NARHE, R; BEYSENS, D; NIKOLAYEV, Vadim

doi:10.1007/s10765-005-8593-4

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NARHE, R
Service des Basses Températures [SBT ]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BEYSENS, D
Physique et mécanique des milieux hétérogènes [PMMH]
Service des Basses Températures [SBT ]

NIKOLAYEV, Vadim
Service de physique de l'état condensé [SPEC - UMR3680]
Service des Basses Températures [SBT ]

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International Journal of Thermophysics. 2005

Springer Verlag

Résumé en anglais

An investigation of the coalescence of two water drops on a surface is presented and compared with drop spreading. The associated capillary numbers are very low (< 10-5). The drops relax exponentially towards equilibrium. The typical relaxation time tc decreases with contact angle. tc is proportional to the drop size R, thus defining a characteristic velocity U* =R/tc. The corresponding U* values are smaller by many orders of magnitude than the bulk hydrodynamic velocity (U = /, with  the gas-liquid surface tension and  the viscosity). The dynamics of receding (coalescence) and spreading motion is found of the same order when coalescence or spreading is induced by a syringe. The dynamics of coalescence induced with the syringe deposition is systematically faster by an order of magnitude than condensation-induced coalescence. This disparity is explained by the coupling of the contact line motion with the oscillation of the drop observed for syringe deposition but absent for condensation-induced coalescence.< Réduire

Mots clés en anglais

capillary

coalescence

contact angle

contact line velocity

wetting

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Dynamics of Drop Coalescence on a Surface: The Role of Initial Conditions and Surface Properties

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