The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
Henry A. Feldman - One of the best experts on this subject based on the ideXlab platform.
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Cyclone Optimization Based on a New Empirical Model for Pressure Drop
Aerosol Science and Technology, 1991Co-Authors: Gurumurthy Ramachandran, David Leith, John A. Dirgo, Henry A. FeldmanAbstract:An empirical model for predicting pressure drop across a Cyclone, developed by Dirgo (1988), is presented. The model was developed through a statistical analysis of pressure drop data for 98 Cyclone designs. The model is shown to perform better than the pressure drop models of Shepherd and Lapple (1940), Alexander (1949), First (1949), Stairmand (1949), and Barth (1956). This model is used with the efficiency model of Iozia and Leith (1990) to develop an optimization curve which predicts the minimum pressure drop and the dimension ratios of the optimized Cyclone for a given aerodynamic cut Diameter, rf50. The effect of variation in Cyclone height, Cyclone Diameter, and flow on the optimization is determined. The optimization results are used to develop a design procedure for optimized Cyclones.
Khairy Elsayed - One of the best experts on this subject based on the ideXlab platform.
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The effect of the Cyclone length on the performance of Stairmand high-efficiency Cyclone
Powder Technology, 2015Co-Authors: Lakhbir Singh Brar, R. P. Sharma, Khairy ElsayedAbstract:The performance parameters of a gas Cyclone, viz., pressure drop and cut-off Diameter, are highly sensitive to its geometry. Cyclone length strongly affects the pressure drop as well as the collection efficiency. The contribution of the present study is therefore twofold. First, the effect of variation in the cylinder as well as the cone lengths on Cyclone performance parameters with respect to the standard Cyclone model is examined. Second, comparison is presented among the two geometrical variables for similar increase in their lengths. The performance and the velocity field are predicted computationally on ten different test models. It has been found that increasing the cylinder length by up to 5.5 times the Cyclone Diameter saves about 34% in the pressure loss and enhances the collection efficiency by about 9.5%. On the other hand, increasing the cone length by up to 6.5 times the Cyclone Diameter shows nearly a 29% reduction in the pressure loss and about an 11% increase in collection efficiency. It is also shown that apart from optimizing the Cyclone length, the designed inlet velocity of the Cyclone must be considered.
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The effect of Cyclone vortex finder dimensions on the flow pattern and performance using LES
Computers & Fluids, 2013Co-Authors: Khairy Elsayed, Chris LacorAbstract:Abstract The effect of the vortex finder dimensions (both the Diameter and length) on the performance and flow field pattern in nine Cyclone separators has been investigated computationally using the large eddy simulation (LES). The vortex finder Diameter varies from 0.3 to 0.5 times the Cyclone Diameter. The vortex finder length varies from 0.5 to unity times the Cyclone Diameter. Decreasing the vortex finder Diameter by 40% results in 175% increase in the dimensionless pressure drop (Euler number) and 50% decrease in the Stokes number. Doubling the vortex finder length increases both the Euler number and the Stokes number by 25%. Decreasing the vortex finder Diameter causes a gradual change in the axial velocity profile from the inverted W to the inverted V profile accompanied with 73% increase in the maximum axial velocity. The maximum tangential velocity approaches asymptotically 1.6 times the inlet velocity (25% increase) when decreasing the vortex finder Diameter by 40%.
Gurumurthy Ramachandran - One of the best experts on this subject based on the ideXlab platform.
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Cyclone Optimization Based on a New Empirical Model for Pressure Drop
Aerosol Science and Technology, 1991Co-Authors: Gurumurthy Ramachandran, David Leith, John A. Dirgo, Henry A. FeldmanAbstract:An empirical model for predicting pressure drop across a Cyclone, developed by Dirgo (1988), is presented. The model was developed through a statistical analysis of pressure drop data for 98 Cyclone designs. The model is shown to perform better than the pressure drop models of Shepherd and Lapple (1940), Alexander (1949), First (1949), Stairmand (1949), and Barth (1956). This model is used with the efficiency model of Iozia and Leith (1990) to develop an optimization curve which predicts the minimum pressure drop and the dimension ratios of the optimized Cyclone for a given aerodynamic cut Diameter, rf50. The effect of variation in Cyclone height, Cyclone Diameter, and flow on the optimization is determined. The optimization results are used to develop a design procedure for optimized Cyclones.
Bryan W. Shaw - One of the best experts on this subject based on the ideXlab platform.
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Effects of Cyclone Diameter on Performance of 1D3D Cyclones: Cutpoint and Slope
Transactions of the ASABE, 2008Co-Authors: William B. Faulkner, Michael D. Buser, Derek P. Whitelock, Bryan W. ShawAbstract:Cyclones are a commonly used air pollution abatement device for separating particulate matter (PM) from air streams in industrial processes. Several mathematical models have been proposed to predict the cutpoint of Cyclones as Cyclone Diameter varies. The objective of this research was to determine the relationship between Cyclone Diameter, cutpoint, and slope of the fractional efficiency curve (FEC) based on empirical data. Tests were performed comparing cutpoints and FEC slopes of 15.24, 30.48, 60.96, and 91.44 cm (6, 12, 24, and 36 in.) Diameter Cyclones with poly-disperse PM having an aerodynamic mass median Diameter near 10 µm. The mass of PM collected by the Cyclones and the mass and particle size distributions of PM that penetrated the Cyclones were used to determine each Cyclone's FEC, characterized by a cutpoint and slope. The cutpoints of Cyclones showed no relationship to Cyclone Diameter, while the slope of the Cyclone FECs increased as Cyclone Diameter increased. Statistically different collection efficiencies were observed among the 30.48, 60.96, and 91.44 cm (12, 24, and 36 in.) Diameter Cyclones. None of the previously published mathematical models analyzed in this article accurately predicted Cyclone cutpoint.
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Effects of Cyclone Diameter on Performance of 1D3D Cyclones: Collection Efficiency
Transactions of the ASABE, 2007Co-Authors: William B. Faulkner, Michael D. Buser, Derek P. Whitelock, Bryan W. ShawAbstract:Cyclones are a common air pollution abatement device for separating particulate matter (PM) from air streams in industrial processes. Several mathematical models have been proposed to predict the performance of Cyclones as Cyclone Diameter varies. The objective of this research was to determine the relationship between Cyclone Diameter and collection efficiency based on empirical data and to compare the results to those of four mathematical models. Tests were performed comparing Cyclone collection efficiency of 15.24, 30.48, 60.96, and 91.44 cm (6, 12, 24, and 36 in.) Diameter Cyclones with poly-disperse PM having an aerodynamic mass median Diameter (MMD) near 10 m. The PM chosen for this study was selected to magnify any differences in Cyclone collection efficiency due to differences in Cyclone barrel Diameter. The mass of PM collected by the Cyclones and the mass of PM that penetrated the Cyclones was used to determine the collection efficiency of each Cyclone. The collection efficiency of Cyclones decreased nonlinearly as Cyclone Diameter increased, with statistically different collection efficiencies observed among the 30.48, 60.96, and 91.44 cm (12, 24, and 36 in.) Diameter Cyclones. None of the mathematical models analyzed in this article accurately predicted Cyclone efficiency.
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Effects of Cyclone Diameter on Performance of 1D3D Cyclones: Collection Efficiency
2006 Portland Oregon July 9-12 2006, 2006Co-Authors: William B. Faulkner, Michael D. Buser, Derek P. Whitelock, Bryan W. ShawAbstract:Cyclones are the most commonly used air pollution abatement device for separating particulate matter (PM) from air streams in agricultural processes, such as cotton gins. Several mathematical models have been proposed to predict the performance of Cyclones as Cyclone Diameter varies. The objective of this research was to determine the relationship between Cyclone Diameter and collection efficiency based on empirical data. Tests were performed comparing Cyclone collection efficiency of 15.24-, 30.48-, 60.96-, and 91.44-cm (6-, 12-, 24-, and 36-in.) Diameter Cyclones with poly-disperse PM having an aerodynamic mass median Diameter near 10 im. The mass of PM collected by the Cyclones and the mass of PM that penetrated the Cyclones was used to determine the collection efficiency of each Cyclone. The collection efficiency of Cyclones decreased nonlinearly as Cyclone Diameter increased with statistically different collection efficiencies observed among the 30.48-, 60.96-, and 91.44-cm (6-, 12-, 24-, and 36-in.) Diameter Cyclones. None of the mathematical models analyzed in this paper accurately predicted Cyclone performance.
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effects of Cyclone Diameter on performance of 1d3d and 2d2d Cyclones
2006Co-Authors: William B. Faulkner, Bryan W. Shaw, Michael D. BuserAbstract:Cyclones are the most commonly used air pollution abatement device for separating particulate matter (PM) from air streams in agricultural processes such as cotton gins. This paper describes a system and the experimental design that will be used to empirically determine the relationship between the Diameter and performance of 1D3D Cyclones. Six, 12, 24, and 36 inch Cyclones will be tested using a polydisperse PM with an aerodynamic mass median Diameter near ten microns. The mass of PM collected by the Cyclones and the mass of PM that penetrates the Cyclones and is deposited on a set of filters will be used to determine the collection efficiency of each Cyclone. The objective of this research is to develop a model to accurately characterize the change in Cyclone performance with changes in Cyclone Diameter based on empirical data.
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A theoretical approach for predicting number of turns and Cyclone pressure drop
Transactions of the ASABE, 2006Co-Authors: Lingjuan Wang, Bryan W. Shaw, Calvin B. Parnell, Ronald E. LaceyAbstract:A new theoretical method for computing travel distance, number of turns, and Cyclone pressure drop has been developed and is presented in this article. The flow pattern and Cyclone dimensions determine the travel distance in a Cyclone. The effective number of turns was calculated based on the travel distance. Cyclone pressure drop is composed of five pressure loss components. The frictional pressure loss is the primary pressure loss in a Cyclone. This new theoretical analysis of Cyclone pressure drop for 1D2D, 2D2D, and 1D3D Cyclones was tested against measured data at different inlet velocities and gave excellent agreement. The results show that Cyclone pressure drop varies with the inlet velocity, but not with Cyclone Diameter.
Hualin Wang - One of the best experts on this subject based on the ideXlab platform.
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Numerical study on tangential velocity indicator of free vortex in the Cyclone
Separation and Purification Technology, 2014Co-Authors: Yanhong Zhang, Hualin WangAbstract:Abstract Tangential velocity indicator n of free vortex zone in Cyclone separator has a significant impact on flow field and pressure drop inside the Cyclone. Scholars have presented different n values on the basis of their experiences and hypothesis to guide the design of the Cyclone separator. Until now, there have been a few researches on the n value, but no universally agreed conclusion has been reached. In this article, the specific n value is deduced by calculating the tangential velocity distribution inside the Cyclone with numerical simulation method, followed by the curve fitting of tangential velocity of the quasi-free vortex zone with least squares algorithm. The influences on n value by Diameter of the Cyclone, Diameter of exit pipe and its immersion depth are investigated. The results show that in the same Cyclone, the change of radial position and the inlet flow rate have no effects on the n value; the changes of the axial position have very little influence on the n value; with the increasing of the Diameter of Cyclone, increasing of the Diameter of exit pipe and the decreasing immersion depth of the exit pipe, the n value increases.
