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slip and induced magnetic field effects on peristaltic transport of Johnson-segalman fluid

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Applied Mathematics and Mechanics(English Edition) 2012年第8期33卷 1035-1048页

作者： T.HAYAT s.noreen A.ALsAEDI Department of Mathematics Quaid-I-Azam UniversityIslamabad 44000Pakistan Department of Mathematics Comsats Institute of Information TechnologyAttock 43600Pakistan Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

The peristaltic flow of a Johnson-segalman fluid in a planar channel is investigated in an induced magnetic field with the slip condition. The symmetric nature of the flow in a channel is utilized. The velocity slip condition in terms of shear stresses is considered. The mathematical formulation is presented, and the equations are solved under long wavelength and low Reynolds number approximations. The perturbation solutions are established for the pressure, the axial velocity, the micro-rotation component, the stream function, the magnetic-force function, the axial induced magnetic field, and the current distribution across the channel. The solution expressions for small Weissenberg numbers are derived. The flow quantities of interest are sketched and analyzed.

关键词： induced magnetic field slip condition Johnson-segalman fluid

Peristaltic Flow of shear Thinning Fluid via Temperature-Dependent Viscosity and Thermal Conductivity

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Communications in Theoretical Physics 2019年第4期71卷 367-376页

作者： s.noreen A.Malik M.M.Rashidi Department of Mathematics COMSATS University Islamabad shanghai Automotive Wind Tunnel Center Tongji University

In this paper Williamson ?uid is taken into account to study its peristaltic ?ow with heat effects. The study is carried out in a wave frame of reference for symmetric channel. Analysis of heat transfer is accomplished by accounting the effects of non-constant thermal conductivity and viscosity and viscous dissipation. Modeling of fundamental equations is followed by the construction of closed form solutions for pressure gradient, stream function and temperature while assuming Reynold's number to be very low and wavelength to be very long. Double perturbation technique is employed, considering Weissenberg number and variable ?uid property parameter to be very small. The effects of emerging parameters on pumping, trapping, axial pressure gradient, heat transfer coe?cient, pressure rise,velocity pro?le and temperature are analyzed through the graphical representation. A direct relation is observed between temperature and thermal conductivity whereas the indirect proportionality with viscosity. The heat transfer coe?cient is lower for a ?uid with variable thermal conductivity and variable viscosity as compared to the ?uid with constant thermal conductivity and constant viscosity.

关键词： temperature-dependent viscosity temperature-dependent thermal conductivity shear thinningfluid peristalsis

An analytical and numerical study of peristaltic transport of a Johnson-segalman fluid in an endoscope

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Chinese Physics B 2013年第1期22卷 374-383页

作者： noreen sher Akbar s. Nadeem DBs&H CEME National University of Sciences and Technology Islamabad Pakistan Department of Mathematics Quaid-i-Azam University 45320 Islamabad 44000 Pakistan

In the present study, we discuss the peristaltic flow of a Johnson-segalman fluid in an endoscope. Perturbation, homotopy, and numerical solutions are found for the non-linear differential equation. The comparative study is also made to check the validity of the solutions. The expressions for pressure rise frictional forces, pressure gradient, and stream lines are presented to interpret the behavior of various physical quantities of the Johnson-segalman fluid.

关键词： peristaltic pumping Johnson-segalman fluid endoscope

simulation of the second Grade Fluid Model for Blood Flow through a Tapered Artery with a stenosis

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Chinese Physics Letters 2010年第6期27卷 266-269页

作者： s. Nadeem noreen sher Akbar Department of Mathematics Quaid-i-Azam University Islamabad 44000 Pakistan

We analyze the blood flow through a tapered artery, assuming the blood to be a second order fluid model. The resulting nonlinear implicit system of partial differential equations is solved by the perturbation method. The expressions for shear stress, velocity, flow rate, wall shear stress and longitudinal impedance are obtained. The physical behavior of different parameters is also discussed, as are trapping phenomena.

关键词： sIMULATION methods & models FLUID dynamics BLOOD flow ARTERIEs sTENOsIs NONLINEAR theories IMPLICIT functions PARTIAL differential equations sTRAINs & stresses (Mechanics)

Partial slip effect on non-aligned stagnation point nanofluid over a stretching convective surface

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Chinese Physics B 2015年第1期24卷 369-376页

作者： s.Nadeem Rashid Mehmood noreen sher Akbar Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan DBs&H CEMENational University of Sciences and TechnologyIslamabadPakistan

The present study inspects the non-aligned stagnation point nano fluid over a convective surface in the presence of partial slip. Two types of base fluids namely water and kerosene are selected with Cu nanoparticles. The governing physical problem is presented and transformed into a system of coupled nonlinear differential equations using suitable similarity transformations. These equations are then solved numerically using midpoint integration scheme along with Richardson extrapolation via Maple. Impact of relevant physical parameters on the dimensionless velocity and temperature profiles are portrayed through graphs. Physical quantities such as local skin frictions co-efficient and Nusselt numbers are *** is detected from numerical computations that kerosene-based nano fluids have better heat transfer capability compared with water-based nanofluids. Moreover it is found that water-based nanofluids offer less resistance in terms of skin friction than kerosene-based fluid. In order to authenticate our present study, the calculated results are compared with the prevailing literature and a considerable agreement is perceived for the limiting case.

关键词： partial slip non-aligned stagnation point nanofluid stretching convective surface

Endoscopic Effects on Peristaltic Flow of a Nanofluid

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Communications in Theoretical Physics 2011年第10期56卷 761-768页

作者： noreen sher Akbar s.Nadeem Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan

In the present investigation we have studied the peristaltic flow of a nanofluid in an endoscope. The flow is investigated in a wave frame of reference moving with velocity of the wave c. Analytical solutions have been calculated using Homotopy perturbation method （HPM） for temperature and nanoparticle equation while exact solutions have been calculated for velocity and pressure gradient. Numerical integration have been used to obtain the graphical results for pressure rise and frictional forces. The effects of various emerging parameters are investigated for five different peristaltic waves. streamlines have been plotted at the end of the article.

关键词： peristaltic flow nanofluid endocope Homotopy perturbation method (HPM)

simulation of Variable Viscosity and Jeffrey Fluid Model for Blood Flow Through a Tapered Artery with a stenosis

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Communications in Theoretical Physics 2012年第1期57卷 133-140页

作者： noreen sher Akbar s.Nadeem Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan Department of Mathematics&Natural sciences Prince Mohammad Bin Fahd UniversityP.O.Box 1664Al Khobar 31952Kingdom of Saudi Arabia

Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the relaxation time A1 and retardation time A2. The governing equations are simplified using the case of mild stenosis. Perturbation method is used to solve the resulting equations. The effects of non-Newtonian nature of blood on velocity profile, temperature profile, wall shear stress, shearing stress at the stenotsis throat and impedance of the artery are discussed. The results for Newtonian fluid are obtained as special case from this model.

关键词： Jeffrey two constant fluid model blood flow tapered artery stenosis variable viscosity analyticalsolution

Biofluidics study in Digestive system with Thermal Conductivity of shape Nanosize H2O＋Cu Nanoparticles

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Journal of Bionic Engineering 2015年第4期12卷 656-663页

作者： noreen sher Akbar DBs&H CEME National University of Sciences and Technology Islamabad Pakistan

In the present article, peristaltic transport of copper nano fluid in a curved channel with complaint walls is studied. shape effects of nanosize particles are discussed. The mathematical formulation encompasses momentum and heat conservation equations with appropriate boundary conditions for compliant wails. sophisticated correlations are employed for thermal conductivity of the nanoparticles. The nonlinear boundary value problem is normalized with appropriate variables and closed-form solutions are derived for stream function, pressure gradient and temperature profile. A detailed study is performed for the influence of various nanoparticle geometries （bricks, cylinders and platelets）. With greater curvature value, pressure gradient is enhanced for various nanoparticle geometries. Temperature is dramatically modified with nanoparticle geometry and greater thermal conductivity is achieved with brick shaped nanoparticles in the fluid.

关键词： copper nanoparticles shape effects ofnanosize particles exact solutions curved channel wall properties peristalsis

Mathematical analysis of Phan-Thien-Tanner fluid model for blood in arteries

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International Journal of Biomathematics 2015年第5期8卷 215-230页

作者： noreen sher Akbar s. Nadeem INational University of sciences and Technology Islamabad Pakistan Department of Mathematics Quaid-i-Azam University45320 Islamabad 44000 Pakistan

In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien-Tanner fluid. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries （i.e. converging tapering, diverging tapering, non-tapered artery） have been examined for different narameters of interest.

关键词： Phan-Thien-Tanner fluid blood flow tapered artery stenosis exact solu-tions.