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Two-dimensional analogies to the deformation characteristics of a falling droplet and its collision

Rafi Abid Hasan, Haque Mohammad Rejaul, Ahmed Dewan Hasan

Archive of Mechanical Engineering

2022

LXIX, nr 1

21--43

The present study investigates the 2D numerical analogies to the changes of the droplet shapes during the freefall for a wide range of droplet sizes through the stagnation air. The freefall velocity, shape change due to frictional force during free-fall is studied for different considered cases. With the elapse of time, a droplet with a larger initial diameter is changing its original shape more compared to droplets with a smaller diameter. In addition, the spreading of the droplet during the freefall seems more rapid for the larger-diameter droplet. When a droplet with an initial diameter of 15 mm starts to fall with gravitational force, the diameter ratio is decreasing for droplets with higher density and surface tension while droplets having lower density and surface tension show a diameter ratio greater than one. The spreading and splashing of the droplet on a solid surface and liquid storage at the time of impact are much influenced by the freefall memories of the droplet during the freefall from a certain height. These freefall memories are influenced by the fluid properties, drag force, and the freefall height. However, these freefall memories eventually regulate the deformation of the droplet during the freefall.

Investigations of modular microfluidic geometries for passive manipulations on droplets

Zaremba D., Blonski S., Jachimek M., Marijnissen M. J., Jakiela S., Korczyk P. M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 2

139--149

Multiple pipetting is a standard laboratory procedure resulting in the compartmentalisation of a liquid sample. Microfluidics offers techniques which can replace this process by the use of tiny droplets. Passive manipulation on droplets is an interesting and promising approach for the design of microfluidic devices which on one hand are easy-to-use and on the other, execute complex laboratory procedures. We present a comprehensive study of the geometry of microfluidic components which encode different operations on droplets into the structure of the device. The understanding of hydrodynamic interactions between the continuous flow and a droplet travelling through confined space of nontrivial microfluidic geometries is crucial for a rational and efficient design of new generation of modular microfluidic processors with embedded instructions.

Droplet Impact in Icing Conditions – Experimental Study for WE 540

Lizer T., Remer M., Sobieraj G., Psarski M., Pawlak D., Celichowski G.

Archive of Mechanical Engineering

2017

Vol. LXIV, nr 2

165--175

The work presents investigation on the water droplet impingement at a substrate with three different surface coating. The experiments are carried out for two temperatures of the surface: 23 degrees centigrade (room temperature) and 10 degrees centigrade. The water droplet contact is recorded via ultra-fast camera and simultaneously via fast thermographic camera. The wetting properties are changing for subzero temperatures of substrates.