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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Droplet impact and spreading around the thin solid vertical cylinder: A numerical approach

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.2670
pages 1773-1778

摘要

The dynamic characteristics of a water droplet impact and subsequent encapsulation around the thin vertical dry solid cylinder are studied numerically. Finite volume method (FVM)-based axisymmetric simulations are performed by employing the volume of fluid (VOF) method to predict complex hydrodynamic behaviors. Conservation equations of mass and momentum and the volume fraction equation are solved to simulate the present computational work. The droplet surface undergoes a continuous deformation during hitting and encapsulation around the thin cylinder dry surface by resulting in various crucial stages: free fall, hitting, splitting, merging, oscillation, and detachment. The cylinder-to-droplet diameter ratio (Dc/Do) range from 0.5 to 1.0 is considered for the present computational study to observe different deformation patterns of the droplet during the hitting and encapsulation process. Simulations are also carried out to understand the effect of cylinder surface wettability (from hydrophilic to superhydrophobic surfaces) during the hitting and encapsulation of water droplets by varying a wide range of contact angles. The effect of the cylinder-to-droplet diameter ratio, contact angle, and Weber number on the droplet impacting, including the droplet profile and deformation during encapsulation, is further investigated. The results show that the maximum deformation factor increase with increasing Weber number and reducing contact angle.