The Experts below are selected from a list of 3006 Experts worldwide ranked by ideXlab platform
Tasawar Hayat - One of the best experts on this subject based on the ideXlab platform.
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physical significance of heat generation absorption and soret effects on peristalsis flow of Pseudoplastic Fluid in an inclined channel
Journal of Molecular Liquids, 2019Co-Authors: Tasawar Hayat, Naseema Aslam, Ijaz M Khan, A AlsaediAbstract:Abstract The present study addresses the effects of Hall current and heat generation on peristaltic flow of conducting Pseudoplastic Fluid in an inclined channel with compliant walls. Mathematical modeling is given in presence of Soret and Joule heating effects. The relevant equations are computed subject to long wavelength and low Reynolds number approximation. Equations containing material parameters are nonlinear. Perturbation technique leads to solution expressions. Graphical results of velocity, temperature, concentration and heat transfer rate are analyzed for the pertinent parameters. Trapping phenomenon is also discussed.
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Physical significance of heat generation/absorption and Soret effects on peristalsis flow of Pseudoplastic Fluid in an inclined channel
Journal of Molecular Liquids, 2019Co-Authors: Tasawar Hayat, Naseema Aslam, M. Ijaz Khan, M. Imran Khan, A AlsaediAbstract:Abstract The present study addresses the effects of Hall current and heat generation on peristaltic flow of conducting Pseudoplastic Fluid in an inclined channel with compliant walls. Mathematical modeling is given in presence of Soret and Joule heating effects. The relevant equations are computed subject to long wavelength and low Reynolds number approximation. Equations containing material parameters are nonlinear. Perturbation technique leads to solution expressions. Graphical results of velocity, temperature, concentration and heat transfer rate are analyzed for the pertinent parameters. Trapping phenomenon is also discussed.
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Variable Viscosity Effect on MHD Peristaltic Flow of Pseudoplastic Fluid in a Tapered Asymmetric Channel
Journal of Mechanics, 2016Co-Authors: Tasawar Hayat, Rija Iqbal, Anum Tanveer, A. AlsaediAbstract:AbstractInfluence of variable viscosity the peristaltic flow of Pseudoplastic Fluid in a tapered channel is discussed. The effects of magnetohydrodynamics (MHD) are also studied. Asymmetric channel is considered. The relevant problem is first formulated and then non-dimensionalized. The nonlinear different system subject to lubrication approach is solved. Expressions for pressure gradient, pressure rise and velocity are constructed. Graphs reflecting the variations of sundry parameters on pressure rise and velocity are examined. Trapping and pumping phenomena are also studied.
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impact of radial magnetic field on peristalsis in curved channel with convective boundary conditions
Journal of Magnetism and Magnetic Materials, 2016Co-Authors: Tasawar Hayat, Anum Tanveer, Fuad E Alsaadi, Ghassan MousaAbstract:Abstract This paper addresses the peristaltic flow in curved channel with combined heat/mass transfer and convective effects. The channel walls are flexible. An imposed magnetic field is applied in radial direction to increase the wave amplitude (used in ECG for synchronization purposes). The Pseudoplastic Fluid comprising shear-thinning/shear thickening effects has been used in mathematical modeling. Small Reynolds number assumption is employed to neglect inertial effects. Half channel-width to wavelength ratio is small enough for the pressure to be considered uniform over the cross-section. The graphical results obtained are compared with planar channel. Results show the non-symmetric behavior of sundry parameters in contrary to the planar case. Additionally more clear results are seen when the curved channel is approached.
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on peristaltic motion of Pseudoplastic Fluid in a curved channel with heat mass transfer and wall properties
Applied Mathematics and Computation, 2015Co-Authors: S. Hina, Tasawar Hayat, Meraj Mustafa, Naif D AlotaibiAbstract:Peristaltic motion of shear-thinning and shear-thickening Fluids through a curved channel.Elastic properties of the channel walls are considered.A regular perturbation method is used for the analytical analysis.Symmetry of the profiles in the upper and lower halves of the channel is destroyed in curved channel.Present model has importance in the blood flow through micro-circulatory system. This work addresses the combined effect of wall properties and heat/mass transfer on the peristaltic motion of Pseudoplastic (shear-thinning/shear-thickening) Fluid in a curved channel. The mathematical model is simplified through the assumption of long wavelength of the peristaltic wave compared to the mean half-width of the channel. Series solutions for stream function, temperature and concentration of species are derived. In contrast to the case of planar channel, the profiles are not symmetric about the central line of the curved channel. The size of the trapped bolus is different in the upper and lower halves of the curved channel. Moreover the number of circulations increase/decrease in the upper/lower half of the channel when the case of planar channel is approached.
Carole Levrau - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the lubrication by a Pseudoplastic Fluid: Application to wire drawing
Tribology International, 2011Co-Authors: Eric Felder, Carole LevrauAbstract:The analysis of the plane isothermal flow of a thin Pseudoplastic film with the viscosity index m is performed. The Reynolds equation related to the Newtonian case (m=1) is changed in a system of two equations, one giving the location of the zero shear stress, the other the pressure gradient. This system is applied to the analysis of the lubrication of the wire drawing with a cylindrical nozzle. We obtain so an analytical expression of the pressure Δp generated by the nozzle and the flowing thickness h 0. The approximate analysis based on the Reynolds equation overestimates Δp and h 0.
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Analysis of the lubrication by a Pseudoplastic Fluid: Application to wire drawing
Tribology International, 2011Co-Authors: Eric Felder, Carole LevrauAbstract:International audienceThe analysis of the plane isothermal flow of a thin Pseudoplastic film with the viscosity index m is performed. The Reynolds equation related to the Newtonian case (m=1) is changed in a system of two equations, one giving the location of the zero shear stress, the other the pressure gradient. This system is applied to the analysis of the lubrication of the wire drawing with a cylindrical nozzle. We obtain so an analytical expression of the pressure Δp generated by the nozzle and the flowing thickness h 0. The approximate analysis based on the Reynolds equation overestimates Δp and h 0
Takaaki Nakaya - One of the best experts on this subject based on the ideXlab platform.
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Development of sodium polyacrylate-based high-performance submucosal injection material with Pseudoplastic Fluid characteristics
ACS Biomaterials Science & Engineering, 2019Co-Authors: Ryohei Hirose, Naohisa Yoshida, Yuji Naito, Takuma Yoshida, Risa Bandou, Tomo Daidoji, Ken Inoue, Osamu Dohi, Hideyuki Konishi, Takaaki NakayaAbstract:Development of high-performance submucosal injection materials (SIMs) has significantly contributed to the advancement of rapid and safe endoscopic submucosal dissection (ESD). A previous study authored by us described that pseudo plastic Fluid was more suitable for high-performance SIMs than the Newtonian Fluid. Herein, a novel high-performance SIM is developed, which is primarily composed of sodium polyacrylate (SPA) and exhibits Pseudoplastic Fluid characteristics. As a representative of current high-performance SIMs with Newtonian Fluids characteristics, 0.4% sodium hyaluronate (HA) was selected as the target for comparison. Further, viscoelasticity, submucosal elevation height (SEH), and injection pressure (IP) of HA and SPA were evaluated. The results obtained by ESD were compared using HA or SPA in an ex vivo model. According to the measured viscoelasticity, the concentration of SPA was adjusted to 0.07%; this was aimed at obtaining the IP of SPA, which is equal to that of 0.4% HA. Moreover, no sig...
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development of sodium polyacrylate based high performance submucosal injection material with Pseudoplastic Fluid characteristics
ACS Biomaterials Science & Engineering, 2019Co-Authors: Ryohei Hirose, Naohisa Yoshida, Yuji Naito, Takuma Yoshida, Risa Bandou, Tomo Daidoji, Ken Inoue, Osamu Dohi, Hideyuki Konishi, Takaaki NakayaAbstract:The development of high-performance submucosal injection materials (SIMs) has significantly contributed to the advancement of rapid and safe endoscopic submucosal dissection (ESD). A previous study...
Philip K. Chan - One of the best experts on this subject based on the ideXlab platform.
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Measuring Mixing Time in the Agitation of Non‐Newtonian Fluids through Electrical Resistance Tomography
Chemical Engineering & Technology, 2008Co-Authors: Leila Pakzad, Farhad Ein-mozaffari, Philip K. ChanAbstract:Electrical resistance tomography (ERT), which is a non-invasive and robust measurement technique, was employed to visualize, in three dimensions, the concentration field inside a cylindrical mixing vessel equipped with a radial-flow Scaba 6SRGT impeller. The ability of ERT to work in opaque Fluids makes this technique very attractive from an industrial perspective. An ERT system with a 4-plane assembly of peripheral sensing rings, each containing 16 electrodes, was used to measure the mixing time in agitation of xanthan gum solution which is a Pseudoplastic Fluid with yield stress. An image reconstruction algorithm was used to generate images of the tracer distribution within the sensing zone. In this study, the effect of impeller speed, Fluid rheology, power consumption, and Reynolds number on the mixing time was investigated.
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Using computational Fluid dynamics modeling to study the mixing of Pseudoplastic Fluids with a Scaba 6SRGT impeller
Chemical Engineering and Processing: Process Intensification, 2008Co-Authors: Leila Pakzad, Farhad Ein-mozaffari, Philip K. ChanAbstract:The 3D flow field generated by a Scaba 6SRGT impeller in the agitation of xanthan gum, a Pseudoplastic Fluid with yield stress, was simulated using the commercial CFD package. The flow was modeled as laminar and a multiple reference frame (MRF) approach was used to solve the discretized equations of motion. The velocity profiles predicted by the simulation agreed well with those measured using ultrasonic Doppler velocimetry, a non-invasive Fluid flow measurement technique for opaque systems. Using computed velocity profiles across the impeller, the effect of Fluid rheology on the impeller flow number was investigated. The validated CFD model provided useful information regarding the formation of cavern around the impeller in the mixing of yield stress Fluids and the size of cavern predicted by the CFD model was in good agreement with that calculated using Elson's model.
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Using electrical resistance tomography and computational Fluid dynamics modeling to study the formation of cavern in the mixing of Pseudoplastic Fluids possessing yield stress
Chemical Engineering Science, 2008Co-Authors: Leila Pakzad, Farhad Ein-mozaffari, Philip K. ChanAbstract:Electrical resistance tomography (ERT) provides a non-intrusive technique to examine, in three dimensions, the homogeneity and flow pattern inside the mixing tank. In this study, a 4-plane 16-sensor ring ERT system was employed to study the shape and the size of cavern generated around a radial-flow Scaba 6SRGT impeller in the mixing of xanthan gum solution, which is a Pseudoplastic Fluid possessing yield stress. The size of cavern measured using ERT was in good agreement with that calculated using Elson's model (cylindrical model). The 3D flow field generated by the impeller in the agitation of xanthan gum was also simulated using the commercial computational Fluid dynamics (CFD) package (Fluent). The CFD model provided useful information regarding the impeller pumping capacity, flow pattern, and the formation of cavern around the impeller. CFD results showed good agreement with the experimental data and theory.
Eric Felder - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the lubrication by a Pseudoplastic Fluid: Application to wire drawing
Tribology International, 2011Co-Authors: Eric Felder, Carole LevrauAbstract:The analysis of the plane isothermal flow of a thin Pseudoplastic film with the viscosity index m is performed. The Reynolds equation related to the Newtonian case (m=1) is changed in a system of two equations, one giving the location of the zero shear stress, the other the pressure gradient. This system is applied to the analysis of the lubrication of the wire drawing with a cylindrical nozzle. We obtain so an analytical expression of the pressure Δp generated by the nozzle and the flowing thickness h 0. The approximate analysis based on the Reynolds equation overestimates Δp and h 0.
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Analysis of the lubrication by a Pseudoplastic Fluid: Application to wire drawing
Tribology International, 2011Co-Authors: Eric Felder, Carole LevrauAbstract:International audienceThe analysis of the plane isothermal flow of a thin Pseudoplastic film with the viscosity index m is performed. The Reynolds equation related to the Newtonian case (m=1) is changed in a system of two equations, one giving the location of the zero shear stress, the other the pressure gradient. This system is applied to the analysis of the lubrication of the wire drawing with a cylindrical nozzle. We obtain so an analytical expression of the pressure Δp generated by the nozzle and the flowing thickness h 0. The approximate analysis based on the Reynolds equation overestimates Δp and h 0
