A Novel Droplet Generator and a Bench-Testing Rig Enabling Research on Suspension Droplet Wall Impingement and Particle Deposition

Author:

Vulf MikhailORCID,Petrov Vladimir,Sulimov Artem,Simonova Anastasia,Kazak Andrey,Chugunov SvyatoslavORCID,Kolomenskiy DmitryORCID

Abstract

We present a novel device for generating suspension droplets and studying droplet impact against solid substrates. The proposed droplet generator extends beyond previous designs by introducing hydraulic machinery that includes separate hydraulic and test containers. This eliminates mixing between the test liquid and the hydraulic liquid above the latch that connects the two containers, thus ensuring reliable clogless operation. The device can produce droplets of controllable sizes between 0.75 and 4.4 mm, and droplets can contain suspension particles of 45 μm to 300 μm size. Repeatability tests show that, at constant control parameters, the median relative droplet size deviation from the target value is ±0.9% and the maximum relative deviation is ±9.1%. We also explore different collision scenarios, which we change from spreading to bouncing by varying the substrate wettability. In addition, the shape of the stain and the resulting spatial distribution of particles are found to be sensitive to particle size.

Funder

Russian Science Foundation

the RFBR and the Research Council of Norway

Publisher

MDPI AG

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces

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