Internal mixing within a sessile liquid drop can be significantly enhanced by means of so-called electrowetting-on-dielectric (EWOD), using an alternating electric potential. This is done experimentally by monitoring the coalescence and mixing of dyed liquid drops that are brought together by electrowetting actuation. The process is monitored using high-speed imaging and the extent of mixing wi...

Multiwell plate and pipette systems have revolutionized modern biological analysis; however, they have disadvantages because testing in the submicroliter range is challenging, and increasing the number of samples is expensive. We propose a new microfluidic methodology that delivers the functionality of multiwell plates and pipettes at the nanoliter scale by utilizing drop coalescence and confin...

We study the effect of surfactants on dynamics a drop-interface coalescence using full three-dimensional direct numerical simulations. employ hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and bulk diffusion sorption kinetic effects. validate our predictions against experimental data Blanchette Bigio...

• A mechanistic model for the prediction of flow pattern transitions in two-phase, oil-water dispersed pipe flows was developed. Mechanistic can predict separation both oil-in-water and water-in-oil dispersions. Dispersion is controlled by either drop settling rate or coalescence rate. one-dimensional that predicts during liquid-liquid horizontal pipes The able to capture evolution along four c...

A drop-interaction model devised by the authors. which successfully predicts experimentally observed drop-size distributions in stirred batch vessels. has been used to assess the importance of droplet coalescence and redispersion in hydrocarbon fermentation yields. Calculations. which have been made with both n-alkane and gas-oil fermentations, have been compared with previous calculations base...

We have measured the short-time and long-time elastic responses to compression of various types of surfactant layers adsorbed at oil-water interfaces. We prepared reasonably monodisperse oil-in-water emulsions with the same surfactants and monitored the time evolution of the emulsion droplets' diameter. We used a broad variety of surfactants (cationic, nonionic, and small polymers) and alkanes ...

Water droplets can jump during vapor condensation on solid benzene near its melting point. This phenomenon, which can be viewed as a kind of micro scale steam engine, is studied experimentally and numerically. The latent heat of condensation transferred at the drop three phase contact line melts the substrate during a time proportional to R (the drop radius). The wetting conditions change and a...