arXiv subjects

Linfeng Piao

Publications and source records attributed to Linfeng Piao.

2 recordsLinked to original sources

arXiv2025

Interface Fragmentation via Horizontal Vibration: A Pathway to Scalable Monodisperse Emulsification

We present a scalable method for producing monodisperse micro-scale emulsions in a rectangular container holding two stably stratified layers of immiscible liquids by applying horizontal vibration. This setup enables the excitation of a single line of ordered Faraday waves along each end wall when viscous forces dominate interfacial dynamics. Our experiments and theoretical modelling show that the critical non-dimensional acceleration for the breakup of the wave tips in a regular array of droplets scales as $N^{-1/2} \omega^{*3/2}$, where $N$ is the kinematic viscosity ratio and $\omega^{*}$ is the frequency of forcing on the viscous-capillary scale. The droplet diameter can be easily tuned by varying the forcing parameters, and the number of droplets generated per cycle is proportional to the width of the container.

cond-mat.soft↗

arXiv2024

Wall-damped Faraday waves in horizontally oscillating two-layer fluid flows

We study experimentally the onset of Faraday waves near the endwalls of rectangular vessel containing two stably-stratified fluid layers, subject to horizontal oscillations. These subharmonic waves (SWs) are excited, because the horizontal inertial forcing drives a harmonic propagating wave which displaces the interface in the vertical direction at the endwalls. We find that the onset of SWs is regulated by a balance between capillary and viscous forces, where the rate of damping is set by the Stokes layer thickness at the wall rather than the wavelength of the SWs. We model the onset of SWs with a weakly-damped Mathieu equation and find that the dimensional critical acceleration scales as $\nu_m^{1/2} \omega^{3/2}$, where $\nu_m$ is the mean viscosity and $\omega$ is the frequency of forcing, in excellent agreement with the experiment over a wide range of parameters.

physics.flu-dyn↗