We present a droplet microfluidic method to extract molecules of interest from a droplet in a rapid and continuous fashion. We accomplish this by first marginalizing functionalized super-paramagnetic beads within the droplet using a magnetic field, and then splitting the droplet into one droplet containing the majority of magnetic beads and one droplet containing the minority fraction. We quant...

We study the mathematical evolution of a liquid fuel droplet inside a vessel. In particular, we analyze the evolution of the droplet radius on a finite time interval. The model problem involves an hyperbolic system coupled with the pressure and velocity of the surrounding gas. Existence of bounded solutions for the mass fraction of the liquid, submitted to nonlinear constraints, is shown. Numer...

A stochastic droplet collision model (Sommerfeld [9]), based on the creation of a fictitious collision partner is described, taking into account impact efficiencies. The model of O’Rourke [5] is considered to predict the outcome of water-droplet collisions, being grazing or coalescing, and to predict post-collision velocities. The relevance of impact efficiencies is discussed for water droplet ...

Electrowetting (EW) involves the actuation of liquid droplets using electric fields and has been demonstrated as a powerful tool for initiating and controlling droplet-based microfluidic operations such as droplet transport, generation, splitting, merging and mixing. The heat transfer resulting from EW-induced droplet actuation has, however, remained largely unexplored owing to several challeng...

The formation and dynamics of Pt-Si liquid droplets on Si ~001! surfaces are explored with real-time ultraviolet photoelectron emission microscopy. PtSi islands of micrometer lateral diameter begin to melt and are transformed into molten Pt-Si alloy islands below the melting point of bulk PtSi. In particular, at ;1100 °C surface migration of the liquid microdroplets is observed, where the dropl...

Electrowetting (EW) involves the actuation of liquid droplets using electric fields and has been demonstrated as a powerful tool for initiating and controlling droplet-based microfluidic operations such as droplet transport, generation, splitting, merging and mixing. The heat transfer resulting from EWinduced droplet actuation has, however, remained largely unexplored owing to several challenge...

We develop a model to describe the dynamics of a spreading and melting droplet on a heated substrate. The model, developed in the capillary-dominated limit, is geometrical in nature and couples the contact line, trijunction, and phase-change dynamics. The competition between spreading and melting is characterized by a single parameter KT that represents the ratio of the characteristic contact l...

The statistical behavior of droplets in a kerosene pressure-atomized spray was investigated under swirling and burning conditions. This case was studied in order to better understand individual droplet transport processes downstream of the fuel spray flame. A two-component phase-Doppler particle sizing system was employed to provide information on the droplet size and velocity distributions as ...

The crater formation due to the impact of a water droplet onto a granular bed has been experimentally investigated. Three parameters were tuned: the impact velocity, the size of the droplet, and the size of the grains. The aim is to determine the influence of the kinetic energy on the droplet pattern. The shape of the crater depends on the kinetic energy at the moment the droplet starts to impa...