The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform

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

  • nonlinear thermal radiation in three Dimensional Flow of jeffrey nanofluid
    Applied Mathematics and Computation, 2014
    Co-Authors: S A Shehzad, Tasawar Hayat, Ahmed Alsaedi, Mustafa Ali Obid
    Abstract:

    Three-Dimensional Flow of Jeffrey fluid is modeled.Radiative Flow is taken into account.Thermophoresis and Brownian motion effects are incorporated.Series solutions are developed to analyze the results.Values of local Nusselt and Sherwood numbers are computed and discussed. This article explores the characteristics of thermophoresis and Brownian motion in magnetohydrodynamic three-Dimensional Flow of nano Jeffrey fluid. Flow analysis is modeled in the presence of thermal radiation. The resulting stretched Flow problems have been solved for the velocity, temperature and concentration. The constructed expressions depend upon ratio of relaxation to retardation times, Deborah number, magnetic parameter, ratio of stretching rates, Lewis number, Prandtl number, radiation parameter, thermophoresis and Brownian motion parameters. Plots are presented and analyzed specifically for the temperature and nanoparticle concentration profiles. Numerical computations are performed for local Nusselt and Sherwood numbers. Impact reflecting the contributions of various embedded on the local Nusselt and Sherwood numbers is point out. It is observed that temperature and nanoparticle concentration profiles are decreased with an increase in Deborah number. An increase in thermophoresis parameter shows rise to the temperature and nanoparticle concentration fields. It is also seen that temperature and nanoparticle concentration profiles are quite opposite when Brownian motion parameter is increased.

  • Newtonian heating effects in three-Dimensional Flow of viscoelastic fluid
    Chinese Physics B, 2014
    Co-Authors: Abdul Qayyum, Tasawar Hayat, Mohammed S. Alhuthali, Honaida Malaikah
    Abstract:

    A mathematical model is constructed to investigate the three-Dimensional Flow of a non-Newtonian fluid. An incompressible viscoelastic fluid is used in mathematical formulation. The conjugate convective process (in which heat the transfer rate from the bounding surface with a finite capacity is proportional to the local surface temperature) in three-Dimensional Flow of a differential type of non-Newtonian fluid is analyzed for the first time. Series solutions for the nonlinear differential system are computed. Plots are presented for the description of emerging parameters entering into the problem. It is observed that the conjugate heating phenomenon causes an appreciable increase in the temperature at the stretching wall.

  • mhd three Dimensional Flow of jeffrey fluid with newtonian heating
    Journal of Central South University, 2014
    Co-Authors: S A Shehzad, Tasawar Hayat, Mohammed S. Alhuthali, S Asghar
    Abstract:

    The magnetohydrodynamic (MHD) three-Dimensional Flow of Jeffrey fluid in the presence of Newtonian heating is investigated. Flow is caused by a bidirectional stretching surface. Series solutions are constructed for the velocity and temperature fields. Convergence of series solutions is ensured graphically and numerically. The variations of key parameters on the physical quantities are shown and discussed in detail. Constructed series solutions are compared with the existing solutions in the limiting case and an excellent agreement is noticed. Nusselt numbers are computed with and without magnetic fields. It is observed that the Nusselt number decreases in the presence of magnetic field.

  • three Dimensional Flow of jeffery fluid with convective surface boundary conditions
    International Journal of Heat and Mass Transfer, 2012
    Co-Authors: S A Shehzad, Tasawar Hayat, A. Alsaedi
    Abstract:

    Abstract Three-Dimensional Flow of Jeffery fluid over a stretched surface with convective boundary condition is examined in this article. The equations governing this Flow are modeled. The series solutions of nonlinear equations are constructed. Results for velocity and temperature are analyzed. Further, numerical values of Nusselt number are computed and discussed. The present analysis in a limiting sense is compared with the previous results. An excellent agreement is noted.

  • Study on three-Dimensional Flow of Maxwell fluid over a stretching surface with convective boundary conditions
    International Journal of the Physical Sciences, 2012
    Co-Authors: Tasawar Hayat, S A Shehzad, A. Alsaedi
    Abstract:

    Three-Dimensional Flow of non-Newtonian fluid induced by a stretching surface has been studied. The constitutive equations of Maxwell fluid are used. The surface possesses convective boundary conditions. Computations have been carried out for the non-linear problem. Convergence of the obtained solutions is discussed. Impact of the influential parameters involved in the heat transfer analysis is emphasized. Comparison with the previous results is shown. It is found that effects of Deborah and Biot parameters on the Nusselt number are opposite. The Prandtl and Biot numbers have qualitative similar impact on the Nusselt number.   Key words: Maxwell fluid, convective boundary condition, stretched surface, three-Dimensional Flow.

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

  • three Dimensional Flow over a stretching surface in a viscoelastic fluid
    Nonlinear Analysis-real World Applications, 2008
    Co-Authors: Tasawar Hayat, Muhammad Sajid, Ioan Pop
    Abstract:

    This article looks at the hydrodynamic elastico-viscous fluid over a stretching surface. The equations governing the Flow are reduced to ordinary differential equations, which are analytically solved by applying an efficient technique namely the homotopy analysis method (HAM). The solutions for the velocity components are computed. The numerical values of wall skin friction coefficients are also tabulated. The present HAM solution is compared with the known exact solution for the two-Dimensional Flow and an excellent agreement is found.

Muhammad Sajid - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Flow over a stretching surface in a viscoelastic fluid
    Nonlinear Analysis-real World Applications, 2008
    Co-Authors: Tasawar Hayat, Muhammad Sajid, Ioan Pop
    Abstract:

    This article looks at the hydrodynamic elastico-viscous fluid over a stretching surface. The equations governing the Flow are reduced to ordinary differential equations, which are analytically solved by applying an efficient technique namely the homotopy analysis method (HAM). The solutions for the velocity components are computed. The numerical values of wall skin friction coefficients are also tabulated. The present HAM solution is compared with the known exact solution for the two-Dimensional Flow and an excellent agreement is found.

Nicholas T. Ouellette - One of the best experts on this subject based on the ideXlab platform.

  • Spatial structure of spectral transport in two-Dimensional Flow
    Journal of Fluid Mechanics, 2013
    Co-Authors: Yang Liao, Nicholas T. Ouellette
    Abstract:

    AbstractUsing filter-space techniques (FSTs), we study the spatial structure of the scale-to-scale flux of energy in two-Dimensional Flow. Analysing data from a weakly turbulent, experimental quasi-two-Dimensional Flow, we find rotationally symmetric patterns consisting of lobes of spectral flux of alternating sign that are associated with vortical motion in the Flow field. Such patterns also occur in a simple analytical model, even though the single-scale model Flow should have no scale-to-scale energy transfer. Thus, the interpretation of these alternating patterns must be handled with care. By decomposing the spectral flux into three distinct components, we show that these lobe patterns are entirely associated with the Leonard and, to a lesser extent, cross terms. In addition, we show that the contributions from these two terms are localized around the energy injection scale, and that the bulk of the inverse energy transfer in our Flow is carried by the subgrid term alone.

  • mechanisms driving shape distortion in two Dimensional Flow
    EPL, 2011
    Co-Authors: A De Chaumont Quitry, Douglas H Kelley, Nicholas T. Ouellette
    Abstract:

    In order to elucidate the physical processes governing the evolution of material areas in complex Flow, we study the shape dynamics of three-point Lagrangian clusters in an experimental quasi–two-Dimensional Flow. By comparing our measurements with simulations of triangles evolving purely diffusively, we show that the path taken by the mean triangle shape through a suitably defined phase space is indicative of the underlying Flow dynamics. We demonstrate the existence of organizing curves in shape space for the evolution of triangles with different initial shapes. Our results suggest a detailed, multi-step process governing the shape dynamics of clusters in complex Flow.

James Wadsley - One of the best experts on this subject based on the ideXlab platform.

  • Suppression of three-Dimensional Flow instabilities in tube bundles
    Journal of Fluids and Structures, 2005
    Co-Authors: Nicholas K.-r. Kevlahan, James Wadsley
    Abstract:

    Abstract We study the generation of three-Dimensional vorticity in tightly packed tube bundles. In particular, our goal is to investigate which conditions (if any) enable the Flow to remain two-Dimensional for Re > 180 . We calculated two- and three-Dimensional Flow through periodic rotated square tube bundles with tight packing, P / D = 1.5 , using a high resolution pseudo-spectral code with penalization. The tubes are cylinders whose response is modelled as a rigid harmonic oscillator forced by the Flow-induced lift. We find that at Re = 200 tube motion completely suppresses the three-Dimensional instability. At Re = 1000 tube motion does not suppress the three-Dimensional instability, although the Flow does have increased spanwise correlation and the Strouhal number for the two- and three-Dimensional Flows is approximately the same. The tight packing alone does not suppress the three-Dimensional instability. Three-Dimensional vorticity drastically reduces fluid forces acting on the tube compared with an equivalent two-Dimensional Flow.