Abstract
Liquid bridge (LB) between two surfaces creates adhesive/repulsive forces between the surfaces as per its shape. In the static condition, only capillary forces are present, but during stretching of the LB, the viscous force comes into the picture. Thus, stretching of the LB can be used to quantify the viscosity of small volumes of liquid. In the present study, an experimental setup is designed to stretch a LB formed between a spherical and a flat surface. A liquid drop of about one mm in radius is suspended between two moving surfaces. For stretching the drop, the displacement of one end is controlled by a stepper motor-driven linear actuator. The force from the bridge is measured by the deflection of a cantilever with the help of a fiber-optic displacement sensor. The dimensions of the LB are obtained from the images taken with a high-speed digital camera. Dynamic behavior of the LBs of three different liquids is compared with the help of force–displacement plots. Due to negligible evaporation losses, 1-dodecanethiol shows repeatability in multiple experiments with a wide range of stretch rates. Extensional viscosity is calculated by measuring the radius of cylindrical filament and breakup time. The magnitude of measured viscosities is comparable with the reported standard values.
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