High-Speed Binary Water Droplet Collision with Different Surface Tension
Date Issued
2008
Date
2008
Author(s)
Chou, Ping-Chung
Abstract
High-Speed Binary Water Droplet Collision with Different Surface Tensioning-Chung Choudvisor：Kuo-Long Pan, Ph.D.epartment of Mechanical Engineeringational Taiwan Universitybstracthis study aims at droplet generation with different water solution to achieve a head-on collision and to observe the phenomenon under head-on collision. The set of devices for droplet generation and for observation of droplet collision are elaborated, through changing the parameters of solution (such as surface tension, size and velocity of droplets) and collecting the instant image by a high-speed camera to get more understanding of droplet collision phenomenon. In this experimental study, the most attention is given to two aspects. The first one is to generate a stable droplet with low and high speed respectively by using a droplet generator and a gas cylinder. At this stage we can control the size and velocity of a droplet. The second stage of experiment is to provide the droplet with head-on collision, whereby the size of two droplets must be almost the same, and then we observe the phenomenon. We expect to provide explicit and full data for droplet collision phenomena on this experiment. n spite of numerous researches on droplet collision, most of the research investigated into low Weber number of droplet. Therefore, this experiment is mainly focused on how to generate a high-speed (high Weber number) droplet and to make the droplet always keep head-on collision. The variables in this experiment include the droplet surface tension, the size and the velocity of droplet, the diameter of nozzle, the voltage and the frequency of signal generator, the pressure of gas cylinder, and the rotational speed of motor tested. he conclusions of this experiment consist of three parts. In the first part, we observe and discuss the collision of low velocity (low Weber number). The second is to describe the experimental results of high velocity (high Weber number) droplet collision. The third is to observe and discuss the phenomena of droplet collision under different surface tensions. eywords: droplet collision, droplet generator, high-speed droplet, surface tension, Weber number, signal generator.
Subjects
droplet collision
droplet generator
high-speed droplet
surface tension
Weber number
signal generator
Type
thesis
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