high temperatures are often encountered in almost all of the combustion systems, therefore, thermal radiation heat transfer can influence the droplets heat up rate and consequently their life time. in this paper, the effect of thermal radiation heat transfer is investigated for two cases of directional and spherically symmetric illuminations. the flow and temperature fields insdie and outside o...

A transparent model cell for direct ex-situ visualization of the dynamic characteristics growth, deformation and detachment liquid water in flow channel proton exchange membrane fuel (PEMFC) is designed. It fulfills requirements clear side imaging droplet behaviors channel. Different air velocities are implemented experiments to measure growth on gas diffusion layer (GDL) surface. The results s...

To elucidate the characteristics of droplet breakup induced by a shock wave and vortex ring behind shock, experiments were conducted with water various glycerol mixtures under different Mach numbers. High-speed visualization system, pressure testing laser particle analyzer applied to record interaction process between droplets after wave. The results show that two stages are identified, includi...

As a droplet moves, due to evaporation at the surface, the droplet size is gradually reduced. Due to decreasing the size of the droplets moving in the spray core, the surface charges become closer and the repulsive force between the charges increases. When the Coulombic force overcomes the surface tension force (Rayleigh instability) the droplet breaks into smaller droplets (Coulomb fission). T...

Abstract In this paper, the morphological characteristics and breakup time of droplet under action shock wave were investigated experimentally. Morphological captured by high-speed photography. By varying diameter droplets taking influence Mach number into consideration, eight tests performed in experiments. The experimental results showed that wave, underwent two different stages: deformation ...

a modified model has been analytically developed to describe the induction time of an elliptic air bubble in contact with an elliptic hydrophobic oil droplet. the role of hydrophobicity was revealed in the slippage of liquid over the surfaces of bubble and droplet. in this condition, the analytical relationships for pressure distribution and consequently hydrodynamic resistance force through th...

We calculate the deformation of a spherical droplet, resulting from the application of a pair of opposite forces to particles located diametrically opposite at the two ends of the droplet. The free-energy analysis is used to calculate the force-distance curves for the generated restoring forces, arising from the displacement of the particles relative to each other. While the logarithmic depende...

In the absence of coalescence, coarsening of emulsions (and foams) is controlled by molecular diffusion of the dispersed phase species from one emulsion droplet (or foam bubble) to another. Previous studies of dilute emulsions have shown how the osmotic pressure of a trapped species within droplets can overcome the Laplace pressure differences that drive coarsening, and " osmotically stabilise ...