Abstract

ESCOBAR QUIROZ, J. F.; MANSILLA, R. A.; GOMBA, J. M.  and  PERAZZO, C. A.. SIMULACIONES NUMÉRICAS 3D DEL FLUJO DE UNA GOTA BAJO LOS EFECTOS DE UN GRADIENTE RADIAL DE TEMPERATURA. An. AFA [online]. 2024, vol.35, n.1, pp.1-1. ISSN 0327-358X.  http://dx.doi.org/10.31527/analesafa.2024.35.1.1.

It has been shown experimentally that when a drop is deposited at the center of a substrate with an axial temperature gradient (hotter in the center), thermocapillarity effects makes an outward flow to appear so that the drop evolves towards a ring whose radius increases with time. Upon reaching a critical radius, the contact line becomes unstable, showing gentle undulations whose amplitudes grow with time. Using the lubrication approximation and adopting appropriate dimensionless variables, a parameter-free differential equation is obtained that governs this type of thermocapillary flow. Numerical solutions of this equation are presented to study the unstable stage. Experimental results are compared with those obtained from the numerical solutions.

Keywords : thermocapillarity; instability.

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