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Tasawar Hayat - One of the best experts on this subject based on the ideXlab platform.

  • entropy optimization in flow of williamson nanofluid in the presence of chemical reaction and joule heating
    International Journal of Heat and Mass Transfer, 2019
    Co-Authors: Ijaz M Khan, Sumaira Qayyum, Tasawar Hayat, A Alsaedi
    Abstract:

    Abstract Flow of Williamson nanofluid over a stretching sheet is addressed. Entropy generation is modeled by second thermodynamics law. Present model examines the momentum, heat, mass and entropy generation. Joule heating, viscous dissipation and chemical reaction are considered in the modeling. Fluid is conducting electrically through applied Magnetic field. Optimal homotopy analysis method is implemented for the solutions. Series solutions convergence by residual errors is ensured. Outcomes of Magnetic Parameter. Prandtl number, Brownian motion, chemical reaction Parameter, thermophoresis and Brinkman number are examined. Moreover coefficient of skin friction and heat transfer rate (Nusselt number) are computed and examined. Heat transfer rate by Brownian Parameter is increased. Furthermore entropy generation rate increases for higher Magnetic Parameter.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

  • numerical simulation for nonlinear radiative flow by convective cylinder
    Results in physics, 2016
    Co-Authors: Tasawar Hayat, Muhammad Ijaz Khan, Muhammad Tamoor, A Alsaedi
    Abstract:

    Abstract Present study explores the effect of nonlinear thermal radiation and Magnetic field in boundary layer flow of viscous fluid due to nonlinear stretching cylinder. An incompressible fluid occupies the porous medium. Nonlinear differential systems are obtained after invoking appropriate transformations. The problems in hand are solved numerically. Effects of flow controlling Parameters on velocity, temperature, local skin friction coefficient and local Nusselt numbers are discussed. It is found that the dimensionless velocity decreases and temperature increases when Magnetic Parameter is enhanced. Temperature profile is also increasing function of thermal radiation.

  • interaction of Magnetic field in flow of maxwell nanofluid with convective effect
    Journal of Magnetism and Magnetic Materials, 2015
    Co-Authors: Tasawar Hayat, Taseer Muhammad, S A Shehzad, G Q Chen, Ibrahim A Abbas
    Abstract:

    Abstract Magnetohydrodynamic (MHD) three-dimensional flow of Maxwell nanofluid subject to the convective boundary condition is investigated. The flow is generated by a bidirectional stretching surface. Thermophoresis and Brownian motion effects are present. Fluid is electrically conducted in the presence of a constant applied Magnetic field. Unlike the previous cases even in the absence of nanoparticles, the correct formulation for the flow of Maxwell fluid in the presence of a Magnetic field is established. Newly proposed boundary condition with the zero nanoparticles mass flux at the boundary is employed. The governing nonlinear boundary layer equations through appropriate transformations are reduced in the nonlinear ordinary differential system. The resulting nonlinear system has been solved for the velocities, temperature and nanoparticles concentration distributions. Convergence of the constructed solutions is verified. Effects of emerging Parameters on the temperature and nanoparticles concentration are plotted and discussed. Numerical values of local Nusselt number are computed and analyzed. It is observed that the effects of Magnetic Parameter and the Biot number on the temperature and nanoparticles concentration are quite similar. Both the temperature and nanoparticles concentration are enhanced for the increasing value of Magnetic Parameter and Biot number.

Ahmed Alsaedi - One of the best experts on this subject based on the ideXlab platform.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

  • marangoni mixed convection flow with joule heating and nonlinear radiation
    AIP Advances, 2015
    Co-Authors: Tasawar Hayat, Uzma Shaheen, Anum Shafiq, Ahmed Alsaedi, S Asghar
    Abstract:

    Marangoni mixed convective flow of Casson fluid in a thermally stratified medium is addressed. Flow analysis has been carried out in presence of inclined Magnetic field. Heat transfer analysis is discussed in the presence of viscous dissipation, Joule heating and nonlinear thermal radiation. The governing nonlinear partial differential equations are first converted into ordinary differential systems and then developed the convergent series solutions. Flow pattern with the influence of pertinent Parameters namely the Magnetic Parameter, Casson fluid Parameter, temperature ratio Parameter, stratification Parameter, Prandtl number, Eckert number and radiation Parameter is investigated. Expression of local Nusselt number is computed and analyzed. It is found that the Nusselt number decreases by increasing Magnetic Parameter, temperature ratio Parameter, angle of inclination and stratification Parameter. Moreover the effect of buoyancy Parameter on the velocity distribution is opposite in both the opposing and assisting flow phenomena. Thermal field and associated layer thickness are enhanced for larger radiation Parameter.

Salman Ahmad - One of the best experts on this subject based on the ideXlab platform.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

  • entropy generation optimization and unsteady squeezing flow of viscous fluid with five different shapes of nanoparticles
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018
    Co-Authors: Salman Ahmad, Muhammad Imran Khan, Tasawar Hayat, Muhammad Ijaz Khan, Ahmed Alsaedi
    Abstract:

    Abstract The main objective of this article is to analyze the comparative study of five water base nanofluids. Nanofluids are comprised of titanium oxide or titania (TiO2), aluminum oxide or alumina (AL2O3), copper oxide (CuO), copper (Cu) and silver (Ag) and water (H2O). Unsteady flow between two sheets is analyzed. Upper sheet is squeezed towards lower one while lower stretching sheet exhibits porous character. Thermal radiation, applied Magnetic field, viscous dissipation and Joule heating effects are accounted. Entropy generation is also evaluated. Second law of thermodynamics is implemented for the entropy generation. Partial differential equations are transformed into ordinary differential equations by transformation procedure. Ordinary differential equations system is numerically solved by NDSolve technique. Influences of flow Parameters on velocity, temperature, entropy generation and Bejan number are examined in graphs. Numerical results for skin friction and Nusselt number are tabulated. The obtained results show that velocity decays for larger values of Magnetic Parameter and porosity while it is enhanced through squeezing Parameter. Temperature is an increasing function of Eckert number, Magnetic Parameter, squeezing Parameter and nanoparticles volume fraction. Entropy generation is increased with thermal radiation, Prandtl number, volume fraction and Eckert number.

Swati Mukhopadhyay - One of the best experts on this subject based on the ideXlab platform.

  • mhd boundary layer flow and heat transfer over an exponentially stretching sheet embedded in a thermally stratified medium
    alexandria engineering journal, 2013
    Co-Authors: Swati Mukhopadhyay
    Abstract:

    Abstract MHD boundary layer flow and heat transfer towards an exponentially stretching sheet embedded in a thermally stratified medium subject to suction are presented in this analysis. Suitable transformations are used to convert the partial differential equations corresponding to the momentum and energy equations into highly nonlinear ordinary differential equations. Numerical solutions of these equations are obtained by shooting method. It is found that the heat transfer rate at the surface increases in presence of thermal stratification. Fluid velocity decreases with increasing Magnetic Parameter.

  • slip effects on mhd boundary layer flow over an exponentially stretching sheet with suction blowing and thermal radiation
    Ain Shams Engineering Journal, 2013
    Co-Authors: Swati Mukhopadhyay
    Abstract:

    Abstract The boundary layer flow and heat transfer towards a porous exponential stretching sheet in presence of a Magnetic field is presented in this analysis. Velocity slip and thermal slip are considered instead of no-slip conditions at the boundary. Thermal radiation term is incorporated in the temperature equation. Similarity transformations are used to convert the partial differential equations corresponding to the momentum and energy equations into non-linear ordinary differential equations. Numerical solutions of these equations are obtained by shooting method. It is found that the horizontal velocity decreases with increasing slip Parameter as well as with the increasing Magnetic Parameter. Temperature increases with the increasing values of Magnetic Parameter. Temperature is found to decrease with an increase of thermal slip Parameter. Thermal radiation enhances the effective thermal diffusivity and the temperature rises.

Ioan Pop - One of the best experts on this subject based on the ideXlab platform.

  • effects of Magnetic field and thermal radiation on stagnation flow and heat transfer of nanofluid over a shrinking surface
    International Communications in Heat and Mass Transfer, 2014
    Co-Authors: Samir Kumar Nandy, Ioan Pop
    Abstract:

    Abstract In this paper, the problem of steady two-dimensional magnetohydrodynamic (MHD) stagnation-point flow and heat transfer, with thermal radiation, of a nanofluid past a shrinking sheet is investigated numerically. Both the effects of Brownian motion and thermophoresis are considered simultaneously. A similarity transformation is used to transform the governing partial differential equations to a system of nonlinear ordinary differential equations which are solved numerically using a shooting technique. A similarity solution is presented which depends on the Magnetic Parameter (M), radiation Parameter (R), Brownian motion number (Nb), thermophoresis number (Nt), Prandtl number (Pr), Lewis number (Le) and the ratio of the rate constants of the shrinking velocity to the free stream velocity (α). Interesting solution behavior is observed with multiple solution branches for certain Parameter domain. The results of the present paper show that the velocity, temperature, the wall shear stress, the Nusselt number and the Sherwood number are strongly influenced by the Magnetic Parameter. A comparative study between the previously published results and the present results for a special case is found to be in good agreement.

  • An MHD stagnation slip flow on a moving plate
    Fluid Dynamics Research, 2010
    Co-Authors: Fadzilah Md Ali, Roslinda Mohd. Nazar, Norihan Md. Arifin, Ioan Pop
    Abstract:

    In this paper, the problem of a steady laminar boundary layer flow of a an electrically conducting fluid in the presence of a Magnetic field near the stagnation point with slip on a moving plate is studied. The transformed boundary layer equations are solved numerically using the shooting method. Numerical results are obtained for various values of the Magnetic Parameter M and the slip factor λ. The skin friction coefficients and the velocity profiles f'(η), g(η) and h(η) for various values of M and λ are obtained and discussed.

  • Magnetohydrodynamic flow over a moving plate in a parallel stream with an induced Magnetic field
    International Journal of Minerals Metallurgy and Materials, 2010
    Co-Authors: Khamisah Jafar, Roslinda Nazar, Anuar Ishak, Ioan Pop
    Abstract:

    A viscous boundary layer flow of an electrically-conducting fluid over a moving flat plate in a parallel stream with a constant Magnetic field applied outside the boundary layer parallel to the plate was investigated. The governing system of partial differential equations was transformed to ordinary differential equations using a similarity transformation. The similarity equations were then solved numerically using a finite-difference scheme known as the Keller-box method. Numerical results of the skin friction coefficient, velocity profiles, and the induced Magnetic field profiles were obtained for some values of the moving Parameter, Magnetic Parameter, and reciprocal Magnetic Prandtl number. The results indicate that dual solutions exist when the plate and the fluid move in the opposite directions up to a critical value of the moving Parameter, whose value depends on the value of the Magnetic Parameter.