We report numerical and experimental studies on a droplet moving through an array of mirofluidic ratchets. Droplets are formed at a T junction and subsequently forced through microfluidic ratchets in the form of diffuser/nozzle structures. At the same flow rates of the continuous and the dispersed phases, the velocity of the droplet is determined by the viscosity of the continuous phase and the...

We numerically study the static structures resulting from the coupled demixing and dewetting of a film of binary liquid on a solid substrate. The model corresponds to the static limit of the diffuse interface model describing the phase separation process for a binary liquid (model-H), when supplemented by boundary conditions at the evolving free surface. The resulting variational problem is dis...

In recent years asymmetric cross section aluminum alloy stock has been finding increasing use in various industrial manufacturing areas such as general structures and automotive components. In these areas, components are generally required to have complex curved configuration and, as such, a bending process is required during manufacture. Undesirable deformation in bending processes such as fla...

A two-step acid/base-catalyzed silica gel has been aged in alcohol and water baths followed by various aprotic solvents with a wide range of surface tensions. Low temperature (CO 2) and high temperature (ethanol) aerogels were also prepared. The physical and chemical structures of gels dried from aprotic solvents were studied by a series of techniques (29Si MAS-NMR, nitrogen adsorption, SAXS, e...

INTRODUCTION Surface tension is an inherently dominant force in the microscale. Electrocapillarity, the modification of surface tension by applying an electric field, has received renewed attention because of its potential usefulness in microfluidics. Pollack et al. demonstrated a microactuator for rapid manipulation of discrete microdroplets by direct electric control of the surface tension. [...

Abstract In this paper, a linear relationship between the frequency of membrane structures and their inner tension stress has been studied. The analytical relationships vibration were obtained, results verified by experiment finite element simulations.

Stress fibers and focal adhesions are complex protein arrays that produce, transmit and sense mechanical tension. Evidence accumulated over many years led to the conclusion that mechanical tension generated within stress fibers contributes to the assembly of both stress fibers themselves and their associated focal adhesions. However, several lines of evidence have recently been presented agains...

The aim of this research is to design a controlling loop that eliminates the irregularities in yarn tension during the winding process. In order to achieve this, we employed a relative feedback industrial control system. The yarn tension sensor measures the tension. Its output is analyzed in the automatic controlling unit. This unit adjusts the tension level according to feedback signals, thus ...