Breakup mechanism of the electrically induced conical liquid bridge

Abstract

The breakup mechanism of a conical liquid bridge, based on the previously proposed electrostatic liquid loading method, is reported for the first time. The breakup criterion in terms of interface feature size is derived. Based on the criterion, the breakup mechanism can be categorized as either spontaneous breakup or stretching breakup. The evolution of interface and velocity for two breakup behaviors is subsequently investigated. For spontaneous breakup, the remnant volume Vd depends primarily on the top radius Rt and is proportional to the square of Rt. For stretching breakup, the remnant volume depends on the early stage of the stretching and Vd is proportional to the cube of Rt. In addition, the influence of stretching velocity U is examined. Results show that U has a weaker effect on the change of remnant volume than the top radius Rt for large capillary numbers. This study is helpful in understanding the liquid bridge breakup mechanism and improving the transfer printing process.

Polarization Effect and Improvement of the Electroinduced Formation Efficiency of a Highly Viscous Liquid Bridge

“…25 The dipole is assumed to be an ellipsoid with axis length l i = {a, b, c} and rotates about the c-axis to θ = 0, where θ is the angle between the electric field and the a-axis, as shown in Figure 4c. Two characteristic parameters of the ellipsoidal dipole are given by the elliptic integrals (4) (5) The polarization intensity of the ellipsoidal dipole can be expressed as (6) where ε p and ε m are the dielectric constants of the particles and medium, E i is the component of electric field strength, and the denominator is replaced with k i in order to simplify the formula.…”

“…We previously suggested a method for dispensing highly viscous adhesive (298 Pa·s) based on electro-hydrodynamics (EHD). , EHD constitutes an interdisciplinary science encompassing branches such as hydrodynamics, electrostatics, electrochemistry, and thermophysics . It has been applied in various fields such as micropatterning, , microprinting, , etc.…”

A Compact Parallel Dispensing Machine of High-viscous Adhesive Based on Electrostatic-induced Mechanism

“…More recently, we had solved a series of problems such as the shape-controlling of liquid bridge [22] and the formation accelerating of stable liquid bridges, making it more practical [23].…”

Stretching breakup of a conical liquid bridge with a moving contact line

“…For hydrophilic liquids, the wettability difference between the bridge ends is small and the bridge top is usually pinned during stretching. 7 And for less hydrophilic liquids, the top contact line tends to de-pin and the moving contact line must be considered.…”