Porous membrane cleaning using supercritical carbon dioxide. Part 2: Development of mathematical model and CFD simulations

2018 ◽  
Vol 136 ◽  
pp. 1-11
Author(s):  
Jan Krzysztoforski ◽  
Patrick Jenny ◽  
Marek Henczka
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Supercritical Carbon Dioxide ◽  
Porous Membrane ◽  
Cfd Simulations ◽  
Membrane Cleaning ◽  
Supercritical Carbon

Comparison of CFD Predictions of Supercritical Carbon Dioxide Axial Flow Turbines Using a Number of Turbulence Models

2021 ◽  
Author(s):  
AbdElRahman AbdElDayem ◽  
Martin T. White ◽  
Abdulnaser I. Sayma
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Eddy Viscosity ◽  
Axial Flow ◽  
Turbulence Models ◽  
Loss Assessment ◽  
Cfd Simulations ◽  
Loss Coefficients ◽  
Line Design ◽  
Supercritical Carbon

Abstract A detailed loss assessment of an axial turbine stage operating with a supercritical carbon dioxide (sCO2) based mixture, namely titanium tetrachloride (CO2-TiCl4 85-15%), is presented. To assess aerodynamic losses, computational fluid dynamics (CFD) simulations are conducted using a geometry generated using mean-line design equations which is part of the work delivered to the SCARABEUS project [1]. The CFD simulations are 3D steady state and employ a number of turbulence models to investigate various aerodynamic loss mechanisms. Two categories of turbulence models are used: Eddy Viscosity and Reynold’s Stress models (RSM). The Eddy Viscosity models are the k-ε, k-ε RNG, k-ω, k-ω SST and k-ω Generalized while the RSM models are BSL, LRR, w-RSM and k-ε EARSM. The comparison between different turbulence models showed minor deviations in mass-flow rate, power output and blade loading while significant deviations appear in the loss coefficients and the degree of reaction. It is noted that the k-ε model gives the highest loss coefficients and the lowest isentropic efficiencies while most of the RSM models indicate higher efficiencies and lower loss coefficients. At off-design conditions a sensitivity study revealed that the k-ε RNG model records the sharpest drop in the isentropic efficiency of 8.24% at low mass flowrate reaching 30% off-design. The efficiency sensitivity is found to be less for the other tested models getting 3.1% drop in efficiency for the LRR RSM model.

pH Sensitive polypropylene porous membrane prepared by grafting acrylic acid in supercritical carbon dioxide

Polymer ◽  
2004 ◽  
Vol 45 (3) ◽  
pp. 855-860 ◽  
Author(s):  
Yong Wang ◽  
Zhimin Liu ◽  
Buxing Han ◽  
Zexuan Dong ◽  
Jiaqiu Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Acrylic Acid ◽  
Porous Membrane ◽  
Ph Sensitive ◽  
Supercritical Carbon

Study of Metal Complexes’ Solubility in Supercritical Carbon Dioxide

2011 ◽  
Vol 236-238 ◽  
pp. 411-416 ◽  
Author(s):  
Yi Gang Ding ◽  
Hai Tao Huang ◽  
Yao Ding ◽  
Chang Yan Yang ◽  
Jun Ji ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Supercritical Carbon Dioxide ◽  
Metal Complexes ◽  
Solubility Data ◽  
Experiment Data ◽  
Extraction Device ◽  
Supercritical Temperature ◽  
Good Agreement ◽  
Supercritical Carbon

The solubility of 8-hydroxyquinoline lead, lead diethyldithiocarbamate, 8-hydroxyquinoline mercury and mercury diethyldithiocarbamate in supercritical carbon dioxide under different supercritical conditions was investigated by using supercritical extraction device. It was measured ranged from 308.15K to 328.15K for supercritical temperature, and 10 MPa to 30MPa for pressure. The solubility data of metal complexes were correlated and a mathematical model was put forward from a viewpoint of solvent association theory compared to Chrastil’s model. The results showed that SA model gives fairly good agreement with the experiment data.

scholarly journals Enhancement of Supercritical Fluid Extraction in Membrane Cleaning Process by Addition of Organic Solvents

2013 ◽  
Vol 34 (3) ◽  
pp. 403-414 ◽  
Author(s):  
Jan Krzysztoforski ◽  
Andrzej Krasiński ◽  
Marek Henczka ◽  
Wojciech Piątkiewicz
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Fluid Extraction ◽  
Organic Solvents ◽  
Supercritical Fluid ◽  
Batch Process ◽  
Process Efficiency ◽  
Fluid Extraction ◽  
Membrane Cleaning ◽  
Supercritical Carbon

Abstract In this study, the process of membrane cleaning by supercritical fluid extraction was investigated. Polypropylene microfiltration membranes, contaminated with oils, were treated in a batch process with a supercritical fluid (SCF). As extractant, pure supercritical carbon dioxide or supercritical carbon dioxide with admixtures of methanol, ethanol and isopropanol were used. Single-stage and multi-stage extraction was carried out and process efficiency was determined. The obtained results showed that addition of organic solvents significantly enhances the cleaning performance, which increases with increase of organic solvent concentration and decreases with increasing temperature. All three solvents showed a comparable effect of efficiency enhancement. The results confirmed that supercritical fluid extraction can be applied for polypropylene membrane cleaning.

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