scholarly journals Comparison of Mass Transfer Coefficient Approach and Nernst–Planck Formulation in the Reactive Transport Modeling of Co, Ni, and Ag Removal by Mixed-Bed Ion-Exchange Resins

2014 ◽  
Vol 53 (27) ◽  
pp. 11096-11106 ◽  
Author(s):  
Martin Bachet ◽  
Loïc Jauberty ◽  
Laurent De Windt ◽  
Etienne Tevissen ◽  
Caroline de Dieuleveult ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Reactive Transport ◽  
Transport Modeling ◽  
Ion Exchange Resins ◽  
Reactive Transport Modeling ◽  
Mixed Bed Ion Exchange ◽  
Exchange Resins

Temperature Dependencies of Inter-Diffusion Coefficient and Mass-Transfer Coefficient of Chemical Strengthening

2016 ◽  
Vol 702 ◽  
pp. 32-36
Author(s):  
Maya Hatano ◽  
Satoshi Kanasugi ◽  
Masaaki Konishi
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Ion Exchange ◽  
Simulation Model ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Compressive Stress ◽  
Parameter Study ◽  
Fictive Temperature ◽  
Chemical Strengthening

Chemical strengthening is a method of generating compressive stress on the glass surfaces by ion-exchange to improve their strengths since old ages. As its targets have been expanding to larger and thinner glasses recently, different strength profiles are required depending on the applications and selecting appropriate ion-exchange parameters becomes even more important. Therefore, we developed a simulation model of chemical strengthening which enables predicting the stress profiles by ion-exchange in order to help optimizing the ion-exchanging parameters. Parameter study using the simulation model with change of temperature results in precise stress prediction, the compressive stress on the surface with a margin of error of ± 3% and the depth of layer with that of ± 10%. Furthermore, the parameter study introduced following two technical findings; (1) both inter-diffusion coefficient and mass-transfer coefficient could obey the Arrhenius equation, (2) both actual temperature and fictive temperature could influence on the stress relaxation. These findings are of great importance in comprehending the phenomena associated with ion-exchange. It has possibilities for beneficial feedback to the composition development and optimum stress design in accordance with each application.

A Mass Transfer Coefficient for Radial Flow Adsorption and Ion Exchange

2012 ◽  
Vol 51 (3) ◽  
pp. 1429-1434
Author(s):  
Dennis F. Hussey ◽  
Ashwini K. Pandey ◽  
Gary L. Foutch
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Radial Flow
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