Dynamics of two-dimensional liquid bridges

Abstract

We have simulated the motion of a single vertical, two-dimensional liquid bridge spanning the gap between two flat, horizontal solid substrates of given wettabilities, using a multicomponent pseudopotential lattice Boltzmann method. For this simple geometry, the Young–Laplace equation can be solved (quasi-)analytically to yield the equilibrium bridge shape under gravity, which provides a check on the validity of the numerical method. In steady-state conditions, we calculate the drag force exerted by the moving bridge on the confining substrates as a function of its velocity, for different contact angles and Bond numbers. We also study how the bridge deforms as it moves, as parametrized by the changes in the advancing and receding contact angles at the substrates relative to their equilibrium values. Finally, starting from a bridge within the range of contact angles and Bond numbers in which it can exist at equilibrium, we investigate how fast it must move in order to break up.

Relationship between Disintegration Characteristics and Intergranular Suction in Red Soil

“…Therefore, an increasing number of scholars have directed their research to the relationship between soil particles and proposed the concept of suction, which can reflect the real action of soil particles. Lian et al (1993) attributed the interaction between particles to the liquid bridge between the particles and termed this force the liquid bridge stress [125,126]. Shen (1996) highlighted that all the factors that increase the sliding resistance between the grains correspond to the generalised suction principle and extended the generalised effective stress principle based on the effective stress principle of saturated soil [127].…”