Metal Accumulation ◽  
Nucleation And Growth ◽  
Reaction Interface ◽  
Ore Formation ◽  
Key Factor ◽  
Mineral Replacement

AbstractReaction-induced porosity is a key factor enabling protracted fluid-rock interactions in the Earth’s crust, promoting large-scale mineralogical changes during diagenesis, metamorphism, and ore formation. Here, we show experimentally that the presence of trace amounts of dissolved cerium increases the porosity of hematite (Fe2O3) formed via fluid-induced, redox-independent replacement of magnetite (Fe3O4), thereby increasing the efficiency of coupled magnetite replacement, fluid flow, and element mass transfer. Cerium acts as a catalyst affecting the nucleation and growth of hematite by modifying the Fe2+(aq)/Fe3+(aq) ratio at the reaction interface. Our results demonstrate that trace elements can enhance fluid-mediated mineral replacement reactions, ultimately controlling the kinetics, texture, and composition of fluid-mineral systems. Applied to some of the world’s most valuable orebodies, these results provide new insights into how early formation of extensive magnetite alteration may have preconditioned these ore systems for later enhanced metal accumulation, contributing to their sizes and metal endowment.

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