A three-dimensional model has been developed, of droplet impact onto asymmetric surface geometries. The model is based on RIPPLE, and combines a xed-grid control volume discretization of the ow equations with a volume tracking algorithm to track the droplet free surface. Surface tension is modelled as a volume force acting on uid near the free surface. Contact angles are applied as a boundary c...

A Phase Doppler Particle Analyzer (PDPA) system is employed to measure the two-phase mist flow behavior including flow velocity field, droplet size distribution, droplet dynamics, and turbulence characteristics. Based on the droplet measurements made through PDPA, a projected profile describing how the air-mist coolant jet flow spreads and eventually blends into the hot main flow is proposed. T...

[1] This study analyzes 27 cumuliform and stratiform clouds sampled aboard the CIRPAS Twin Otter during the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) experiment. The data set was used to assess cloud droplet closure using (1) a detailed adiabatic cloud parcel model and (2) a state-of-the-art cloud droplet activation parameterization. A uniqu...

Cryogenic sprays are of interest in dermatology for cooling human skin during pulsed laser treatment of port wine stain (PWS) birthmarks. In the present study, a Phase Doppler Interferometer (PDI) was used to obtain preliminary measurements of mean diameters and mean velocities of tetrafluoroethane (HFC-134a) spray droplets, generated by an atomizing nozzle of a commercial dermatological instru...

Paramecium swimming in capillary tube Phys. Fluids 24, 041901 (2012) Orientational order in concentrated suspensions of spherical microswimmers Phys. Fluids 23, 111702 (2011) Microfluidic droplet encapsulation of highly motile single zoospores for phenotypic screening of an antioomycete chemical Biomicrofluidics 5, 044103 (2011) Measuring oscillatory velocity fields due to swimming algae Phys. ...

The influence of aerosols on the atmospheric radiative budget, as seen in the effect of cloud condensation nuclei (CCN) on the optical properties of clouds, for example, is one of the key issues in understanding and predicting global climate change. To study quantitatively the effect of CCN on the optical properties of low-level layer clouds, we developed a cloud microphysical adiabatic parcel ...

Emerging assays in droplet microfluidics require the measurement of parameters such as drop size, velocity, trajectory, shape deformation, fluorescence intensity, and others. While micro particle image velocimetry (μPIV) and related techniques are suitable for measuring flow using tracer particles, no tool exists for tracking droplets at the granularity of a single entity. This paper presents d...