The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform

Jianjun Wang - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation of a new Cyclone separator part ii simulation results
    Separation and Purification Technology, 2016
    Co-Authors: Weiwei Xu, Qiang Li, Jianjun Wang
    Abstract:

    Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone separator performance. The gas flow in axial-Inlet Cyclone separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of separator, and finally exits the separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the Inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.

  • Performance evaluation of a new Cyclone separator – Part II simulation results☆
    Separation and Purification Technology, 2016
    Co-Authors: Jianjun Wang, Youhai Jin
    Abstract:

    Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone separator performance. The gas flow in axial-Inlet Cyclone separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of separator, and finally exits the separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the Inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.

  • performance evaluation of a new Cyclone separator part i experimental results
    Separation and Purification Technology, 2015
    Co-Authors: Qiang Li, Weiwei Xu, Jianjun Wang
    Abstract:

    Abstract This paper presents the gas flow characteristics of a guide-vane-Inlet Cyclone separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.

  • Performance evaluation of a new Cyclone separator – Part I experimental results
    Separation and Purification Technology, 2015
    Co-Authors: Jianjun Wang, Youhai Jin
    Abstract:

    Abstract This paper presents the gas flow characteristics of a guide-vane-Inlet Cyclone separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.

Youhai Jin - One of the best experts on this subject based on the ideXlab platform.

  • Performance evaluation of a new Cyclone separator – Part II simulation results☆
    Separation and Purification Technology, 2016
    Co-Authors: Jianjun Wang, Youhai Jin
    Abstract:

    Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone separator performance. The gas flow in axial-Inlet Cyclone separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of separator, and finally exits the separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the Inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.

  • Performance evaluation of a new Cyclone separator – Part I experimental results
    Separation and Purification Technology, 2015
    Co-Authors: Jianjun Wang, Youhai Jin
    Abstract:

    Abstract This paper presents the gas flow characteristics of a guide-vane-Inlet Cyclone separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.

Irfan Karagoz - One of the best experts on this subject based on the ideXlab platform.

  • effects of separation space diameter on the performance of a novel reverse flow Cyclone
    Separation Science and Technology, 2019
    Co-Authors: Ali Sakin, Irfan Karagoz, Atakan Avci
    Abstract:

    ABSTRACTA numerical study was carried out to investigate the effect of separation space diameter on the performance of a novel reverse flow tangential Inlet Cyclone design by using the Eulerian-Lag...

  • experimental and numerical investigation of pressure drop coefficient and static pressure difference in a tangential Inlet Cyclone separator
    Chemical Papers, 2012
    Co-Authors: Fuat Kaya, Irfan Karagoz
    Abstract:

    The aim of this study was to investigate the pressure drop coefficient and the static pressure difference related to the natural vortex length and to evaluate the results for gas-particle applications. CFD simulations were carried out using a numerical technique which had been verified previously. Results obtained from the numerical simulations were compared with the experimental data. Analysis of the results showed that the pressure drop coefficient decreases with the increasing Inlet velocity, becoming almost constant above a certain value of the Inlet velocity. The reason is that the effect of viscous forces decreases at high Reynolds numbers. The pressure drop coefficient also decreases with the increasing exit pipe diameter and decreasing exit pipe length.

  • effects of surface roughness on the performance of tangential Inlet Cyclone separators
    Aerosol Science and Technology, 2011
    Co-Authors: Fuat Kaya, Irfan Karagoz, Atakan Avci
    Abstract:

    This study is carried out to investigate the effects of surface roughness on the flow field and Cyclone performance. The flow inside the Cyclone separator is modeled as a three-dimensional turbulent continuous gas flow with solid particles as a discrete phase. The continuous gas flow is predicted by solving the governing equations by using the Reynolds Stress turbulence model, and the modeling of the particle motions is based on a Lagrangian approach. The results of the numerical simulations are compared with experimental data as well as with the results of mathematical models. Analysis of computed results shows that increase of relative roughness due to corrosion, wear, or accumulation of particles on the inner walls considerably influences the tangential velocity, Cyclone separation efficiency, and Cyclone pressure drop especially for high Inlet velocities. Decreases in Cyclone collection efficiency and pressure drop with the increase in surface roughness are found to be more pronounced for high values ...

  • usability of Cyclone separators as air filters in vehicles
    International Journal of Vehicle Design, 2010
    Co-Authors: Irfan Karagoz, Fuat Kaya, Atakan Avci
    Abstract:

    This study deals with the use of Cyclone separators as air filters in light or heavy duty vehicles. Cyclone separators were compared with the conventional air filters, which provide low particle collection efficiency with high pressure drop, and these characteristics are made worse by contamination. By taking into account the related studies in the literature, tangential Inlet Cyclones were considered in this comparison. The pressure drop and particle collection efficiency in the proposed tangential Inlet Cyclone were computed by using the mathematical models given in the literature. Comparison of the computed results of the Cyclone with the conventional air filters demonstrated that the tangential Inlet Cyclones are advantageous because of low pressure drop and high particle collection efficiency and can be used as main or pre-filters in vehicles.

  • Effects of Inlet Geometry on the Pressure Drop and Collection Efficiency of Tangential Inlet Cyclones
    ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis Volume 3, 2010
    Co-Authors: Mehmet Teke, Irfan Karagoz
    Abstract:

    This work presents a computational fluid dynamics simulation to investigate the effects of Inlet geometry on the pressure drop and particle collection efficiency of a tangential Inlet Cyclone. Three-dimensional, steady governing equations for the incompressible, turbulent flow inside a tangential Inlet Cyclone are solved numerically under certain boundary conditions. The continuous gas flow is predicted by solving Navier-Stokes equations using the differential RSM turbulence model. The second phase is modeled based on a Lagrangian approach. The commercial CFD code Fluent was used for numerical analysis. Computational results compared experimental data available in the literature for validation. Various Cyclones, each has different geometrical ratio of Inlet section, studied in this paper. Detail analyses of the effects of Inlet geometry on the flow behavior, pressure drop and collection efficiency were given.Copyright © 2010 by ASME

Weiwei Xu - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation of a new Cyclone separator part ii simulation results
    Separation and Purification Technology, 2016
    Co-Authors: Weiwei Xu, Qiang Li, Jianjun Wang
    Abstract:

    Abstract A novel vortex finder (slotted vortex finder) was designed to improve Cyclone separator performance. The gas flow in axial-Inlet Cyclone separator with the novel vortex finder is simulated by means of Reynolds Stress Model (RSM). The computational results of the flow patterns in Cyclone separator are compared with the experimental ones, and the results show that RSM offers a robust, reliable modeling option for such flows. Three dimensional gas flow simulation results indicate that the gas flow exits the separator through two pathways. One part of the gas spirals down from outer annular space to outer separation space and dust hopper, then spirals upward in the inner part of separator, and finally exits the separator. The other gas flow enters the vent pipe through the slots in vortex finder rather than entering the separation space. The simulation results show that the latter part flow accounts for 54% of the total gas flow. Diversion of gas pathways has three advantages. Firstly, the 54% of the gas–solid flows can be separated by slots due to the novel vortex finder. Secondly, the results also indicate that there are almost no short circuit flows under the Inlet of the slotted vortex finder. Thirdly, the slotted vortex finder reduces the flow swirling intensity and undesired instabilities, and thus the slotted vortex finder can reduce pressure drop.

  • performance evaluation of a new Cyclone separator part i experimental results
    Separation and Purification Technology, 2015
    Co-Authors: Qiang Li, Weiwei Xu, Jianjun Wang
    Abstract:

    Abstract This paper presents the gas flow characteristics of a guide-vane-Inlet Cyclone separator with a novel vortex finder. The new design is based on the idea of increasing Cyclone efficiency and reducing pressure drop by improving vortex finder structure. Instead of traditional vent pipe, the vortex finder is slotted on side wall. A model of Cyclone with this novel vortex finder has been manufactured and tested. Total collection efficiency, grade collection efficiency and pressure drop were measured at various flow rates. Experimental results show that the novel vortex finder can increase particle collection efficiency and reduce pressure drop.

Atakan Avci - One of the best experts on this subject based on the ideXlab platform.

  • effects of separation space diameter on the performance of a novel reverse flow Cyclone
    Separation Science and Technology, 2019
    Co-Authors: Ali Sakin, Irfan Karagoz, Atakan Avci
    Abstract:

    ABSTRACTA numerical study was carried out to investigate the effect of separation space diameter on the performance of a novel reverse flow tangential Inlet Cyclone design by using the Eulerian-Lag...

  • effects of surface roughness on the performance of tangential Inlet Cyclone separators
    Aerosol Science and Technology, 2011
    Co-Authors: Fuat Kaya, Irfan Karagoz, Atakan Avci
    Abstract:

    This study is carried out to investigate the effects of surface roughness on the flow field and Cyclone performance. The flow inside the Cyclone separator is modeled as a three-dimensional turbulent continuous gas flow with solid particles as a discrete phase. The continuous gas flow is predicted by solving the governing equations by using the Reynolds Stress turbulence model, and the modeling of the particle motions is based on a Lagrangian approach. The results of the numerical simulations are compared with experimental data as well as with the results of mathematical models. Analysis of computed results shows that increase of relative roughness due to corrosion, wear, or accumulation of particles on the inner walls considerably influences the tangential velocity, Cyclone separation efficiency, and Cyclone pressure drop especially for high Inlet velocities. Decreases in Cyclone collection efficiency and pressure drop with the increase in surface roughness are found to be more pronounced for high values ...

  • usability of Cyclone separators as air filters in vehicles
    International Journal of Vehicle Design, 2010
    Co-Authors: Irfan Karagoz, Fuat Kaya, Atakan Avci
    Abstract:

    This study deals with the use of Cyclone separators as air filters in light or heavy duty vehicles. Cyclone separators were compared with the conventional air filters, which provide low particle collection efficiency with high pressure drop, and these characteristics are made worse by contamination. By taking into account the related studies in the literature, tangential Inlet Cyclones were considered in this comparison. The pressure drop and particle collection efficiency in the proposed tangential Inlet Cyclone were computed by using the mathematical models given in the literature. Comparison of the computed results of the Cyclone with the conventional air filters demonstrated that the tangential Inlet Cyclones are advantageous because of low pressure drop and high particle collection efficiency and can be used as main or pre-filters in vehicles.

  • modelling of the pressure drop in tangential Inlet Cyclone separators
    Aerosol Science and Technology, 2005
    Co-Authors: Irfan Karagoz, Atakan Avci
    Abstract:

    This article introduces a new mathematical model that predicts the pressure drop in a tangential Inlet Cyclone. The model calculates the pressure drop from the frictional losses in the Cyclone body, using a wall friction coefficient based on the surface roughness and Reynolds number. The entrance and exit losses are also included in the model by defining new geometrical parameters. The pressure drop coefficient is obtained as a function of Cyclone dimensions and operating conditions. The model is validated by studying 12 different Cyclones presented in the literature. Comparison of the model results with predictions and measurements published in the literature show that the new model predicts the experimental results quite well for a wide range of operating conditions covering a flow rate of 0.3–220 l/s and a temperature range of 293–1200°K, in different Cyclones. The pressure drop coefficient is also examined in view of the outlet pipe diameter, friction coefficient, surface roughness, and Reynolds number.

  • effects of flow and geometrical parameters on the collection efficiency in Cyclone separators
    Journal of Aerosol Science, 2003
    Co-Authors: Atakan Avci, Irfan Karagoz
    Abstract:

    A mathematical model has been developed for calculation of cut-off size and fractional efficiencies in Cyclone separators, by taking into account the effects of flow, particle and geometrical parameters, and acceleration assuming that the mixture of fluid and particles is homogenous, and acceleration diminishes depending on the friction and geometry. Collection efficiency curves and cut-off size values predicted by the proposed model showed a good agreement with experiments over a wide range of Inlet velocities for different types of Cyclones. Comparison of the obtained results with semi empirical models available in literature also indicated that the present model may be used successfully for determination of the performance of a tangential Inlet Cyclone. Analyses of the effects of various parameters reveals that, in addition to flow and geometrical parameters, surface friction, vortex length and flow regimes play an important role on Cyclone performance especially in small Cyclones.