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Ahmed Alsaedi - One of the best experts on this subject based on the ideXlab platform.
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entropy generation and thermo diffusion effects on unsteady chemically reactive slip flow between two rotating disks
International Journal of Numerical Methods for Heat & Fluid Flow, 2019Co-Authors: Sumaira Qayyum, Muhammad Ijaz Khan, Tasawar Hayat, Ahmed AlsaediAbstract:The purpose of this study is to analyze the Entropy generation analysis and heat transport in three-dimensional flow between two stretchable disks. Joule heating and heat generation/absorption are incorporated in the thermal equation. Thermo-diffusion effect is also considered. Flow is conducting for time-dependent applied magnetic field. Induced magnetic field is not taken into consideration. Velocity and thermal slip conditions at both the disks are implemented. The flow problem is modeled by using Navier–Stokes equations with entropy generation rate and Bejan number.,Von Karman transformations are used to reduce the nonlinear governing expressions into an ordinary one and then tackled by homotopy analysis method for convergent series solutions. The nonlinear expressions for total entropy generation rate are obtained with appropriate transformations. The impacts of different flow variables on velocity, temperature, entropy generation rate and Bejan number are described graphically. Velocity, temperature and concentration gradients are discussed in the presence of flow variables.,Axial, radial and tangential velocity profiles show decreasing trend for larger values of velocity slip parameters. For a larger Brinkman number, the entropy generation increases, while a decreasing trend is noticed for Bejan number.,To the best of the authors’ knowledge, no such analyses have been reported in the literature.
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entropy generation in flow of ferromagnetic liquid with nonlinear radiation and slip condition
Journal of Molecular Liquids, 2019Co-Authors: Madiha Rashid, Ijaz M Khan, Imran M Khan, Ahmed AlsaediAbstract:Abstract Here, flow of magnetite nanoliquid by nonlinear stretching sheet is considered. Heat source/sink and nonlinear radiation are explored. Velocity and thermal slip aspects in Fe3O4-nanoliquid flow modelling are retained. Present study focuses on entropy generation analysis. Viscous dissipation, non-linear thermal radiation and joule heating irreversibilities are accounted. Formulated problems computed by Optimal Homotopy algorithm. The velocity, temperature, entropy generation, Bejan number, skin friction and heat transfer rate are discussed. It is observed that entropy generation rates enhances for Brinkman number and solid volume fraction of nanoparticles while reverse behavior of Bejan number holds.
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entropy generation for flow of sisko fluid due to rotating disk
Journal of Molecular Liquids, 2018Co-Authors: Sumaira Qayyum, Muhammad Imran Khan, Ahmed AlsaediAbstract:Abstract This investigation deals with entropy generation optimization and nonlinear dissipative flow of Sisko fluid due to a rotating disk. Joule heating effect is considered. Mathematical model is obtained for the present flow problem. Nonlinear systems are solved for convergent series solutions. Analysis of various flow variables on Bejan number, volumetric entropy generation rate, temperature and velocity are discussed. Present analysis depicts that irreversibility rate (entropy generation rate) and Bejan number are enhanced for radiation parameter, whereas reverse behavior is noticed for Brinkman number and material parameter. The velocity and temperature fields are increasing for larger material parameter and temperature ratio parameter. The obtained results are helpful in understanding the irreversibility (entropy generation) for flow of non-Newtonian fluids. Comparative study is made for temperature, velocity, Bejan number and entropy generation by considering shear thickening and thinning fluids. Finally, a comparison is given with the previous available results.
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entropy generation in magnetohydrodynamic radiative flow due to rotating disk in presence of viscous dissipation and joule heating
Physics of Fluids, 2018Co-Authors: Tasawar Hayat, Muhammad Ijaz Khan, Sumaira Qayyum, Ahmed AlsaediAbstract:Simultaneous effects of viscous dissipation and Joule heating in flow by rotating disk of variable thickness are examined. Radiative flow saturating porous space is considered. Much attention is given to entropy generation outcome. Developed nonlinear ordinary differential systems are computed for the convergent series solutions. Specifically, the results of velocity, temperature, entropy generation, Bejan number, coefficient of skin friction, and local Nusselt number are discussed. Clearly the entropy generation rate depends on velocity and temperature distributions. Moreover the entropy generation rate is a decreasing function of Hartmann number, Eckert number, and Reynolds number, while they gave opposite behavior for Bejan numbers.
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entropy generation in peristalsis with different shapes of nanomaterial
Journal of Molecular Liquids, 2017Co-Authors: Sadaf Nawaz, Ahmed AlsaediAbstract:Abstract The purpose of present study is to analyze peristalsis in a vertical channel by using different shapes of nanomaterial. The nanomaterial utilized for this purpose is silver (Ag) with water as base fluid. The study is based on the comparison among different shapes of nanoparticles (bricks, cylinders and platelets). The walls of channel are of flexible nature. Study is done in the light of long wavelength and low Reynolds number approximations. Solution technique utilized here is perturbation with Grashof number as perturbation parameter. Entropy generation analysis is also carried out with different shapes of nanoparticles. The graphs of Bejan number, entropy generation, velocity and temperature are drawn for the sake of comparison for the considered nanoparticles. Streamlines are also studied. The results lead to the fact that an increase in nanomaterial volume fraction decays the velocity and temperature of the nanofluid. The Hall parameter and Hartman number show opposite behavior for velocity, temperature, entropy generation and Bejan number. Highest values of temperature, Bejan number and entropy generation have been seen for brick shaped particles and smallest for platelet shaped particles.
Tasawar Hayat - One of the best experts on this subject based on the ideXlab platform.
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salient features of dufour and soret effect in radiative mhd flow of viscous fluid by a rotating cone with entropy generation
International Journal of Hydrogen Energy, 2020Co-Authors: Sohail A Khan, Tasawar Hayat, Ijaz M Khan, A AlsaediAbstract:Abstract Background Here physical characteristics of convective magnetohydrodynamic flow of viscous liquid subject to a rotating cone are discussed. Dissipation, Joule heating, thermal flux and heat generation/absorption are scrutinized in energy expression. Physical aspects of diffusion-thermo and thermo diffusion effect are deliberated. Thermo-diffusion is the mechanisms of transportation in which particles are transferred in a multi-factor mixture determined by temperature gradient. Furthermore irreversibility analysis is considered. Method Nonlinear partial differential system are reduced to ordinary one with the help of similarity variables. Here we implemented ND solve technique to get numerical results for given nonlinear system. Results Characteristics of influential variables for entropy optimization, velocity, concentration, Bejan number and temperature are scrutinized. Numerical outcomes of gradient of velocity and Nusselt and Sherwood numbers are examined through tabulated form. Velocity components are declined against higher velocity slip parameters. For larger estimation of heat generation and radiation parameters the temperature is upsurges. Entropy generation and Bejan number are boost up via rising values of diffusion and radiation parameters. For larger estimation of Brinkman number both Bejan number and entropy rate have opposite effect. Comparative studies of the current and previous results are discussed in tabularized form and have a good agreement.
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entropy generation and thermo diffusion effects on unsteady chemically reactive slip flow between two rotating disks
International Journal of Numerical Methods for Heat & Fluid Flow, 2019Co-Authors: Sumaira Qayyum, Muhammad Ijaz Khan, Tasawar Hayat, Ahmed AlsaediAbstract:The purpose of this study is to analyze the Entropy generation analysis and heat transport in three-dimensional flow between two stretchable disks. Joule heating and heat generation/absorption are incorporated in the thermal equation. Thermo-diffusion effect is also considered. Flow is conducting for time-dependent applied magnetic field. Induced magnetic field is not taken into consideration. Velocity and thermal slip conditions at both the disks are implemented. The flow problem is modeled by using Navier–Stokes equations with entropy generation rate and Bejan number.,Von Karman transformations are used to reduce the nonlinear governing expressions into an ordinary one and then tackled by homotopy analysis method for convergent series solutions. The nonlinear expressions for total entropy generation rate are obtained with appropriate transformations. The impacts of different flow variables on velocity, temperature, entropy generation rate and Bejan number are described graphically. Velocity, temperature and concentration gradients are discussed in the presence of flow variables.,Axial, radial and tangential velocity profiles show decreasing trend for larger values of velocity slip parameters. For a larger Brinkman number, the entropy generation increases, while a decreasing trend is noticed for Bejan number.,To the best of the authors’ knowledge, no such analyses have been reported in the literature.
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optimization of entropy generation and dissipative nonlinear radiative von karman s swirling flow with soret and dufour effects
Journal of Molecular Liquids, 2018Co-Authors: Sumaira Qayyum, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, A AlsaediAbstract:Abstract A computational investigation has been accomplished on nonlinear radiative flow between two impermeable stretchable rotating disks. Thermo-diffusion and diffusion-thermo effects are also implemented. Furthermore nonlinear radiative heat flux, heat source/sink, dissipation and chemical reaction are considered. Thermodynamics second law is used for the investigation of entropy generation and Bejan number. Total entropy generation is inspected for various flow variables. Von Karman similarity transformations are utilized to develop coupled nonlinear ordinary differential systems and then tackled by semi computational/analytical technique namely homotopy technique. Particular consideration is given to the convergence procedure. The impacts of different flow variables like magnetic interaction, porosity, thermal diffusion, Prandtl number, diffusion thermo, radiative flux, heat source/sink, Schmidt number and chemical reaction variables on fluid velocity, concentration, temperature, volumetric entropy generation rate and Bejan number are discussed and analyzed. Velocity, temperature and concentration gradients at the disk surface are calculated numerically and discussed through the tables. Velocity reduces for both Hartman number and porosity parameter. Hartman number and radiation parameter enhances the entropy generation and Bejan number. Final conclusions of present flow analysis have been presented through concluding remarks.
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entropy generation in magnetohydrodynamic radiative flow due to rotating disk in presence of viscous dissipation and joule heating
Physics of Fluids, 2018Co-Authors: Tasawar Hayat, Muhammad Ijaz Khan, Sumaira Qayyum, Ahmed AlsaediAbstract:Simultaneous effects of viscous dissipation and Joule heating in flow by rotating disk of variable thickness are examined. Radiative flow saturating porous space is considered. Much attention is given to entropy generation outcome. Developed nonlinear ordinary differential systems are computed for the convergent series solutions. Specifically, the results of velocity, temperature, entropy generation, Bejan number, coefficient of skin friction, and local Nusselt number are discussed. Clearly the entropy generation rate depends on velocity and temperature distributions. Moreover the entropy generation rate is a decreasing function of Hartmann number, Eckert number, and Reynolds number, while they gave opposite behavior for Bejan numbers.
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effectiveness of entropy generation and energy transfer on peristaltic flow of jeffrey material with darcy resistance
International Journal of Heat and Mass Transfer, 2017Co-Authors: Tasawar Hayat, S Farooq, Bashir Ahmad, A AlsaediAbstract:Abstract The primary goal of present article is to analyze the entropy generation on peristaltic flow of Jeffrey material in a curved configuration. Velocity and thermal slip conditions are invoked. An incompressible fluid in a channel saturates the porous space. Modelling is based upon modified Darcy’s law for Jeffrey fluid. Large wavelength and low Reynolds number approximations are utilized. Exact solutions of the resulting system of differential equations with corresponding boundary conditions are computed. Further analysis is made for the pressure gradient, stream function, velocity of the fluid, temperature, entropy generation and Bejan number. It is found that entropy generation and Bejan number are more visible in the vicinity of the channel walls when compared at the channel center.
Herlinda Dos Santos Maria - One of the best experts on this subject based on the ideXlab platform.
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Pengaruh Latihan Beban dan Kecepatan Reaksi Tangan Terhadap Kecepatan Kombinasi Pukulan Kizami Gyaku Tsuki Pada Karate-ka Inkanas UNM
2016Co-Authors: Herlinda Dos Santos MariaAbstract:ABSTRAK MARIA HERLINDA DOS SANTOS, 2016. Pengaruh Latihan Beban dan Kecepatan Reaksi Tangan Terhadap Kecepatan Kombinasi Pukulan Kizami Gyaku Tsuki Pada Karate-ka Inkanas UNM.(Dibimbing Oleh Andi Ihsan dan Rahmat Kasmad) Penelitian ini bertujuan untuk mengetahui: (1) perbedaan hasil kecepatan kombinasi pukulan kizami gyaku tsuki karate-ka Inkanas UNM yang dilatih metode latihan beban push up cepat dan yang dilatih dengan metode latihan beban cable crossover, (2) interaksi antara metode latihan dan kecepatan reaksi tangan terhadap kecepatan kombinasi pukulan kizami gyaku tsuki, (3) pengaruh hasilkecepatan Kizami Gyaku Tsuki padakarateka yang dilatih dengan metode latihan bebanpush up cepat dan metode latihan beban cable crossover terhadap karateka yang memiliki kecepatan reaksi tangan tinggi , dan (4) pengaruh hasil kecepatan Kizami Gyaku Tsuki padakarateka yang dilatih dengan metode latihan bebanpush up cepat dan metode latihan beban cable crossover terhadap karateka yang memiliki kecepatan reaksi tangan rendah. Penelitian ini merupakan penelitian eksperimen dengan jenis factorial design dengan bentuk desaintreatment by level design . Populasi dalam penelitian ini adalah seluruh atlet karate Inkanas UNM dengan sampel sebanyak 20karate-ka, 10karate-ka adalah kelompok latihan beban push up cepat dan 10karate-kadalam kelompok latihan beban cable crossover.Teknik penentuan sampelnya adalah random sampling. Teknik analisa data yang digunakan adalah analisis statistik deskriptif danANAVA 2 jalur dengan bantuan program komputer SPSS versi 20 dengan taraf kepercayaan 0.05% (95%). Berdasarkan hasil penelitian dapat disimpulkan sebagai berikut: (1) secara keseluruhan hasil kecepatan pukulan kizami gyaku tsuki karateka Inkanas UNM yang dilatih dengan metode latihan push up cepat lebih baik dibandingkan dengan hasil kecepatan pukulan kizami gyaku tsuki kelompok yang dilatih dengan metodel latihan cable crossover, dengan rata-rata kelompok latihan beban push up cepat sebesar 15.40 dan total rata-rata kelompok latihan beban cable crossover sebesar 14.30(2) terdapat interaksi antara metode latihan beban dengan kecepatan reaksi tangan terhadap hasil kecepatan pukulan kizami gyaku tsuki melalui metode latihan push up cepat lebih baik disbanding dengan latihan beban cable crossover. (3) bagi karateka yang memiliki kecepatan reaksi tangan tinggi, hasil kecepatan pukulan kizami gyaku tsuki melalui metode latihan push up cepat lebih baik dibanding dengan metode latihan beban cable crossover. (4) bagi karateka yang memiliki kecepatan reaksi tangan rendah, hasil kecepatan pukulan kizami gyaku tsuki melalui metode latihan push up cepat lebih baik dibanding dengan metode latihan beban cable crossover.Hasil kecepatan pukulan kizami gyaku tsuki melalui penerapan metode latihan beban push up cepat dan metode latihan beban cable crossover tidak memberikan perbedaan yang signifikan
Gh H R Kefayati - One of the best experts on this subject based on the ideXlab platform.
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simulation of double diffusive mhd magnetohydrodynamic natural convection and entropy generation in an open cavity filled with power law fluids in the presence of soret and dufour effects part ii entropy generation
Energy, 2016Co-Authors: Gh H R KefayatiAbstract:In this paper, entropy generation of associated with double diffusive natural convection of non-Newtonian power-law fluids in an open cavity in the presence of a horizontal magnetic field, studying Soret and Dufour parameters has been analyzed by FDLBM (Finite Difference Lattice Boltzmann method). This study has been performed for the certain pertinent parameters of Rayleigh number (Ra = 104 and 105), Hartmann number (Ha = 0, 15, and 30), power-law index (n = 0.6, 1, and 1.4), Lewis number (Le = 2.5 and 5), Dufour parameter (Df = 0, 1, and 5), Soret parameter (Sr = 0, 1, and 5) and the buoyancy ratio (N = −1and 1). Results indicate that the augmentation of the thermal Rayleigh number enhances different entropy generations and declines the average Bejan number. The increase in the Hartmann number provokes various irreversibilities to enhance and the average Bejan number decreases significantly. The enhancement of Lewis number and buoyancy ratio affect various entropy generations and the average Bejan number. The rise of Soret and Dufour parameters enhances the entropy generations due to heat transfer and fluid friction. The change of power-law index alters various entropy generations, but the alteration does not follow a specific manner in different studied parameters.
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Simulation of double diffusive natural convection and entropy generation of power-law fluids in an inclined porous cavity with Soret and Dufour effects (Part II: Entropy generation)
International Journal of Heat and Mass Transfer, 2016Co-Authors: Gh H R KefayatiAbstract:In this paper, entropy generation of associated with double diffusive natural convection of non-Newtonian power-law fluids in an inclined porous cavity has been analyzed by Finite Difference Lattice Boltzmann Method (FDLBM). The entropy generations due to fluid friction, heat and mass transfer have been simulated and analyzed for the certain pertinent parameters of thermal Rayleigh number (RaT =104 and 105), Darcy number (Da =10-4, 10-3, and 10-2), power-law index (n =0.6-1.4), Lewis number (Le =2.5 and 5), inclined angles (θ =0°, 40°, 80°, and 120°), Dufour parameter (Df =0, 1, and 5), Soret parameter (Sr =0, 1, and 5) and the buoyancy ratio (N =-1 and 1). Results indicate that the augmentation of the thermal Rayleigh number enhances different entropy generations and declines the average Bejan number. The increase in the Darcy number provokes various irreversibilities to enhance and the average Bejan number decreases significantly. The augmentation of the inclined angle from θ =0° to 40° enhances various total entropy generations and plummets the average Bejan number. The increase in the inclined angle from θ =40° to 80° results in the drop of different total entropy generations and rises the average Bejan number. The rise of Soret and Dufour parameters enhances the entropy generations due to heat transfer and fluid friction. The change of power-law index alters various entropy generations, but the alteration does not follow a specific manner in different studied parameters.
A Alsaedi - One of the best experts on this subject based on the ideXlab platform.
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salient features of dufour and soret effect in radiative mhd flow of viscous fluid by a rotating cone with entropy generation
International Journal of Hydrogen Energy, 2020Co-Authors: Sohail A Khan, Tasawar Hayat, Ijaz M Khan, A AlsaediAbstract:Abstract Background Here physical characteristics of convective magnetohydrodynamic flow of viscous liquid subject to a rotating cone are discussed. Dissipation, Joule heating, thermal flux and heat generation/absorption are scrutinized in energy expression. Physical aspects of diffusion-thermo and thermo diffusion effect are deliberated. Thermo-diffusion is the mechanisms of transportation in which particles are transferred in a multi-factor mixture determined by temperature gradient. Furthermore irreversibility analysis is considered. Method Nonlinear partial differential system are reduced to ordinary one with the help of similarity variables. Here we implemented ND solve technique to get numerical results for given nonlinear system. Results Characteristics of influential variables for entropy optimization, velocity, concentration, Bejan number and temperature are scrutinized. Numerical outcomes of gradient of velocity and Nusselt and Sherwood numbers are examined through tabulated form. Velocity components are declined against higher velocity slip parameters. For larger estimation of heat generation and radiation parameters the temperature is upsurges. Entropy generation and Bejan number are boost up via rising values of diffusion and radiation parameters. For larger estimation of Brinkman number both Bejan number and entropy rate have opposite effect. Comparative studies of the current and previous results are discussed in tabularized form and have a good agreement.
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theoretical investigation of ree eyring nanofluid flow with entropy optimization and arrhenius activation energy between two rotating disks
Computer Methods and Programs in Biomedicine, 2019Co-Authors: Sohail A Khan, Ijaz M Khan, A AlsaediAbstract:Abstract Background and objective Improvement of high performance thermal systems for heat transport augmentation has become quite prevalent nowadays. Various works have been performed to pick up a comprehension of the heat transport execution for their practical utilization to heat transport augmentation. Therefore, the nanomaterial has been used in flow of Ree-Eyring fluid between two rotating disks for thermal conductivity enhancement of base fluid. Heat transfer characteristics are discussed through viscous dissipation and heat source/sink. Behaviors of Brownian motion and thermophoresis are also examinted. Physical behaviors of irreversibility in nanofluid with Arrhenius activation energy are also accounted. Methods The nonlinear systems lead to ordinary differential problems through implementation of appropriate transformations. The relevant problems are tackled by (OHAM) Optimal homotopic method for series solutions. Results Effects of various physical parameters on the velocity, entropy rate, Bejan number, concentration and temperature are discussed graphically. Skin friction coefficient and gradient of temperature are numerically examined and discussed with various parameters. Conclusions Entropy generation rate is control by minimizing the values of Brinkman number and stretching parameter. Entropy rate and Bejan number show the dual behaviors against Eckert number. Both decay near the lower disk while reverse holds near the upper disk. Entropy rate and Bejan number show similar behaviors for Weissenberg number.
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optimization of entropy generation and dissipative nonlinear radiative von karman s swirling flow with soret and dufour effects
Journal of Molecular Liquids, 2018Co-Authors: Sumaira Qayyum, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, A AlsaediAbstract:Abstract A computational investigation has been accomplished on nonlinear radiative flow between two impermeable stretchable rotating disks. Thermo-diffusion and diffusion-thermo effects are also implemented. Furthermore nonlinear radiative heat flux, heat source/sink, dissipation and chemical reaction are considered. Thermodynamics second law is used for the investigation of entropy generation and Bejan number. Total entropy generation is inspected for various flow variables. Von Karman similarity transformations are utilized to develop coupled nonlinear ordinary differential systems and then tackled by semi computational/analytical technique namely homotopy technique. Particular consideration is given to the convergence procedure. The impacts of different flow variables like magnetic interaction, porosity, thermal diffusion, Prandtl number, diffusion thermo, radiative flux, heat source/sink, Schmidt number and chemical reaction variables on fluid velocity, concentration, temperature, volumetric entropy generation rate and Bejan number are discussed and analyzed. Velocity, temperature and concentration gradients at the disk surface are calculated numerically and discussed through the tables. Velocity reduces for both Hartman number and porosity parameter. Hartman number and radiation parameter enhances the entropy generation and Bejan number. Final conclusions of present flow analysis have been presented through concluding remarks.
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effectiveness of entropy generation and energy transfer on peristaltic flow of jeffrey material with darcy resistance
International Journal of Heat and Mass Transfer, 2017Co-Authors: Tasawar Hayat, S Farooq, Bashir Ahmad, A AlsaediAbstract:Abstract The primary goal of present article is to analyze the entropy generation on peristaltic flow of Jeffrey material in a curved configuration. Velocity and thermal slip conditions are invoked. An incompressible fluid in a channel saturates the porous space. Modelling is based upon modified Darcy’s law for Jeffrey fluid. Large wavelength and low Reynolds number approximations are utilized. Exact solutions of the resulting system of differential equations with corresponding boundary conditions are computed. Further analysis is made for the pressure gradient, stream function, velocity of the fluid, temperature, entropy generation and Bejan number. It is found that entropy generation and Bejan number are more visible in the vicinity of the channel walls when compared at the channel center.