Rupture of an Evaporating Liquid Bridge between Two GrainsReport as inadecuate

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1 IRSN - Institut de Radioprotection et de Sûreté Nucléaire 2 MIST - Laboratoire de micromécanique et intégrité des structures 3 LMGC - Laboratoire de Mécanique et Génie Civil 4 SIGECO - Structures Innovantes, Géomatériaux, ECOconstruction LMGC - Laboratoire de Mécanique et Génie Civil 5 Servex - Moyens expérimentaux LMGC - Laboratoire de Mécanique et Génie Civil 6 Duke university Durham

Abstract : The study examines rupture of evaporating liquid bridges between two glass spheres. Evolution of the bridge profile has been recorded with the use of high-speed camera. Geometrical characteristics of the bridge were then used to calculate evolution of the variables during the process: Laplace pressure, capillary force, and surface tension force. For the purpose of reference, the bridge evolution is followed also during kinematic extension. During both processes the diameter of the neck decreases, with an acceleration of about 1–2 ms before the rupture. Two distinct rupture modes are observed, depending on the bridge aspect ratio. After the rupture, the mass of liquid splits, forming two separate oscillating drops attached to the spheres, and a suspended satellite droplet. Just before the rupture, an increasing repulsive Laplace pressure, and decreasing negative surface tension force develop. Capillary force follows the trend of the surface tension force, with an accelerating decline. Duration of the whole process and liquid mass stabilization is from 10 to 60 ms.

Keywords : evaporation capillary bridge rupture capillary force

Author: Boleslaw Mielniczuk - Moulay Saïd El Youssoufi - Laurent Sabatier - Tomasz Hueckel -



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