The contact angle in inviscid fluid mechanics

Details The contact angle in inviscid fluid mechanics The contact angle in inviscid fluid mechanics

2005-08-17

arxiv.org/abs/math-ph/0508036v1

Proc. Indian Acad. Sci. (Math. Sci.), Vol. 115, No. 2, May 2005, pp. 227-240

Physics

Mathematical Physics

13 pages, no figures, no tables

Scientific paper

We show that in general, the specification of a contact angle condition at the contact line in inviscid fluid motions is incompatible with the classical field equations and boundary conditions generally applicable to them. The limited conditions under which such a specification is permissible are derived; however, these include cases where the static meniscus is not flat. In view of this situation, the status of the many `solutions' in the literature which prescribe a contact angle in potential flows comes into question. We suggest that these solutions which attempt to incorporate a phenomenological, but incompatible, condition are in some, imprecise sense `weak-type solutions'; they satisfy or are likely to satisfy, at least in the limit, the governing equations and boundary conditions everywhere except in the neighbourhood of the contact line. We discuss the implications of the result for the analysis of inviscid flows with free surfaces.

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