The Experts below are selected from a list of 91845 Experts worldwide ranked by ideXlab platform
Khairy Elsayed - One of the best experts on this subject based on the ideXlab platform.
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optimization of the cyclone separator geometry for Minimum Pressure drop using co kriging
Powder Technology, 2015Co-Authors: Khairy ElsayedAbstract:The Pressure drop is an essential performance index to evaluate and design gas cyclone. In order to accurately predict the complex non-linear relationships between Pressure drop and geometrical dimensions, a multi-fidelity surrogate, Co-Kriging is developed and employed to model the Pressure drop for cyclone separators using CFD simulations dataset and Muschelknautz model. Only the inlet section dimensions, the vortex finder diameter and the cone height are significant. The Co-Kriging model is more accurate than the ordinary Kriging model. This accuracy can be further enhanced if the optimal Latin hypercube replaced the random sampling plan. In this study, five approaches are proposed and tested for sampling update for the Co-Kriging which was not covered in the literature. These approaches succeeded to enhance the model accuracy by adding few points from both the low-fidelity and high-fidelity simulations. The Co-Kriging model has been used to get a new optimized cyclone for Minimum Pressure drop using the genetic algorithms optimization technique. A CFD comparison between the new design and the standard Stairmand design has been performed. CFD results show that the new cyclone design is very close to the Stairmand high efficiency design in the geometrical parameter ratio (except the cone height), and superior for low Pressure drop. The new cyclone design results in 22% of the Pressure drop obtained by the Stairmand design at the same volume flow rate.
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analysis and optimisation of cyclone separators geometry using rans and les methodologies
2014Co-Authors: Khairy Elsayed, Chris LacorAbstract:The flow field pattern and gas cyclone performance have been investigated using both RANS and LES methodologies. The solid phase has been simulated using the one-way coupling approach. Both the RSM model and LES can be used efficiently to simulate the main features flow field pattern and estimate the performance. However, when looking at the flow details, LES can more accurately capture the unsteady flow phenomena of the highly swirling flow. Two different optimisation techniques have been applied (namely, the Nelder-Mead and the genetic algorithms) to obtain the cyclone geometry for Minimum Pressure drop. Two sources of data for the objective function have been used, mathematical models and experimental data. Starting from a Stairmand design an improved cyclone geometry is found using seven geometrical design variables. A CFD comparison between the original design and the new design has been performed. The simulations confirm the superior performance of the new design.
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modeling and pareto optimization of gas cyclone separator performance using rbf type artificial neural networks and genetic algorithms
Powder Technology, 2012Co-Authors: Khairy Elsayed, Chris LacorAbstract:Abstract Both the Pressure drop and the cut-off diameter are important performance parameters in the design of the cyclone separator. In this paper, a multi-objective optimization study of the gas cyclone separator is performed. In order to predict accurately the complex non linear relationships between the performance parameters (Pressure drop and cut-off diameter) and the geometrical dimensions, two radial basis function neural networks (RBFNNs) are developed and employed to model the Pressure drop and the cut-off diameter for cyclone separators. The artificial neural networks have been trained and tested by the experimental data available in literatures for the Pressure drop and the Iozia and Leith model for the cut-off diameter. The results demonstrate that artificial neural networks can offer an alternative and powerful approach to model the cyclone performance parameters. The analysis indicates the significant effect of the vortex finder diameter D x , the vortex finder length S , the inlet width b and the total height H t . The response surface methodology has been used to fit a second-order polynomial to the RBFNN. The second-order polynomial has been used to study the interaction between the geometrical parameters. The two trained artificial neural networks have been used as two objective functions to get new optimal ratios for Minimum Pressure drop and Minimum cut-off diameter using the multi-objective genetic algorithm optimization technique. Sometimes, the main concern is minimizing the Pressure drop, so a single objective optimization study has been performed to obtain the cyclone geometrical ratio for Minimum Pressure drop. The comparison of numerical simulation of the new optimal design and the Stairmand design confirms the superior performance of the new design.
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optimization of the cyclone separator geometry for Minimum Pressure drop using mathematical models and cfd simulations
Chemical Engineering Science, 2010Co-Authors: Khairy Elsayed, Christian LacorAbstract:The response surface methodology has been performed based on the Muschelknautz method of modeling (MM) to optimize the cyclone geometrical ratios. Four geometrical factors have significant effects on the cyclone performance viz., the vortex finder diameter, the inlet width and inlet height, and the cyclone total height. There are strong interactions between the effect of inlet dimensions and vortex finder diameter on the cyclone performance. CFD simulations based on Reynolds stress model are also used in the investigation. A new set of geometrical ratios (design) has been obtained (optimized) to achieve Minimum Pressure drop. A comparison of numerical simulation of the new design and the Stairmand design confirms the superior performance of the new design compared to the Stairmand design.
Horacio N Solimo - One of the best experts on this subject based on the ideXlab platform.
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density viscosity vapor liquid equilibrium and excess molar enthalpy of chloroform methyl tert butyl ether
Journal of Chemical & Engineering Data, 2010Co-Authors: Rene A Clara, Ana Gomez C Marigliano, Diego Morales, Horacio N SolimoAbstract:Density and viscosity measurements in the T = (273.15 to 318.15) K range of pure chloroform and methyl tert-butyl ether (MTBE), as well as of the binary system [x1 chloroform + (1 − x1) MTBE] over the whole concentration range at T = 293.15 K, were made. The experimental results for the pure components were fitted to empirical equations, which permit the calculation of these properties in the studied temperature range. Calculated values are in agreement with the experimental ones. Data of the binary mixture were further used to calculate the excess molar volume and viscosity deviations. The excess molar enthalpy at T = (303 ± 1) K and vapor−liquid equilibrium measurements at T = (303.15 ± 0.05) K were also measured for the binary system. These last experimental results were used to calculate activity coefficients, the excess molar Gibbs energy, and excess molar entropy. This binary system shows strong negative deviations from ideality and exhibits a Minimum Pressure azeotrope, whose coordinates are: P = (...
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density viscosity vapor liquid equilibrium excess molar volume viscosity deviation and their correlations for the chloroform 2 butanone binary system
Journal of Chemical & Engineering Data, 2006Co-Authors: Rene A Clara, Ana Gomez C Marigliano, Horacio N SolimoAbstract:Density and viscosity measurements for pure trichloromethane and 2-butanone as well as for trichloromethane (1) + 2-butanone (2) were made at (283.15, 293.15, 303.15, and 313.15) K over the whole concentration range. The experimental results were fitted to empirical equations, which permit the calculation of these properties in the whole concentration range and in the studied range of temperatures. The calculated values are in good agreement with the experimental ones. Data of the binary mixture were further used to calculate the excess molar volume and viscosity deviation. Vapor−liquid equilibrium (VLE) at T = 303.15 K for this binary system was also measured in order to calculate the activity coefficients and the excess molar Gibbs function. This binary system shows negative deviations from ideal behavior and forms a Minimum Pressure azeotrope at x1 = 0.199 and p = 15.3 kPa. The excess or deviation properties were fitted by the Redlich−Kister polynomial relation to obtain their coefficients and standard...
Akira Rinoshika - One of the best experts on this subject based on the ideXlab platform.
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Particle fluctuation velocity of a horizontal self-excited pneumatic conveying near the Minimum Pressure drop
Powder Technology, 2013Co-Authors: Fei Yan, Akira RinoshikaAbstract:Abstract In order to reveal the mechanism of the steady transport at the low conveying velocity by using soft fins, the high-speed particle image velocimetry (PIV) is used to measure and analyze particle fluctuation velocity near air conveying velocity of the Minimum Pressure drop (MPD) in a horizontal self-excited pneumatic conveying. The study focuses on the effect of the different fin's lengths on the horizontal pneumatic conveying in terms of the time-averaged particle concentration and velocity, power spectrum, auto-correlation coefficients, two-point correlation coefficients, fluctuation intensity of particle velocity, skewness factor and probability density function. It is found that the power spectra peaks of fins, especially the longer fins, are larger than that of non-fin even at lower air velocity, suggesting the accelerating efficiency of fins' vibration. Meanwhile, the profiles of particle fluctuation velocity intensity indicate that the fins' oscillation generates large particle fluctuating energy even at lower air velocity so that the particles are more easily accelerated and suspended. This is one of the important reasons why the fins' oscillation results in the low Pressure drop and low MPD air velocity. From the distribution of the skewness factor and the probability density function, it is found that the particle fluctuation velocities of all cases follow the Gaussian distribution in the lower and middle parts of pipe, and departure from the Gaussian distribution in the upper part of the pipe. The particle fluctuation velocity of the most efficient Fin320 more obeys the Gaussian-type fluctuation.
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Multi-scale analysis on particle fluctuation velocity near the Minimum Pressure drop in a horizontal pneumatic conveying
Chemical Engineering Science, 2012Co-Authors: Yan Zheng, Akira Rinoshika, Fei YanAbstract:Abstract Multi-scale characteristics of particle fluctuation velocity at the MPD (Minimum Pressure drop) air velocity in the acceleration and fully-developed regimes are experimentally investigated. The high-speed particle image velocimetry (PIV) is first used to measure the fluctuating particle velocities at the MPD air velocity in a horizontal pneumatic conveying. Then the fluctuating particle velocities in the acceleration and fully-developed regimes are analyzed by the continuous wavelet transform and orthogonal wavelet multi-resolution technique. It is found that the wavelet components of low frequency dominate the fluctuating energy of axial particle velocity in the bottom part of the pipe, and contribute about 70% and 84% to the acceleration and fully-developed regimes, respectively. The more contribution to the fluctuating energy of vertical particle velocity, however, comes from the wavelet components of high frequency, accounting for about 82%. The low frequency component of auto-correlation suggests a large-scale particle flow in both acceleration regime and fully-developed regime. The low frequency wavelet component also makes a large contribution to spatial correlation of axial particle velocity, which increases from the acceleration regime to fully-developed regime. The PDF of low frequency components are asymmetrical near the bottom of the pipe, but the PDF of the relatively high frequency exhibits symmetry and the spread of the PDF evidently shrinks for increasing frequencies, implying a reducing fluctuation of high frequency component.
Fei Yan - One of the best experts on this subject based on the ideXlab platform.
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Particle fluctuation velocity of a horizontal self-excited pneumatic conveying near the Minimum Pressure drop
Powder Technology, 2013Co-Authors: Fei Yan, Akira RinoshikaAbstract:Abstract In order to reveal the mechanism of the steady transport at the low conveying velocity by using soft fins, the high-speed particle image velocimetry (PIV) is used to measure and analyze particle fluctuation velocity near air conveying velocity of the Minimum Pressure drop (MPD) in a horizontal self-excited pneumatic conveying. The study focuses on the effect of the different fin's lengths on the horizontal pneumatic conveying in terms of the time-averaged particle concentration and velocity, power spectrum, auto-correlation coefficients, two-point correlation coefficients, fluctuation intensity of particle velocity, skewness factor and probability density function. It is found that the power spectra peaks of fins, especially the longer fins, are larger than that of non-fin even at lower air velocity, suggesting the accelerating efficiency of fins' vibration. Meanwhile, the profiles of particle fluctuation velocity intensity indicate that the fins' oscillation generates large particle fluctuating energy even at lower air velocity so that the particles are more easily accelerated and suspended. This is one of the important reasons why the fins' oscillation results in the low Pressure drop and low MPD air velocity. From the distribution of the skewness factor and the probability density function, it is found that the particle fluctuation velocities of all cases follow the Gaussian distribution in the lower and middle parts of pipe, and departure from the Gaussian distribution in the upper part of the pipe. The particle fluctuation velocity of the most efficient Fin320 more obeys the Gaussian-type fluctuation.
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Multi-scale analysis on particle fluctuation velocity near the Minimum Pressure drop in a horizontal pneumatic conveying
Chemical Engineering Science, 2012Co-Authors: Yan Zheng, Akira Rinoshika, Fei YanAbstract:Abstract Multi-scale characteristics of particle fluctuation velocity at the MPD (Minimum Pressure drop) air velocity in the acceleration and fully-developed regimes are experimentally investigated. The high-speed particle image velocimetry (PIV) is first used to measure the fluctuating particle velocities at the MPD air velocity in a horizontal pneumatic conveying. Then the fluctuating particle velocities in the acceleration and fully-developed regimes are analyzed by the continuous wavelet transform and orthogonal wavelet multi-resolution technique. It is found that the wavelet components of low frequency dominate the fluctuating energy of axial particle velocity in the bottom part of the pipe, and contribute about 70% and 84% to the acceleration and fully-developed regimes, respectively. The more contribution to the fluctuating energy of vertical particle velocity, however, comes from the wavelet components of high frequency, accounting for about 82%. The low frequency component of auto-correlation suggests a large-scale particle flow in both acceleration regime and fully-developed regime. The low frequency wavelet component also makes a large contribution to spatial correlation of axial particle velocity, which increases from the acceleration regime to fully-developed regime. The PDF of low frequency components are asymmetrical near the bottom of the pipe, but the PDF of the relatively high frequency exhibits symmetry and the spread of the PDF evidently shrinks for increasing frequencies, implying a reducing fluctuation of high frequency component.
Rene A Clara - One of the best experts on this subject based on the ideXlab platform.
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density viscosity vapor liquid equilibrium and excess molar enthalpy of chloroform methyl tert butyl ether
Journal of Chemical & Engineering Data, 2010Co-Authors: Rene A Clara, Ana Gomez C Marigliano, Diego Morales, Horacio N SolimoAbstract:Density and viscosity measurements in the T = (273.15 to 318.15) K range of pure chloroform and methyl tert-butyl ether (MTBE), as well as of the binary system [x1 chloroform + (1 − x1) MTBE] over the whole concentration range at T = 293.15 K, were made. The experimental results for the pure components were fitted to empirical equations, which permit the calculation of these properties in the studied temperature range. Calculated values are in agreement with the experimental ones. Data of the binary mixture were further used to calculate the excess molar volume and viscosity deviations. The excess molar enthalpy at T = (303 ± 1) K and vapor−liquid equilibrium measurements at T = (303.15 ± 0.05) K were also measured for the binary system. These last experimental results were used to calculate activity coefficients, the excess molar Gibbs energy, and excess molar entropy. This binary system shows strong negative deviations from ideality and exhibits a Minimum Pressure azeotrope, whose coordinates are: P = (...
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density viscosity vapor liquid equilibrium excess molar volume viscosity deviation and their correlations for the chloroform 2 butanone binary system
Journal of Chemical & Engineering Data, 2006Co-Authors: Rene A Clara, Ana Gomez C Marigliano, Horacio N SolimoAbstract:Density and viscosity measurements for pure trichloromethane and 2-butanone as well as for trichloromethane (1) + 2-butanone (2) were made at (283.15, 293.15, 303.15, and 313.15) K over the whole concentration range. The experimental results were fitted to empirical equations, which permit the calculation of these properties in the whole concentration range and in the studied range of temperatures. The calculated values are in good agreement with the experimental ones. Data of the binary mixture were further used to calculate the excess molar volume and viscosity deviation. Vapor−liquid equilibrium (VLE) at T = 303.15 K for this binary system was also measured in order to calculate the activity coefficients and the excess molar Gibbs function. This binary system shows negative deviations from ideal behavior and forms a Minimum Pressure azeotrope at x1 = 0.199 and p = 15.3 kPa. The excess or deviation properties were fitted by the Redlich−Kister polynomial relation to obtain their coefficients and standard...