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Tasawar Hayat - One of the best experts on this subject based on the ideXlab platform.
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magneto rotating flow of hybrid nanofluid with entropy generation
Computer Methods and Programs in Biomedicine, 2020Co-Authors: Ijaz M Khan, Tasawar Hayat, M U Hafeez, Imran M Khan, A AlsaediAbstract:Abstract Background Study of nanofluids has been enormously increased for the last couple of years. Regardless of some irregularity in the revealed outcomes and lacking consistency, yet the mechanisms of heat transport have been emerged as highly efficient. In the continuation of nanomaterials research, the investigators and analyst have also attempted to utilize hybrid nanomaterial recently, which is designed by suspending unique nanomaterials (nanoparticles) either in mixture or composite structure. The theory of hybrid nanofluids can be further modified for heat transport and pressure drop attributes by trade-off between disadvantages and advantages of individual suspension, ascribed to great aspect ratio, better thermal system and synergistic impact of nanomaterials. Therefore, we have conducted a theoretical attempt on MHD entropy optimized viscous hybrid nanomaterial flow between two parallel plates. The boundaries of plates are fixed with velocity and thermal slip aspects. Chemical reaction with novel aspect of activation energy is accounted. Furthermore, thermal radiation, heat generation and Joule heating are examined. Method The modeled system is numerically simulated through bvp4c technique. Results Behaviors of pertinent variables on the velocity, skin friction, temperature, Nusselt Number, entropy generation rate and concentration are presented and discussed through different graphs. Temperature field decays against higher values of Eckert Number and thermal slip variable. Conclusions It is noticed that velocity of material particles increase against larger estimations of rotation parameter. Temperature declines versus larger Prandtl and Eckert Numbers. Concentration decays when an enhancement is occurred in the Lewis Number. Magnitude of surface drag force upsurges for rising values of Prandtl Number and radiation parameter. Furthermore, magnitude of Nusselt Number enhances through larger Eckert Number, magnetic Number and Prandtl Number.
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modeling and computational analysis of hybrid class nanomaterials subject to entropy generation
Computer Methods and Programs in Biomedicine, 2019Co-Authors: Ijaz M Khan, Tasawar Hayat, A Alsaedi, Niaz B KhanAbstract:Abstract Background and objective Nanoliquids are dilute suspensions of nanoparticles with at least one of their principal dimensions smaller than 100 nm. Form literature, nanoliquids have been found to possess increased thermos-physical characteristics like thermal diffusivity, thermal conductivity, convective heat transport coefficients and viscosity associated to those of continuous phase liquids foe example oil, ethylene glycol and water. Nanoliquids have novel characteristics that make them possibly beneficial in numerous applications in heat transport like fuel cells, microelectronics, hybrid-powered engines, pharmaceutical processes, domestic refrigerator, engine cooling thermal management, chiller and heat exchanger. The above applications of nanofluids/hybrid nanofluids insist the researchers and engineers to develop new methodologies and technique in the field of heat transport. Therefore, we have considered mixed convective flow hybrid nanomaterial over a convectively heated surface of disk. Flow nature is discussed due to stretchable rotating surface of disk. Applied magnetic field is accounted. Ohmic heating and dissipation effects are utilized in the modeling of energy expression. Total entropy rate is calculated. Methods Suitable transformation leads to ordinary differential equations. Shooting method is implemented for numerical outcomes. Comparative analysis is made for the present result with published ones. Results The effects of key parameters like magnetic parameter, mixed convection variable and Eckert and Biot Numbers on the dimensionless velocity, surface drag force, temperature, (heat transfer rate) Nusselt Number and entropy rate are discussed in detail and presented graphically. Furthermore, the outcomes demonstrate that velocity of liquid particles decline against magnetic parameter. Temperature and associated layer upsurge versus magnetic parameter and Eckert Number. Skin friction coefficient (drag force) improves through higher values of stretching and magnetic variables. Heat transfer rate is more for higher Eckert Number and magnetic parameter. Entropy rate is also enhances against Eckert Number and Brickman Number. Conclusions Magnitude of surface drag force increases for higher values of stretching and magnetic variables. Magnitude of heat transfer rate is more when magnetic variable and Eckert Number attain the maximum values. Brinkman Number is used to decrease the entropy rate. Furthermore, velocity and temperature show contrast behavior versus magnetic parameter i.e., velocity of fluid particles decreases.
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entropy generation minimization egm for convection nanomaterial flow with nonlinear radiative heat flux
Journal of Molecular Liquids, 2018Co-Authors: Muhammad Ijaz Khan, Tasawar Hayat, Muhammad Imran Khan, Siraj Ullah, Ahmed AlsaediAbstract:Abstract Here entropy generation and magnetohydrodynamics (MHD) impacts in unsteady viscous nanoliquid flow are elaborated. Flow induced is by impermeable rotating disk. Application of thermodynamic second law is employed for the analysis of entropy generation. Nanofluid characteristics have been addressed through thermophoresis and Brownian movement. Nonlinear versions of mixed convection and thermal radiation are introduced simultaneously. The process of non-dimensionalization is performed via implementation of suitable variables. Nonlinear computations have been carried out. The rate of total entropy generation is evaluated for distinct arising variables. Skin-friction and Nusselt and Sherwood Numbers in addition to velocity, temperature and nanoparticles concentration are emphasized. We found increasing trend in temperature and velocity for unsteadiness factor whereas opposite scenario is noticed regarding nanoparticles concentration. Entropy generation rate enhances with increasing of Brinkman Number, Eckert Number and magnetic parameter while the opposite behavior is recorded for Reynolds Number. While Bejan Number has direct relation to Eckert Number, Reynolds Number, and magnetic parameter, While for Brinkman Number the situation is opposite. Moreover the surface acts as effective source of irreversibility when entropy generation rate is closed to the surface is higher.
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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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hydromagnetic boundary layer flow of williamson fluid in the presence of thermal radiation and ohmic dissipation
alexandria engineering journal, 2016Co-Authors: Tasawar Hayat, Anum Shafiq, A AlsaediAbstract:Abstract This paper is concerned with the unsteady two-dimensional boundary layer flow of an incompressible Williamson fluid over an unsteady permeable stretching surface with thermal radiation. Effects of electric and magnetic fields are considered. The nonlinear boundary layer partial differential equations are first converted into the system of ordinary differential equations and then solved analytically. Effects of physical parameters such as Weissenberg Number, unsteadiness parameter, suction parameter, magnetic parameter, electric parameter, radiation parameter, Prandtl Number and Eckert Number on the velocity and temperature are graphically analyzed. The expressions of skin friction coefficient and local Nusselt Number are presented and examined numerically.
A Alsaedi - One of the best experts on this subject based on the ideXlab platform.
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magneto rotating flow of hybrid nanofluid with entropy generation
Computer Methods and Programs in Biomedicine, 2020Co-Authors: Ijaz M Khan, Tasawar Hayat, M U Hafeez, Imran M Khan, A AlsaediAbstract:Abstract Background Study of nanofluids has been enormously increased for the last couple of years. Regardless of some irregularity in the revealed outcomes and lacking consistency, yet the mechanisms of heat transport have been emerged as highly efficient. In the continuation of nanomaterials research, the investigators and analyst have also attempted to utilize hybrid nanomaterial recently, which is designed by suspending unique nanomaterials (nanoparticles) either in mixture or composite structure. The theory of hybrid nanofluids can be further modified for heat transport and pressure drop attributes by trade-off between disadvantages and advantages of individual suspension, ascribed to great aspect ratio, better thermal system and synergistic impact of nanomaterials. Therefore, we have conducted a theoretical attempt on MHD entropy optimized viscous hybrid nanomaterial flow between two parallel plates. The boundaries of plates are fixed with velocity and thermal slip aspects. Chemical reaction with novel aspect of activation energy is accounted. Furthermore, thermal radiation, heat generation and Joule heating are examined. Method The modeled system is numerically simulated through bvp4c technique. Results Behaviors of pertinent variables on the velocity, skin friction, temperature, Nusselt Number, entropy generation rate and concentration are presented and discussed through different graphs. Temperature field decays against higher values of Eckert Number and thermal slip variable. Conclusions It is noticed that velocity of material particles increase against larger estimations of rotation parameter. Temperature declines versus larger Prandtl and Eckert Numbers. Concentration decays when an enhancement is occurred in the Lewis Number. Magnitude of surface drag force upsurges for rising values of Prandtl Number and radiation parameter. Furthermore, magnitude of Nusselt Number enhances through larger Eckert Number, magnetic Number and Prandtl Number.
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modeling and computational analysis of hybrid class nanomaterials subject to entropy generation
Computer Methods and Programs in Biomedicine, 2019Co-Authors: Ijaz M Khan, Tasawar Hayat, A Alsaedi, Niaz B KhanAbstract:Abstract Background and objective Nanoliquids are dilute suspensions of nanoparticles with at least one of their principal dimensions smaller than 100 nm. Form literature, nanoliquids have been found to possess increased thermos-physical characteristics like thermal diffusivity, thermal conductivity, convective heat transport coefficients and viscosity associated to those of continuous phase liquids foe example oil, ethylene glycol and water. Nanoliquids have novel characteristics that make them possibly beneficial in numerous applications in heat transport like fuel cells, microelectronics, hybrid-powered engines, pharmaceutical processes, domestic refrigerator, engine cooling thermal management, chiller and heat exchanger. The above applications of nanofluids/hybrid nanofluids insist the researchers and engineers to develop new methodologies and technique in the field of heat transport. Therefore, we have considered mixed convective flow hybrid nanomaterial over a convectively heated surface of disk. Flow nature is discussed due to stretchable rotating surface of disk. Applied magnetic field is accounted. Ohmic heating and dissipation effects are utilized in the modeling of energy expression. Total entropy rate is calculated. Methods Suitable transformation leads to ordinary differential equations. Shooting method is implemented for numerical outcomes. Comparative analysis is made for the present result with published ones. Results The effects of key parameters like magnetic parameter, mixed convection variable and Eckert and Biot Numbers on the dimensionless velocity, surface drag force, temperature, (heat transfer rate) Nusselt Number and entropy rate are discussed in detail and presented graphically. Furthermore, the outcomes demonstrate that velocity of liquid particles decline against magnetic parameter. Temperature and associated layer upsurge versus magnetic parameter and Eckert Number. Skin friction coefficient (drag force) improves through higher values of stretching and magnetic variables. Heat transfer rate is more for higher Eckert Number and magnetic parameter. Entropy rate is also enhances against Eckert Number and Brickman Number. Conclusions Magnitude of surface drag force increases for higher values of stretching and magnetic variables. Magnitude of heat transfer rate is more when magnetic variable and Eckert Number attain the maximum values. Brinkman Number is used to decrease the entropy rate. Furthermore, velocity and temperature show contrast behavior versus magnetic parameter i.e., velocity of fluid particles decreases.
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hydromagnetic boundary layer flow of williamson fluid in the presence of thermal radiation and ohmic dissipation
alexandria engineering journal, 2016Co-Authors: Tasawar Hayat, Anum Shafiq, A AlsaediAbstract:Abstract This paper is concerned with the unsteady two-dimensional boundary layer flow of an incompressible Williamson fluid over an unsteady permeable stretching surface with thermal radiation. Effects of electric and magnetic fields are considered. The nonlinear boundary layer partial differential equations are first converted into the system of ordinary differential equations and then solved analytically. Effects of physical parameters such as Weissenberg Number, unsteadiness parameter, suction parameter, magnetic parameter, electric parameter, radiation parameter, Prandtl Number and Eckert Number on the velocity and temperature are graphically analyzed. The expressions of skin friction coefficient and local Nusselt Number are presented and examined numerically.
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hydromagnetic boundary layer flow of williamson fluid in the presence of thermal radiation and ohmic dissipation
alexandria engineering journal, 2016Co-Authors: Tasawar Hayat, Anum Shafiq, A AlsaediAbstract:Abstract This paper is concerned with the unsteady two-dimensional boundary layer flow of an incompressible Williamson fluid over an unsteady permeable stretching surface with thermal radiation. Effects of electric and magnetic fields are considered. The nonlinear boundary layer partial differential equations are first converted into the system of ordinary differential equations and then solved analytically. Effects of physical parameters such as Weissenberg Number, unsteadiness parameter, suction parameter, magnetic parameter, electric parameter, radiation parameter, Prandtl Number and Eckert Number on the velocity and temperature are graphically analyzed. The expressions of skin friction coefficient and local Nusselt Number are presented and examined numerically.
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peristaltic transport of nanofluid in a compliant wall channel with convective conditions and thermal radiation
Journal of Molecular Liquids, 2016Co-Authors: Tasawar Hayat, Z Nisar, Humaira Yasmin, A AlsaediAbstract:Abstract Impact of thermal radiation on peristaltic transport of nanofluid in a channel satisfying wall properties and convective conditions is investigated. The considered model of nanofluid includes the effects of Brownian motion and thermophoresis. Long wavelength and low Reynolds Number approach is followed in the mathematical modeling and development of solutions. Shooting technique is implemented for the numerical solutions of resulting nonlinear differential systems. The salient features of pertinent parameters like Brownian motion parameter, thermophoresis parameter, thermal radiation parameter, Prandtl Number and Eckert Number on the physical quantities of interest are discussed. It is found that the influence of thermal radiation parameter and the Biot Number on the temperature and concentration are quite opposite. Further the heat transfer coefficient decreases when thermal radiation parameter is increased.
C S Bagewadi - One of the best experts on this subject based on the ideXlab platform.
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boundary layer flow and heat transfer of a dusty fluid flow over a stretching sheet with non uniform heat source sink
International Journal of Multiphase Flow, 2011Co-Authors: B J Gireesha, G K Ramesh, Subhas M Abel, C S BagewadiAbstract:Abstract The present paper deals with the analysis of boundary layer flow and heat transfer of a dusty fluid over a stretching sheet with the effect of non-uniform heat source/sink. Here we consider two types of heating processes namely (i) prescribed surface temperature and (ii) prescribed surface heat flux. The momentum and thermal boundary layer equations of motion are solved numerically using Runge Kutta Fehlberg fourth–fifth order method (RKF45 Method). The effects of fluid particle interaction parameter, Eckert Number, Prandtl Number, Number of dust particle and non-uniform heat generation/absorption parameter on temperature distribution are analyzed and also the effect of wall temperature gradient function and wall temperature function are tabulated and discussed.
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boundary layer flow of an unsteady dusty fluid and heat transfer over a stretching sheet with non uniform heat source sink
Engineering, 2011Co-Authors: B J Gireesha, Govinakovi S Roopa, C S BagewadiAbstract:An analysis has been carried out to study the effect of hydrodynamic laminar boundary layer flow and heat transfer of a dusty fluid over an unsteady stretching surface in the presence of non-uniform heat source/sink. Heat transfer characteristics are examined for two different kinds of boundary conditions, namely 1) variable wall temperature and 2) variable heat flux. The governing partial differential equations are transformed to system of ordinary differential equations. These equations are solved numerically by applying RKF-45 method. The effects of various physical parameters such as magnetic parameter, dust interaction parameter, Number density, Prandtl Number, Eckert Number, heat source/sink parameter and unsteadiness parameter on velocity and temperature profiles are studied.
M Hatami - One of the best experts on this subject based on the ideXlab platform.
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fe3o4 ch2oh 2 nanofluid analysis in a porous medium under mhd radiative boundary layer and dusty fluid
Journal of Molecular Liquids, 2018Co-Authors: S S Ghadikolaei, D D Ganji, Kh Hosseinzadeh, M HatamiAbstract:Abstract In this paper, magnetohydrodynamic (MHD) boundary layer flow and heat transfer of an incompressible Iron (II,III) oxide (Fe3O4)-ethylene glycol ((CH2OH)2) nanoparticle on micropolar fluid with homogeneously suspended dust particles over a stretching sheet in the presence of thermal radiation and Joule heating are investigated. After transforming the partial differential equations (PDEs) governing the problem into the ordinary differential equations (ODEs), Runge–Kutta Fehlberg fourth fifth order numerical method is applied. The main criterion of this paper is to study the effects of different parameters and dimensionless Numbers on velocity and temperature distribution in two phases of fluid and dust for two prescribed surface temperature (PST) and prescribed heat flux (PHF) cases. Velocity reduction in both fluid and dust phases is due to the Lorentz force against flow by increasing Hartman Number, enhancement of temperature and thickness of thermal boundary layer are due to the increase of radiation parameter and Eckert Number for both PST and PHF cases are the most important results. Also, in the final section of this paper, the effect of changes in the value of different parameters on skin friction coefficient and local Nusselt Number in (PST and PHF PHF) have been discussed. These results indicated increasing the Hartman parameter (Ha) would cause an increase skin friction coefficient, also increasing the Eckert Number would cause an increase local Nusselt Number in PST case and reverse effect in PHF case.
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numerical simulation of two phase unsteady nanofluid flow and heat transfer between parallel plates in presence of time dependent magnetic field
Journal of The Taiwan Institute of Chemical Engineers, 2015Co-Authors: M Sheikholeslami, M Hatami, G DomairryAbstract:Abstract In this study, two phase simulation of nanofluid flow and heat transfer between parallel plates is investigated. The important effects of Brownian motion and thermophoresis have been included in the model of nanofluid. The governing equations are solved via homotopy perturbation method. According to comparison with previous works, this method has good accuracy to solve this problem. The semi analytical investigation is carried out for different governing parameters namely; the squeeze Number, Hartmann Number, Schmidt Number and Eckert Number. The results indicate that absolute skin friction coefficient decreases with increase of Hartmann Number and squeeze Number. Also it can be found that that Nusselt Number is an increasing function of Hartmann Number, Eckert Number and Schmidt Number but it is a decreasing function of squeeze Number.
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squeezing cu water nanofluid flow analysis between parallel plates by dtm pade method
Journal of Molecular Liquids, 2014Co-Authors: G Domairry, M HatamiAbstract:Abstract In this paper, Cu–water nanofluid flow analysis between two parallel palates is investigated using a differential transformation method (DTM) and numerical method. The effective thermal conductivity and viscosity of nanofluids are calculated by the Maxwell–Garnetts (MG) and Brinkman models, respectively. For increasing the accuracy of DTM, Pade approximation is applied. Comparison between the DTM-Pade and numerical method shows that Pade with order [6,6] can be an exact and high efficiency procedure for solving these kinds of problems. The influence of the nanofluid volume fraction (φ), Eckert Number (Ec), squeeze Number (S) and Prandtl Number (Pr) on the Nusselt Number (Nu), non-dimensional temperature and velocity profiles are investigated. The results indicated for the case of squeezing flow that the Nusselt Number increases with the increase of the nanoparticle volume fraction, Eckert Number and squeeze Number.
M Sheikholeslami - One of the best experts on this subject based on the ideXlab platform.
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Magnetic field effect on nanofluid flow between two circular cylinders using AGM
'Elsevier BV', 2018Co-Authors: M Sheikholeslami, P. Jalili, D D GanjiAbstract:In this paper, uniform magnetic field impact on nanofluid flow between two circular cylinders is investigated analytically using AGM. Two phase model is applied for nanofluid. Analytical procedures are examined for various active parameters namely aspect ratio, Hartmann Number, Eckert Number, Reynolds Number, thermophoresis and Brownian parameters and Schmidt Number. Results indicate that velocity reduces with augment of Lorentz forces but it rises with augment of Reynolds Number. Temperature gradient enhances with rise of Hartmann Number but it decreases with augment of other parameters. Keywords: Nanofluid, AGM, Rotating cylinders, Brownian motion, Magnetic fiel
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influence of melting surface on mhd nanofluid flow by means of two phase model
Chinese Journal of Physics, 2017Co-Authors: M Sheikholeslami, Houman B RokniAbstract:Abstract In this paper, the effect of melting heat transfer on the nanofluid flow in the presence of Lorentz forces is reported. Two phase model is considered for the nanofluid. The Runge–Kutta method is selected to solve the ODEs, which are obtained from a similarity transformation. The roles of the Reynolds Number, Schmidt Number, Brownian parameter, thermophoresis parameter, Eckert Number and melting parameter are illustrated graphically. The results reveal that the Nusselt Number increases with an increase of the Hartmann Number. The temperature gradient reduces with a rise of the melting parameter and Eckert Number.
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effect of melting heat transfer on nanofluid flow in existence of magnetic field considering buongiorno model
Chinese Journal of Physics, 2017Co-Authors: M Sheikholeslami, Houman B RokniAbstract:Abstract In this article, the Buongiorno model is applied to the investigation of nanofluid flow over a stretching plate in the presence of a magnetic field. Radiation and melting heat transfer are taken into account. The Runge-Kutta method is selected in order to solve the ODEs which are obtained from similarity transformations. The roles of the Brownian motion, thermophoretic parameter, Hartmann Number, porosity parameter, melting parameter and Eckert Number are presented graphically. Our results indicate that the nanofluid velocity and concentration are enhanced with a rise of the melting parameter. The Nusselt Number is reduced with an increase of the porosity and melting parameters.
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Nanofluid heat transfer between two pipes considering Brownian motion using AGM
Elsevier, 2017Co-Authors: M Sheikholeslami, M. Nimafar, D D GanjiAbstract:Nanofluid flow between two circular cylinders is studied in existence of magnetic field. KKL model is applied for nanofluid. Thermal radiation effect has been considered in energy equation. AGM is selected for solving ODEs. Semi analytical procedures are examined for various active parameters namely; aspect ratio, Hartmann Number, Eckert Number and Reynolds Number. Results indicate that temperature gradient enhances with rise of Ha, Ec and η but it reduces with augment of Re. Velocity reduces with rise of Lorentz forces but it augments with rise of Reynolds Number
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magnetic field effect on unsteady nanofluid flow and heat transfer using buongiorno model
Journal of Magnetism and Magnetic Materials, 2016Co-Authors: M Sheikholeslami, D D Ganji, M M RashidiAbstract:Abstract In this study, heat and mass transfer characteristic of unsteady nanofluid flow between parallel plates is investigated. The important effect of Brownian motion and thermophoresis has been included in the model of nanofluid. The governing equations are solved via Differential Transformation Method. The validity of this method was verified by comparison previous work which is done for viscous fluid. The analytical investigation is carried out for different governing parameters namely; the squeeze Number, Hartmann Number, Schmidt Number, Brownian motion parameter, thermophoretic parameter and Eckert Number. The results indicate that skin friction coefficient has direct relationship with Hartmann Number and squeeze Number. Also it can be found that Nusselt Number increases with increase of Hartmann Number, Eckert Number and Schmidt Number but it is decreases with augment of squeeze Number.
