Most studies of the effect of aerosols on cloud radiative properties have considered only changes in the cloud droplet concentration, neglecting changes in the spectral shape of the cloud droplet size distribution. However, it has been shown that that the spectral dispersion of the cloud droplet size distribution (defined as the ratio of the standard deviation to the mean radius of the droplet ...

Inspired by recent experiments using synthetic microswimmers to manipulate droplets, we investigate the low-Reynolds-number locomotion of a model swimmer (a spherical squirmer) encapsulated inside a droplet of a comparable size in another viscous fluid. Meditated solely by hydrodynamic interactions, the encaged swimmer is seen to be able to propel the droplet, and in some situations both remain...

We investigate hitherto-unexplored flow characteristics inside a sessile droplet evaporating on heated hydrophobic and superhydrophobic surfaces and propose the use of evaporation-induced flow as a means to promote efficient "on-the-spot" mixing in microliter-sized droplets. Evaporative cooling at the droplet interface establishes a temperature gradient that induces buoyancy-driven convection i...

Liquid atomization is applied in nanostructure dense coating technology to inject suspended nano-size powder materials into a suspension plasma spray (SPS) torch. This paper presents the effects of the atomization parameters on the nanoparticle processing. A numerical model was developed to simulate the dynamic behaviors of the suspension droplets, the solid nanoparticles or agglomerates, as we...

Internal recirculation in a moving droplet, enforced by the presence of fluid–fluid interfaces, plays an important role in several droplet-based microfluidic devices as it could enhance mixing, heat transfer, and chemical reaction. The effect of slip on droplet circulation is studied for two canonical steady-state problems: two-phase Couette, boundary-driven, and Poiseuille, pressure/body force...

-A stochastic model based on the Boltzmann kinetic equation and employing the comprehensive treatment of the dynamics of binary droplet collisions is suggested to describe the droplet size and spatial distribution in dense spray. The model is valid for highly non-equilibrium impinging sprays in which the inertia of the droplets is very high and dynamic coupling with the gas is low. A Monte Carl...

The trappingandtransport of sootaggregatesbetween a burningsuspendeddroplet and its  ame in a convectionfree (microgravity) environment are discussed. Many researchers have utilized the suspended droplet method for studyingdroplet combustion in microgravitywhere the intent is to create a spherically symmetric burning process. In the ideal case, soot particles are trapped in a spherical shell-l...

Droplet impact on hot surfaces results in either droplet-surface contact or non-contact, i.e., the Leidenfrost state. The droplet is levitated upon its vapor, deteriorating heat transfer. temperature depends thermal properties of surface, which are usually characterized by two parameters: diffusivity and effusivity. In this paper, effects these parameters clarified experimentally varying one in...

The Simultaneous impact of a hollow droplet and continuous dense on liquid film was investigated using the coupled level set volume fluid (CLSVOF) method. Analyses included dynamics heat transfer characteristics in impact. Results showed that interfacial phenomena after incorporates spreading, central jet between droplets, edge sheet, counter inside droplet. pressure gradient is major cause for...

Bubble and droplet motion in binary mixtures is studied in weak heat and diffusion fluxes and in gravity by solving the linearized hydrodynamic equations supplemented with appropriate surface boundary conditions. Without gravity, the velocity field is induced by evaporation and condensation at the interface and by the Marangoni effect due to a surface-tension gradient. In pure fluids, the latte...