The Experts below are selected from a list of 42195 Experts worldwide ranked by ideXlab platform
Shihping Chou - One of the best experts on this subject based on the ideXlab platform.
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designing vortex finder structure for improving the particle Separation Efficiency of a hydrocyclone
Separation and Purification Technology, 2017Co-Authors: Kuo-jen Hwang, Shihping ChouAbstract:Abstract In this study, three types of vortex finder structures, namely Types A, B, and C, of 10-mm hydrocyclones were designed for improving particle Separation Efficiency. The Type A vortex finders had uniform but different thicknesses, and the Types B and C had extra conical shapes with different lengths on the outer surfaces. The velocity and pressure distributions in the hydrocyclones were simulated using computational fluid dynamics. The governing equations were coupled using the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm, and the second-order pressure-strain coupled with the Reynolds stress model was used in the simulations. When the liquid velocity distribution was simulated, particle trajectories were traced on the basis of a Lagrangian frame considering the hydrodynamic interactions between liquid and particles. Calcium carbonate particles with a density of 2800 kg/m3 and a mean size of 17.8 μm were used as a particulate sample. The simulation methods were verified by comparing the simulation results with the experimental data measured using several selected hydrocyclones. The particle Separation efficiencies observed using the different hydrocyclones were compared at an inlet velocity of 10 m/s and a split ratio of 0.6. A thicker vortex finder resulted in higher particle Separation Efficiency because a higher velocity is maintained in the cylindrical part, but it also resulted in reduced particle residence time and an increased pressure drop through the hydrocyclone. Installing conical structures on the outer surface of the vortex finders was beneficial for improving the particle Separation Efficiency and reducing the particle cut-size. The sequence of particle Separation Efficiency observed using the various hydrocyclones was Type C > Type B > Type A. Considering the Separation Efficiency, pressure drop, and particle cut-size simultaneously, Types B-II and C-II were the optimal designs.
C H Ataide - One of the best experts on this subject based on the ideXlab platform.
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residual moisture content and Separation Efficiency optimization in pilot scale vibrating screen
Powder Technology, 2016Co-Authors: F S Guerreiro, Rubens Gedraite, C H AtaideAbstract:Abstract Vibrating screening is still one of the main operations considering solid–solid and solid–liquid Separation processes. Although it is an equipment of simple design and execution, the full description of a screening unit operation may be difficult to predict, considering that several operational variables can influence it. Therefore, the main objective of this work was to evaluate the best possible combination between the process variables screen aperture size, the volumetric concentration of solids in the feed, and the g-force (measurement of the vibration). This configuration predetermined values for moisture content of the retained material over the screen and Separation Efficiency regarding particle size. For this, a suspension of phosphate rock concentrate (with a particle density of 3.25 g/cm 3 and average particle size of 95 μm) was diluted in water to perform the experiments in a pilot-scale vibrating screen. The results were analyzed statistically and correlations for each response were fit. The highest values of Separation Efficiency were found with the lowest values of cut-size diameter, which is desirable in terms of Separation. A multi-objective optimization in the experimental range was developed, finding the optimal point for the moisture content of 17.29% and the Separation Efficiency of 86.88%. The effects of screen aperture size and g-force had important roles in this study.
Qiang Li - One of the best experts on this subject based on the ideXlab platform.
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Numerical and experimental study on Separation Efficiency of steam separators
2010 IEEE International Conference on Mechatronics and Automation, 2010Co-Authors: Li-chun Xiao, Zhi-jiang Ding, Qiang LiAbstract:To improve the Separation Efficiency of steam and gas in power plant a new type steam separator is presented. A mathematical model is established for simulating the flow field of gas flow channels in steam separator. The gas-water separating Efficiency is calculated for the droplets at different particle diameter. The equations are solved by using computational fluid dynamics (CFD) method. Fibreglass filtering method is used for measuring the Separation Efficiency of steam separator. The results show that structure parameters and inlet gas velocity have great influence on the Separation Efficiency of wave type plate separator. The Separation Efficiency of steam separator with hooks is higher than that without it. Plate spacing and length offer the largest opportunity to the performance improvement. The droplets removal Efficiency increases with the plate spacing reduction. The turning angle must be less than 54° for a high Efficiency and low pressure loss. The gas velocity within the separator should be kept below a critical velocity as well in order to avoid re-entrainment. Separation Efficiency of steam separator is high when moisture content of inlet gas is less than 30 g/m3. Numerical and experimental method can predict Separation Efficiency of steam separator for the removal of droplets from gas. It can be directly used for the design of steam separator.
Kuo-jen Hwang - One of the best experts on this subject based on the ideXlab platform.
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designing vortex finder structure for improving the particle Separation Efficiency of a hydrocyclone
Separation and Purification Technology, 2017Co-Authors: Kuo-jen Hwang, Shihping ChouAbstract:Abstract In this study, three types of vortex finder structures, namely Types A, B, and C, of 10-mm hydrocyclones were designed for improving particle Separation Efficiency. The Type A vortex finders had uniform but different thicknesses, and the Types B and C had extra conical shapes with different lengths on the outer surfaces. The velocity and pressure distributions in the hydrocyclones were simulated using computational fluid dynamics. The governing equations were coupled using the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm, and the second-order pressure-strain coupled with the Reynolds stress model was used in the simulations. When the liquid velocity distribution was simulated, particle trajectories were traced on the basis of a Lagrangian frame considering the hydrodynamic interactions between liquid and particles. Calcium carbonate particles with a density of 2800 kg/m3 and a mean size of 17.8 μm were used as a particulate sample. The simulation methods were verified by comparing the simulation results with the experimental data measured using several selected hydrocyclones. The particle Separation efficiencies observed using the different hydrocyclones were compared at an inlet velocity of 10 m/s and a split ratio of 0.6. A thicker vortex finder resulted in higher particle Separation Efficiency because a higher velocity is maintained in the cylindrical part, but it also resulted in reduced particle residence time and an increased pressure drop through the hydrocyclone. Installing conical structures on the outer surface of the vortex finders was beneficial for improving the particle Separation Efficiency and reducing the particle cut-size. The sequence of particle Separation Efficiency observed using the various hydrocyclones was Type C > Type B > Type A. Considering the Separation Efficiency, pressure drop, and particle cut-size simultaneously, Types B-II and C-II were the optimal designs.
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Particle Separation Efficiency in two 10-mm hydrocyclones in series
Journal of The Taiwan Institute of Chemical Engineers, 2009Co-Authors: Kuo-jen Hwang, Youichi NagaseAbstract:Abstract Two identical 10-mm hydrocyclone connected in series for improving particle Separation Efficiency is studied using two particulate samples. The operating variable effects, such as feed rate, split ratio and pressure drop through hydrocyclones on the Separation Efficiency, energy loss and outlet particle concentration are thoroughly discussed. Some empirical operating equations correlated to dimensionless groups, e.g. , Reynolds number, Euler number, Stokes number and spilt ratio, are proposed that can be employed for evaluating the partial Separation Efficiency and the hydrocyclone installation effectiveness. The partial Separation Efficiency of various particulate samples under different operating conditions can be expressed as a unique power-type general Stokes number and split ratio equations. When two hydrocyclones are installed in series, the d 50 value decreases significantly, however, no evident difference can be found for the d 100 cut-size. To connect a second hydrocyclone in series and to operate at a high split ratio in the first hydrocyclone are the optimal conditions from the particle Separation Efficiency, energy saving and outlet clarity viewpoint. However, the particle classification sharpness cannot be improved by connecting two hydrocyclones in series due to the fish-hook effect.
F S Guerreiro - One of the best experts on this subject based on the ideXlab platform.
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residual moisture content and Separation Efficiency optimization in pilot scale vibrating screen
Powder Technology, 2016Co-Authors: F S Guerreiro, Rubens Gedraite, C H AtaideAbstract:Abstract Vibrating screening is still one of the main operations considering solid–solid and solid–liquid Separation processes. Although it is an equipment of simple design and execution, the full description of a screening unit operation may be difficult to predict, considering that several operational variables can influence it. Therefore, the main objective of this work was to evaluate the best possible combination between the process variables screen aperture size, the volumetric concentration of solids in the feed, and the g-force (measurement of the vibration). This configuration predetermined values for moisture content of the retained material over the screen and Separation Efficiency regarding particle size. For this, a suspension of phosphate rock concentrate (with a particle density of 3.25 g/cm 3 and average particle size of 95 μm) was diluted in water to perform the experiments in a pilot-scale vibrating screen. The results were analyzed statistically and correlations for each response were fit. The highest values of Separation Efficiency were found with the lowest values of cut-size diameter, which is desirable in terms of Separation. A multi-objective optimization in the experimental range was developed, finding the optimal point for the moisture content of 17.29% and the Separation Efficiency of 86.88%. The effects of screen aperture size and g-force had important roles in this study.
