A theoretical solution is presented for the convective heat transfer of Giesekus viscoelastic fluid in pipes and channels, under fully developed thermal and hydrodynamic flow conditions, for an imposed constant heat flux at the wall. The fluid properties are taken as constant and axial conduction is negligible. The effect of We (Weissenberg number), a (mobility parameter) and Br (Brinkman number) on the temperature profile and Nusselt number are investigated. The results emphasise the significant effect of viscous dissipation and fluid elasticity on the Nusselt number in all circumstances. For wall cooling and the Brinkman number exceeding a critical value (Br1), the heat generated by viscous dissipation overcomes the heat removed at the wall and fluid heats up longitudinally. Fluid elasticity shifts this critical Brinkman number to higher values.


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    Title :

    Forced convection heat transfer of Giesekus viscoelastic fluid in pipes and channels


    Contributors:

    Published in:

    Heat and Mass Transfer ; 46 , 4 ; 405-412


    Publication date :

    2010


    Size :

    8 Seiten, 8 Bilder, 18 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English