HEAT TRANSFER PHENOMENA IN A MOVING NANOFLUID OVER A HORIZONTAL SURFACE

    Authors

    K. Vajravelu;K. V. Prasad

    Comments

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    Abbreviated Journal Title

    J. Mech.

    Keywords

    Nanofluid; Variable fluid properties; Brownian motion; Viscous; dissipation; Heat transfer; Moving surface; Finite differences; BOUNDARY-LAYER-FLOW; POWER-LAW FLUID; VARIABLE VISCOSITY; STRETCHING; SHEET; FLAT-PLATE; ENCLOSURE; ENHANCEMENT; Mechanics

    Abstract

    A numerical study is carried out to study the effects of variable fluid properties on the boundary layer flow and heat transfer of a nanofluid at a flat sheet. The effects of Brownian motion, thermophoresis and viscous dissipation due to frictional heating are also considered. The temperature-dependent variable fluid properties, namely, the fluid viscosity and the thermal conductivity are assumed to vary, respectively, as an inverse function and a linear function of temperature. Using a similarity transformation, the governing non-linear partial differential equations of the model problem are transformed into coupled non-linear ordinary differential equations and these equations are solved numerically by Keller-Box method. Velocity, temperature, and nanoparticles volume fraction profiles are presented and analyzed for several sets of values of the governing parameters; namely, variable fluid viscosity, variable thermal conductivity, Brownaian motion, thermophoresis and plate-velocity parameters with changes in the Prandtl and Schmidt numbers. it is observed that there is an increase in the skin friction in the upstream movement of the plate: But quite the opposite is true in the downstream movement of the plate. Also, the effect of the Schmidt number and the Brownian motion parameter is to reduce the Sherwood number, where as the effect of thermophoresis parameter is to enhance it.

    Journal Title

    Journal of Mechanics

    Volume

    28

    Issue/Number

    3

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    579

    Last Page

    588

    WOS Identifier

    WOS:000307205900019

    ISSN

    1727-7191

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