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Collision and merging of two equal droplets of propanol

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Abstract

Equally spaced and uniform droplets are produced by a vibrating orifice and move away in a straight line. They intersect with an exactly equal string of droplets and collide one by one. With stroboscopic lighting and multiple exposures, they are photographed. Thus successive stages of the collision process are shown on a single photo. The droplets can be made to collide with or without angular momentum by adjusting the aim of the emitting orifices. The impacting speeds can be varied from 2.8 to 11.7 m/s. Droplet sizes from 70 to 200 μm are employed. Motions of the coalesced drop after the merging are bizarre and well-displayed. The results are important for spray modeling. When the streams of droplets merge at higher speeds, they may distort to the extent that the two streams of droplets merge to a single continuous sinuous stream.

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Abbreviations

b :

collision parameter

d :

diameter

Δp :

pressure difference

f :

frequency

u :

impact velocity

v :

droplet velocity

V :

liquid feed rate

x, y, z :

rectangular coordinates

α :

angle between droplet stream and symmetry line

G :

generator

i :

initial, before the collision

P :

particle

T :

droplet

1, 2:

first and second droplet generator

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Authors and Affiliations

  1. Institut für Thermodynamik der Luft- und Raumfahrt, Universität Stuttgart, 80, Stuttgart, FR Germany

    G. Brenn & A. Frohn

Authors
  1. G. Brenn
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  2. A. Frohn
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Brenn, G., Frohn, A. Collision and merging of two equal droplets of propanol. Experiments in Fluids 7, 441–446 (1989). https://doi.org/10.1007/BF00187061

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  • DOI: https://doi.org/10.1007/BF00187061

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