Abstract

LOPEZ-VILLA, A; PEREZ-TERRAZO, A; GUTIERREZ, G.J.  and  VARGAS, C.A.. Formas de equilibrio de gotas que emergen lentamente de cilindros de pared gruesa. Rev. mex. fis. [online]. 2011, vol.57, n.4, pp.330-337. ISSN 0035-001X.

The equilibrium shapes of the drops that emerge slowly outside of vertical, thick-walled tubes were calculated. For low flow rates it is possible to calculate the shape of drops by using the balance equation between the hydrostatic and the capillary pressure. Asymptotic solutions of the balance equation were found in terms the drop shapes just before of their rupture. Other equilibrium shapes are also calculated through the numerical solution ofthe Young-Laplace equation. The qualitative agreement between experiments and theoretical results validate this work. As a result, it is found that the sizes and shapes of drops depend on the Bond number, the injection pressure and the value of the contact angle.

Keywords : Drops; capillary effects; interaction with surfaces.

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