Pendant drop motion and stability in vertical airflow

When exposed to an ascending flow, pendant drops oscillate at magnitudes determined by windspeed, drop diameter, and needle diameter. In this study, we investigate the retention stability and oscillations of pendant drops in a vertical wind tunnel. Oscillation is captured by a high-speed camera for...

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Bibliographic Details
Published in:Physics of fluids (1994) 2024-02, Vol.36 (2)
Main Authors: Dockery, Jacob D., Aydin, Duygu Yilmaz, Dickerson, Andrew K.
Format: Article
Language:English
Subjects:
Air flow
Angular velocity
Flow stability
Fluid flow
High speed cameras
Motion stability
Reynolds number
Swept volumes
Vertical oscillations
Wind tunnels
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Summary:When exposed to an ascending flow, pendant drops oscillate at magnitudes determined by windspeed, drop diameter, and needle diameter. In this study, we investigate the retention stability and oscillations of pendant drops in a vertical wind tunnel. Oscillation is captured by a high-speed camera for a drop Reynolds number Re = 200–3000. Drops at Re ≲ 1000 oscillate up to 12 times the frequency of drops with high Re. Increasing windspeed enables larger volume drops to remain attached to the needles above Re = 500. We categorize drop dynamics into seven behavioral modes according to the plane of rotation and deformation of shape. Video frame aggregation permits the determination of a static, characteristic shape of our highly dynamic drops. Such a shape provides a hydraulic diameter and the evaluation of the volume swept by the oscillating drops with time. The maximum swept volume per unit drop volume occurs at Re = 600, corresponding to the peak in angular velocity.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0187843