1. Šefko Šikalo, Mašinski Fakultet Univerziteta u Sarajevu,
Federation of Bosnia and Herzegovina
, Bosnia and Herzegovina
2. Aleksandra Kostic
The experimental data of normal impact of liquid droplets onto solid, dry surfaces has been fitted. The goal is to find a simple faction that predicts time evolution of droplet spreading for different impact velocities. The focus of this paper is the quantitative determination of the influence of the impact velocity on the droplet spreading. The spreading velocity is high for the very early stage of the impact process, where inertial forces dominate, while at the later stages, the number of influencing parameters increases, as a result of capillary effects. Thus, generally it is difficult to find a function that describes this process well. Sets of experimental data, of droplet spreading diameter in terms of time, are fitted using a proper rational function. The rational function has two negative poles, i.e. the numerator is the first order polynomial and the denominator is the second order polynomial. Data for the impact of a water droplet, with diameter of 2.7 mm, and the Weber numbers 50, 90 and 161 were fitted to rational function line using least-squares. The proposed function fit the data well.
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Датум:
04.02.2017.
13th International Conference on Accomplishments in Mechanical and Industrial Engineering
