The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Shahrokh Shahhosseini - One of the best experts on this subject based on the ideXlab platform.

  • Optimal design of drainage Channel Geometry parameters in vane demister liquid–gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.

  • optimal design of drainage Channel Geometry parameters in vane demister liquid gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.

Fatemeh Kavousi - One of the best experts on this subject based on the ideXlab platform.

  • Optimal design of drainage Channel Geometry parameters in vane demister liquid–gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.

  • optimal design of drainage Channel Geometry parameters in vane demister liquid gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.

Sherine El Baradei - One of the best experts on this subject based on the ideXlab platform.

  • Studying the Effect of Channel Geometry on Different Water Quality Variables for Effective Designs and Waste Allocation Plans for Waterways
    Water, 2020
    Co-Authors: Sherine El Baradei
    Abstract:

    It is necessary to study the parameters that affect water quality in order to devise mitigation measures if water quality would be at risk or negatively affected by those parameters. Those parameters are physical, chemical, biological, and hydraulic characteristics. This research will study the effect of Channel Geometry on different water quality variables, which is important in designing new irrigation canals in order to see how its Geometry will affect water quality and lessen any negative impact if possible; also this study could aid in designing more reliable waste allocation plans for waterways. The studied geometric characteristics are top width, bottom width, water depth, side-slopes and Channel length. Sheikh Zayed canal in Egypt is taken as the reference case study canal. Studied water quality variables are algae, nutrients, total dissolved solids (TDS), total suspended solids (TSS), pH, alkalinity and total inorganic carbon. It was found that concentrations of all water quality variables in water changed as a result of changing Channel Geometry. Some water quality variables such as algae, nutrients, and TSS are greatly affected, whereas others such as pH, alkalinity and total inorganic carbon are slightly affected.

Luc Illien - One of the best experts on this subject based on the ideXlab platform.

  • Sediment flux driven Channel Geometry adjustment of bedrock and mixed gravel‐bedrock rivers
    Earth Surface Processes and Landforms, 2020
    Co-Authors: Edwin Baynes, Dimitri Lague, Philippe Steer, Stéphane Bonnet, Luc Illien
    Abstract:

    Sediment supply (Qs) is often overlooked in modelling studies of landscape evolution, despite sediment playing a key role in the physical processes that drive erosion and sedimentation in river Channels. Here, we show the direct impact of the supply of coarse‐grained, hard, sediment on the Geometry of bedrock Channels from the Rangitikei river, New Zealand. Channels receiving a coarse bedload sediment supply are systematically (up to an order of magnitude) wider than Channels with no bedload sediment input for a given discharge. We also present physical model experiments of a bedrock river Channel with a fixed water discharge (1.5 l/min) under different Qs (between 0 and 20 g/l) that allow the quantification of the role of sediment in setting the width and slope of Channels and the distribution of shear stress within Channels. The addition of bedload sediment increases the width, slope, and width‐to‐depth ratio of the Channels, and increasing sediment loads promote emerging complexity in Channel morphology and shear stress distributions. Channels with low Qs are characterised by simple in‐Channel morphologies with a uniform distribution of shear stress within the Channel while Channels with high Qs are characterised by dynamic Channels with multiple active threads and a non‐uniform distribution of shear stress. We compare bedrock Channel geometries from the Rangitikei and the experiments to alluvial Channels and demonstrate that the behaviour is similar, with a transition from single thread and uniform Channels to multiple threads occurring when bedload sediment is present. In the experimental bedrock Channels, this threshold Qs is when the input sediment supply exceeds the transport capacity of the Channel. Caution is required when using the Channel Geometry to reconstruct past environmental conditions or to invert for tectonic uplift rates, because multiple configurations of Channel Geometry can exist for a given discharge, solely due to input Qs.

  • Sediment flux‐driven Channel Geometry adjustment of bedrock and mixed gravel–bedrock rivers
    Earth Surface Processes and Landforms, 2020
    Co-Authors: Edwin Baynes, Dimitri Lague, Philippe Steer, Stéphane Bonnet, Luc Illien
    Abstract:

    Sediment supply (Qs) is often overlooked in modelling studies of landscape evolution, despite sediment playing a key role in the physical processes that drive erosion and sedimentation in river Channels. Here, we show the direct impact of the supply of coarse-grained, hard, sediment on the Geometry of bedrock Channels from the Rangitikei river, New Zealand. Channels receiving a coarse bedload sediment supply are systematically (up to an order of magnitude) wider than Channels with no bedload sediment input for a given discharge. We also present physical model experiments of a bedrock river Channel with a fixed water discharge (1.5 l/min) under different Qs (between 0 and 20 g/l) that allow the quantification of the role of sediment in setting the width and slope of Channels and the distribution of shear stress within Channels. The addition of bedload sediment increases the width, slope, and width-to-depth ratio of the Channels, and increasing sediment loads promote emerging complexity in Channel morphology and shear stress distributions. Channels with low Qs are characterised by simple in-Channel morphologies with a uniform distribution of shear stress within the Channel while Channels with high Qs are characterised by dynamic Channels with multiple active threads and a non-uniform distribution of shear stress. We compare bedrock Channel geometries from the Rangitikei and the experiments to alluvial Channels and demonstrate that the behaviour is similar, with a transition from single thread and uniform Channels to multiple threads occurring when bedload sediment is present. In the experimental bedrock Channels, this threshold Qs is when the input sediment supply exceeds the transport capacity of the Channel. Caution is required when using the Channel Geometry to reconstruct past environmental conditions or to invert for tectonic uplift rates, because multiple configurations of Channel Geometry can exist for a given discharge, solely due to input Qs.

Yaghoub Behjat - One of the best experts on this subject based on the ideXlab platform.

  • Optimal design of drainage Channel Geometry parameters in vane demister liquid–gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.

  • optimal design of drainage Channel Geometry parameters in vane demister liquid gas separators
    Chemical Engineering Research & Design, 2013
    Co-Authors: Fatemeh Kavousi, Yaghoub Behjat, Shahrokh Shahhosseini
    Abstract:

    Abstract Vane liquid–gas demisters are widely used as one of the most efficient separators. To achieve higher liquid disposal and to avoid flooding, vanes are enhanced with drainage Channels. In this research, the effects of drainage Channel Geometry parameters on the droplet removal efficiency have been investigated applying CFD techniques. The observed parameters are Channel angle, Channel height and Channel length. The gas phase flow field was determined by the Eulerian method and the droplet flow field and trajectories were computed applying the Lagrangian method. The turbulent dispersion of the droplets was modeled using the discrete random walk (DRW) approach. The CFD simulation results indicate that by applying DRW model, the droplet separation efficiency predictions for small droplets are closer to the corresponding experimental data. The CFD simulation results showed that in the vane, enhanced with drainage Channels, fewer low velocity sectors were observed in the gas flow field due to more turbulence. Consequently, the droplets had a higher chance of hitting the vane walls leading to higher separation efficiency. On the other hand, the parameters affect the liquid droplet trajectory leading to the changes in separation efficiency and hydrodynamic characteristic of the vane. To attain the overall optimum Geometry of the drainage Channel, all three Geometry parameters were simultaneously studied employing 27 CFD simulation cases. To interpolate the overall optimal Geometry a surface methodology method was used to fit the achieved CFD simulation data and finally a polynomial equation was proposed.