Mass Transfer Mechanisms in High-Performance Membrane Dialyzers

2011 ◽  
pp. 95-102 ◽  
Author(s):  
Akihiro C. Yamashita
Keyword(s):  
Mass Transfer ◽  
High Performance ◽  
Transfer Mechanisms

scholarly journals Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

AIChE Journal ◽  
2016 ◽  
Vol 63 (6) ◽  
pp. 2394-2408 ◽  
Author(s):  
Matthieu Roudet ◽  
Anne‐Marie Billet ◽  
Sébastien Cazin ◽  
Frédéric Risso ◽  
Véronique Roig
Keyword(s):  
Mass Transfer ◽  
Experimental Investigation ◽  
Reynolds Number ◽  
High Reynolds Number ◽  
Interfacial Mass Transfer ◽  
Bubble Rising ◽  
High Reynolds ◽  
Transfer Mechanisms

scholarly journals Desulfurization Behavior of Incoloy® 825 Superalloy by CaO-Al2O3-MgO-TiO2 Slag

2021 ◽  
Author(s):  
Jin Hyung Cho ◽  
Johan Martinsson ◽  
Du Sichen ◽  
Joo Hyun Park
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Nuclear Power ◽  
High Performance ◽  
Internal Combustion Engines ◽  
Sulfide Capacity ◽  
Metal Phase ◽  
High Temperature Strength ◽  
Desulfurization Rate

AbstractNi-based superalloy, which has excellent high-temperature strength and corrosion resistance, is mainly used in aviation materials, high-performance internal combustion engines, and turbines for thermal and nuclear power generation. For this reason, refining the impurities in Ni-based superalloys is a very important technical task. Nevertheless, the original technology for the melting and refining of Ni-based superalloys is still insufficient. Therefore, in this study, the effect of the CaO-Al2O3-MgO-TiO2 slag on the removal efficiency of an impurity element sulfur in Incoloy® 825 superalloy, one of the representative Ni-based superalloys, was investigated. The desulfurization behavior according to the change of TiO2 content and CaO/Al2O3 (=C/A, basicity) ratio as experimental variables was observed at 1773 K (1500 °C). Although the TiO2 content in the slag increases to 15 mass pct, the mass transfer coefficient of sulfur in molten alloy showed a constant value. Alternatively, under the condition of C/A > 1.0 of slag, the mass transfer coefficient of sulfur showed a constant value, whereas under the condition of C/A < 1.0, the mass transfer coefficient of sulfur greatly decreased as CaO decreased. Hence, in the desulfurization of Incoloy® 825 superalloy using the CaO-Al2O3-MgO-TiO2 slag, the TiO2 content in the slag does not have a considerable effect on the desulfurization rate and desulfurization mechanism (metal phase mass transfer controlled regime), but the basicity of the slag has a significant effect on desulfurization mechanism. When the slag basicity decreases below the critical level, i.e., C/A < 1.0, which is corresponding to sulfur distribution ratio, Ls < 200, it was confirmed that the desulfurization mechanism shifts from the metal phase mass transfer-controlled regime to the slag phase mass transfer-controlled regime due to the variation in the physicochemical properties of the slag such as viscosity and sulfide capacity. In addition, the different desulfurization rates between steel and Ni alloy melts were discussed by employing the diffusivity of sulfur in both systems.

Ostwald ripening in the presence of simultaneous occurrence of various mass transfer mechanisms: an extension of the Lifshitz–Slyozov theory

2021 ◽  
Vol 379 (2205) ◽  
pp. 20200308 ◽  
Author(s):  
Irina V. Alexandrova ◽  
Dmitri V. Alexandrov ◽  
Eugenya V. Makoveeva
Keyword(s):  
Mass Transfer ◽  
Distribution Function ◽  
Ostwald Ripening ◽  
Particle Radius ◽  
Simultaneous Occurrence ◽  
Asymptotic State ◽  
Initial Condition ◽  
Relaxation Dynamics ◽  
Link Type ◽  
Transfer Mechanisms

The Ostwald ripening stage of a phase transformation process with allowance for synchronous operation of various mass transfer mechanisms (volume diffusion and diffusion along the block boundaries and dislocations) and the initial condition for the particle-radius distribution function is theoretically studied. The initial condition is taken from the analytical solution describing the intermediate stage of a phase transition process. The present theory focuses on relaxation dynamics from the beginning of the ripening process to its final asymptotic state, which is described by the previously constructed theories (Slezov VV. et al. 1978 J. Phys. Chem. Solids 39 , 705–709. ( doi:10.1016/0022-3697(78)90002-1 ) and Alexandrov & Alexandrova 2020 Phil. Trans. R. Soc. A 378 , 20190247. ( doi:10.1098/rsta.2019.0247 )). An evolutionary behaviour of particle growth rates dependent on various mass transfer mechanisms and time is analytically described. The boundaries of the transition layer, which surround the blocking point, are found. The fundamental and relaxation contributions to the particle-radius distribution function are derived for the simultaneous occurrence of various mass transfer mechanisms. The left branch of this function is shifted to smaller particle radii whereas its right branch extends to the right of the blocking point as compared with the asymptotic universal distribution function. The theory under consideration well agrees with experimental data. This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.

scholarly journals Mass Transfer and Reaction Kinetic Enhanced Electrode for High‐Performance Aqueous Flow Batteries

2019 ◽  
Vol 29 (43) ◽  
pp. 1903192 ◽  
Author(s):  
Alolika Mukhopadhyay ◽  
Yang Yang ◽  
Yifan Li ◽  
Yong Chen ◽  
Hongyan Li ◽  
...  
Keyword(s):  
Mass Transfer ◽  
High Performance ◽  
Reaction Kinetic ◽  
Flow Batteries ◽  
Aqueous Flow
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