Free convection from an isothermal elliptical cylinder in Bingham plastic fluids is studied numerically. This work spans a wide range of aspect ratios of the elliptical cylinder ( 0.1 E 10 ) to delineate the effect of shape on the flowfield close to the heated cylinder. The influence of the relevant parameters, namely, Rayleigh number ( 10 2 R a 10 5 ), Prandtl number ( 10 P r 100 ), and Bingham number ( 0.5 B n 10 7 ), on the momentum and heat transfer characteristics is studied in terms of the yielded/unyielded regions, streamline, isotherm contours, and local Nusselt number for an elliptical cylinder of constant surface area in blunt ( E > 1 ) and slender orientations ( E < 1 ). The Nusselt number shows a positive dependence on the Rayleigh number, and it correlates negatively with Bingham and Prandtl numbers. The blunt orientations ( E < 1 ) enhance heat transfer as compared to that for a circular cylinder (of equal surface area) while slender orientations ( E > 1 ) impede it. Using the present numerical results, predictive correlations have been established in terms of the modified Rayleigh number ( R a * ) and Prandtl number ( P r * ), thereby enabling the prediction of Nusselt number in a new application.


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    Titel :

    Laminar Free Convection in Bingham Plastic Fluids from an Isothermal Elliptic Cylinder


    Beteiligte:
    Patel, S. A. (Autor:in) / Chhabra, R. P. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.2016




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch