International Journal of Microgravity Science and Application
Online ISSN : 2188-9783
Effects of Varying Temperature and Gravity on Impact Crater and Time Scales When a Drop Impacts onto a Wetted Surface
Murat DINC Donald D. GRAY
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JOURNAL OPEN ACCESS

2020 Volume 37 Issue 2 Pages 370204-

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Abstract

The impact of liquid drops with dry and wetted solid surfaces has numerous applications in both natural and engineered systems. These applications include but not limited to the cooling of electronic components, spray drying, and tissue engineering. Even though there are many research studies in drop impact area, earlier studies had largely ignored the effect of Froude number variation on single drop and spray research. However, Dinc and Gray showed that while the evolution of the craters was generally similar, the time scale and the height of the Worthington jet were strongly influenced as the value of gravity increased. Medam et al. confirmed these results with their preliminary analysis. This paper consists of major outcomes such as how the impact time scales and crater radiuses varying with gravity and buoyancy. This study includes simulations of a spherical water drop impacting an upward facing wetted surface for a case in which the flow is known to remain axisymmetric (Reynolds number = 6690, Weber number = 139, layer depth/drop diameter = 0.837, and contact angle = 0°) for different gravity and buoyancy conditions (different drop and layer temperature) based on some of the planets and asteroids in our Solar System. Varying the gravity level changes the Froude number from 1.83 to infinity. It is obtained that gravity significantly affects the impact dynamics and time scales whereas buoyancy does not significantly alter results at least based on the dimensional numbers considered in this study. Drop and layer buoyancy effects on liquid distribution are not substantial at early simulation times and become more significant at later times.

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© 2020 The Japan Society of Microgravity Application
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