The non-isothermal spreading of a thin drop on a heated or cooled horizontal substrate

Gavin Dunn

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    Abstract

    We revisit the spreading of a thin drop of incompressible Newtonian fluid on a uniformly heated or cooled smooth planar surface. The dynamics of the moving contact line are modelled by a Tanner Law relating the contact angle to the speed of the contact line. The present work builds on an earlier theoretical investigation by Ehrhard and Davis (JFM, 229,365{388 (1991)) who derived the non-linear partial differential equation governing the evolution of the drop. The (implicit) exact solution to the two-dimensional version of this equation in the limit of quasi-steady motion is obtained. Numerically calculated and asymptotic solutions are presented and compared. In particular, multiple solutions are found for a drop hanging beneath a suffciently cooled substrate. If time permits, some basic models for evaporative spreading will be considered.
    Original languageEnglish
    Publication statusAccepted/In press - 11 May 2005
    EventEdinburgh Mathematical Society Postgraduate Students' Meeting - Edzell, Scotland
    Duration: 10 May 200512 May 2005

    Conference

    ConferenceEdinburgh Mathematical Society Postgraduate Students' Meeting
    CityEdzell, Scotland
    Period10/05/0512/05/05

    Keywords

    • heated or cooled horizontal substrate
    • non-linear partial differential equation

    Cite this

    Dunn, G. (Accepted/In press). The non-isothermal spreading of a thin drop on a heated or cooled horizontal substrate. Paper presented at Edinburgh Mathematical Society Postgraduate Students' Meeting, Edzell, Scotland, .