The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Andre Benard - One of the best experts on this subject based on the ideXlab platform.
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design of Liquid Liquid Separation hydrocyclones using parabolic and hyperbolic swirl chambers for efficiency enhancement
Chemical Engineering Research & Design, 2017Co-Authors: Abdul Motin, Andre BenardAbstract:Abstract The wall profile of the swirl chamber greatly impacts the internal flow structures and Separation efficiency of a Liquid–Liquid Separation hydrocyclone. The objective of this study is to examine the effects of parabolic and hyperbolic wall profiles of hydrocyclone swirl chamber on the internal flow structures and Separation efficiency based on the numerical simulations. The internal flow structures observed for the different wall profiles of swirl chamber motivates the redesign of hydrocyclone geometry to achieve enhanced Separation efficiency. Results show that, for a dilute system (oil concentration less than 1%), the hyperbolic and parabolic swirl chambers without a tail pipe yield, respectively, 16.5% and 25% higher Separation efficiency for a droplet size of 30 μm when compared with a conical swirl chamber without tail pipe. However, the hyperbolic swirl chamber has a greater potential for the reduction of effective length of hydrocyclone with maintaining high Separation efficiency. In addition, a hydrocyclone with truncated hyperbolic swirl chamber and tail pipe provides very long reverse flow core and yields 17% and 33% higher efficiency than that of full hyperbolic and conical swirl chambers without tail pipe, respectively.
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Design of Liquid–Liquid Separation hydrocyclones using parabolic and hyperbolic swirl chambers for efficiency enhancement
Chemical Engineering Research & Design, 2017Co-Authors: Abdul Motin, Andre BenardAbstract:Abstract The wall profile of the swirl chamber greatly impacts the internal flow structures and Separation efficiency of a Liquid–Liquid Separation hydrocyclone. The objective of this study is to examine the effects of parabolic and hyperbolic wall profiles of hydrocyclone swirl chamber on the internal flow structures and Separation efficiency based on the numerical simulations. The internal flow structures observed for the different wall profiles of swirl chamber motivates the redesign of hydrocyclone geometry to achieve enhanced Separation efficiency. Results show that, for a dilute system (oil concentration less than 1%), the hyperbolic and parabolic swirl chambers without a tail pipe yield, respectively, 16.5% and 25% higher Separation efficiency for a droplet size of 30 μm when compared with a conical swirl chamber without tail pipe. However, the hyperbolic swirl chamber has a greater potential for the reduction of effective length of hydrocyclone with maintaining high Separation efficiency. In addition, a hydrocyclone with truncated hyperbolic swirl chamber and tail pipe provides very long reverse flow core and yields 17% and 33% higher efficiency than that of full hyperbolic and conical swirl chambers without tail pipe, respectively.
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Numerical investigation of the performance and hydrodynamics of a rotating tubular membrane used for Liquid-Liquid Separation
Journal of Membrane Science, 2014Co-Authors: Abdul Motin, Volodymyr V. Tarabara, Andre BenardAbstract:The performance of a Liquid–Liquid Separation process based on an axially rotating tubular ceramic membrane operated in a crossflow regime is studied numerically with oil–water dispersions used as a model mixture. Internal hydrodynamics are explored using computational fluid dynamics simulations to obtain the velocity field in the continuous phase (water) and predict the Separation efficiency with respect to the dispersed phase (oil). A discrete phase model is used to estimate trajectories of dispersed oil droplets within the membrane channel. The Separation performance of the process is evaluated in terms of the droplet cutoff size. Effects of the Reynolds and Swirl numbers on velocity and pressure fields, shear stress, droplet cutoff size, and Separation efficiency are investigated. The increased shear stress on the membrane surface due to the angular and the crossflow velocities decreased the accumulation of droplets on the membrane while increasing the Separation efficiency. The droplet cutoff size is observed to decrease with an increase in the Reynolds and Swirl numbers. The Separation efficiency strongly depends on the Swirl and Stokes numbers but only weekly on the Reynolds number. By increasing the Swirl number of the flow, it may be possible to remove very fine droplets by centrifugal force only and avoid membrane fouling.
Toyohisa Fujita - One of the best experts on this subject based on the ideXlab platform.
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enrichment of silicocarnotite from silicocarnotite and gehlenite mixtures using a kerosene based Liquid Liquid Separation process
Journal of environmental chemical engineering, 2019Co-Authors: Mauricio Cordova Udaeta, Josiane Ponou, Gjergj Dodbiba, Toyohisa FujitaAbstract:Abstract Thermal processing methods aimed at the recycling of phosphate from leftover materials oftentimes result in the formation of silicon-substituted apatites alongside aluminum-silicate phases. In order to improve the recovery of the apatites obtained in such a way, an enrichment technique is required. The present research work studies the Separation of a silicon-substituted apatite (silicocarnotite, Ca5(PO4)2SiO4), from an aluminum-silicate phase (gehlenite, Ca2Al2SiO7), via a straightforward Liquid-Liquid Separation process using an anionic surfactant (sodium dodecyl sulfate –SDS–), a polyelectrolyte (chitosan) and kerosene. Analysis of the thermal behavior of silicocarnotite and gehlenite, suggested these substances can be formed simultaneously at temperatures higher than 1200 C°. Secondly, zeta potential measurements for these species showed silicocarnotite has the point of zero charge (PZC) at around pH = 5.5, whereas gehlenite remains negatively charged in the entire range of pH tested (2.5–11). Results for the Liquid-Liquid Separation process indicated that SDS alone promotes the agglomeration of silicocarnotite in the organic fraction at pH values lower than 5.5. This can be explained due to be the preferred interaction between the net positive charge on the surface of silicocarnotite particles and the negative charge present in SDS. In sharp contrast, it was found that SDS alone does not exert any influence on gehlenite agglomeration as predicted by the zeta potential analysis. When the Separation process was tested onto a 1:1 mix of silicocarnotite and gehlenite, a chitosan dose of 100 g/tonne alongside a dose of 1.44 kg SDS/tonne, promoted the largest capture of material in the organic fraction (around 60% of the initial material), and caused the amount of P2O5 content in the organic fraction to be roughly twice the amount that of the aqueous fraction. Consequently, these results put forward the Liquid-Liquid process developed as a possible Separation path for the target species.
Yongbin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Recent Patent on a Tree-type Cylindrical-shaped Nanoporous Filtering Membrane
Recent Patents on Engineering, 2019Co-Authors: Yongbin ZhangAbstract:Background: Nanoporous filtering membranes can be used for super purification including a Liquid-Liquid Separation. It is the aim of engineers to design these membranes with good filtration capabilities, high fluxes and satisfying mechanical strengths. Realistic membranes need to have a balance among these performances to achieve satisfactory overall performances. Objective: The study aims to show a tree-type cylindrical-shaped nanoporous filtering membrane with good characteristics. Methods: According to the principle of the nanotube tree for transportation presented previously, here the design method of a tree-type cylindrical shaped nanoporous filtering membrane is presented and the flow resistances of this membrane have been calculated for varying operational parameter values. Results: It is shown that the invented membrane possesses nanoscale filtration pores and larger flow-resistance-reducing pores. These pores are densely evenly distributed on the membrane surface. The membrane practically has a low flow resistance and thus a high flux if its thickness is as small as possible. It can also be used for a Liquid-Liquid Separation if the mixed Liquids have largely different interactions with the pore walls of the membrane. Conclusion: By an appropriate design, the invented membrane has a good overall performance including the capabilities of super purification or a Liquid-Liquid Separation, the high flux and a satisfactory mechanical strength.
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Optimized Tree-Type Cylindrical-Shaped Nanoporous Filtering Membranes with 3 or 5 Branch Pores in Each Pore Tree
Current Nanoscience, 2019Co-Authors: Yongbin ZhangAbstract:Background: It is necessary to investigate the performances of the optimized tree-type cylindrical-shaped nanoporous filtering membranes with 3 or 5 branch pores in each pore tree. Objective: To explore the design method for and the performances of the Liquid-particle and LiquidLiquid Separations of the optimized tree-type cylindrical-shaped nanoporous filtering membranes with 3 or 5 branch pores in each pore tree. Methods: The analysis was made for the flow resistance of the studied membrane based on the nanoscale flow equation. The optimum ratios of the radius of the trunk pore to the radius of the branch pore were typically calculated for yielding the lowest flow resistance of this membrane. The capability of the Liquid-Liquid Separation of this membrane was investigated by exploring the flow resistances of this membrane for different Liquids. Results: The optimum ratios of the radius of the trunk pore to the radius of the branch pore were typically calculated for the maximum fluxes of these membranes for different passing Liquid-pore wall interactions. They can be used for the design of the studied membranes for Liquid-particle or Liquid-Liquid Separations. The flow resistances of the studied membranes in the optimum condition for different Liquids were also calculated, and the capability of the Liquid-Liquid Separation of the membranes is evidenced. Conclusion: The obtained results can be used for the design of the studied membranes for achieving their optimum operating condition, by taking the ratio of the radius of the trunk pore to the radius of the branch pore as optimum. The studied membranes also have good capabilities of Liquid-Liquid Separations if the mixed Liquids have greatly different interactions with the pore wall and the radius of the branch pore is below 3nm or less.
Abdul Motin - One of the best experts on this subject based on the ideXlab platform.
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design of Liquid Liquid Separation hydrocyclones using parabolic and hyperbolic swirl chambers for efficiency enhancement
Chemical Engineering Research & Design, 2017Co-Authors: Abdul Motin, Andre BenardAbstract:Abstract The wall profile of the swirl chamber greatly impacts the internal flow structures and Separation efficiency of a Liquid–Liquid Separation hydrocyclone. The objective of this study is to examine the effects of parabolic and hyperbolic wall profiles of hydrocyclone swirl chamber on the internal flow structures and Separation efficiency based on the numerical simulations. The internal flow structures observed for the different wall profiles of swirl chamber motivates the redesign of hydrocyclone geometry to achieve enhanced Separation efficiency. Results show that, for a dilute system (oil concentration less than 1%), the hyperbolic and parabolic swirl chambers without a tail pipe yield, respectively, 16.5% and 25% higher Separation efficiency for a droplet size of 30 μm when compared with a conical swirl chamber without tail pipe. However, the hyperbolic swirl chamber has a greater potential for the reduction of effective length of hydrocyclone with maintaining high Separation efficiency. In addition, a hydrocyclone with truncated hyperbolic swirl chamber and tail pipe provides very long reverse flow core and yields 17% and 33% higher efficiency than that of full hyperbolic and conical swirl chambers without tail pipe, respectively.
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Design of Liquid–Liquid Separation hydrocyclones using parabolic and hyperbolic swirl chambers for efficiency enhancement
Chemical Engineering Research & Design, 2017Co-Authors: Abdul Motin, Andre BenardAbstract:Abstract The wall profile of the swirl chamber greatly impacts the internal flow structures and Separation efficiency of a Liquid–Liquid Separation hydrocyclone. The objective of this study is to examine the effects of parabolic and hyperbolic wall profiles of hydrocyclone swirl chamber on the internal flow structures and Separation efficiency based on the numerical simulations. The internal flow structures observed for the different wall profiles of swirl chamber motivates the redesign of hydrocyclone geometry to achieve enhanced Separation efficiency. Results show that, for a dilute system (oil concentration less than 1%), the hyperbolic and parabolic swirl chambers without a tail pipe yield, respectively, 16.5% and 25% higher Separation efficiency for a droplet size of 30 μm when compared with a conical swirl chamber without tail pipe. However, the hyperbolic swirl chamber has a greater potential for the reduction of effective length of hydrocyclone with maintaining high Separation efficiency. In addition, a hydrocyclone with truncated hyperbolic swirl chamber and tail pipe provides very long reverse flow core and yields 17% and 33% higher efficiency than that of full hyperbolic and conical swirl chambers without tail pipe, respectively.
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Numerical investigation of the performance and hydrodynamics of a rotating tubular membrane used for Liquid-Liquid Separation
Journal of Membrane Science, 2014Co-Authors: Abdul Motin, Volodymyr V. Tarabara, Andre BenardAbstract:The performance of a Liquid–Liquid Separation process based on an axially rotating tubular ceramic membrane operated in a crossflow regime is studied numerically with oil–water dispersions used as a model mixture. Internal hydrodynamics are explored using computational fluid dynamics simulations to obtain the velocity field in the continuous phase (water) and predict the Separation efficiency with respect to the dispersed phase (oil). A discrete phase model is used to estimate trajectories of dispersed oil droplets within the membrane channel. The Separation performance of the process is evaluated in terms of the droplet cutoff size. Effects of the Reynolds and Swirl numbers on velocity and pressure fields, shear stress, droplet cutoff size, and Separation efficiency are investigated. The increased shear stress on the membrane surface due to the angular and the crossflow velocities decreased the accumulation of droplets on the membrane while increasing the Separation efficiency. The droplet cutoff size is observed to decrease with an increase in the Reynolds and Swirl numbers. The Separation efficiency strongly depends on the Swirl and Stokes numbers but only weekly on the Reynolds number. By increasing the Swirl number of the flow, it may be possible to remove very fine droplets by centrifugal force only and avoid membrane fouling.
Mauricio Cordova Udaeta - One of the best experts on this subject based on the ideXlab platform.
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enrichment of silicocarnotite from silicocarnotite and gehlenite mixtures using a kerosene based Liquid Liquid Separation process
Journal of environmental chemical engineering, 2019Co-Authors: Mauricio Cordova Udaeta, Josiane Ponou, Gjergj Dodbiba, Toyohisa FujitaAbstract:Abstract Thermal processing methods aimed at the recycling of phosphate from leftover materials oftentimes result in the formation of silicon-substituted apatites alongside aluminum-silicate phases. In order to improve the recovery of the apatites obtained in such a way, an enrichment technique is required. The present research work studies the Separation of a silicon-substituted apatite (silicocarnotite, Ca5(PO4)2SiO4), from an aluminum-silicate phase (gehlenite, Ca2Al2SiO7), via a straightforward Liquid-Liquid Separation process using an anionic surfactant (sodium dodecyl sulfate –SDS–), a polyelectrolyte (chitosan) and kerosene. Analysis of the thermal behavior of silicocarnotite and gehlenite, suggested these substances can be formed simultaneously at temperatures higher than 1200 C°. Secondly, zeta potential measurements for these species showed silicocarnotite has the point of zero charge (PZC) at around pH = 5.5, whereas gehlenite remains negatively charged in the entire range of pH tested (2.5–11). Results for the Liquid-Liquid Separation process indicated that SDS alone promotes the agglomeration of silicocarnotite in the organic fraction at pH values lower than 5.5. This can be explained due to be the preferred interaction between the net positive charge on the surface of silicocarnotite particles and the negative charge present in SDS. In sharp contrast, it was found that SDS alone does not exert any influence on gehlenite agglomeration as predicted by the zeta potential analysis. When the Separation process was tested onto a 1:1 mix of silicocarnotite and gehlenite, a chitosan dose of 100 g/tonne alongside a dose of 1.44 kg SDS/tonne, promoted the largest capture of material in the organic fraction (around 60% of the initial material), and caused the amount of P2O5 content in the organic fraction to be roughly twice the amount that of the aqueous fraction. Consequently, these results put forward the Liquid-Liquid process developed as a possible Separation path for the target species.