The characteristic length scales in direct mode of drop formation from the edges of spinning discs with different surface wetting characteristics

Sahoo, K (2022) The characteristic length scales in direct mode of drop formation from the edges of spinning discs with different surface wetting characteristics. In: Chemical Engineering Science, 263 .

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Abstract

The characteristic length-scales responsible for primary and secondary drop size in direct droplet mode are probed using discs of different surface wettability through exposure controlled high resolution static imaging. The primary drop formation from the edge of a hydrophobic disc is found to be mechanistically different from its hydrophilic counterparts. The disc wetting factor (w) influences primary drop size only at low Weber number (We). A single mean primary/secondary drop size-We relationship represents discs of different surface characteristics. It points to insignificance of surface wettability. For hydrophilic discs the mean primary drop size and the mean incipient bulge size vary as We-0.47 and We-0.5 respectively, which hints at incipient bulge size dependence of primary drop size. The two capillary wave-based length scales tested as characteristic length scales for secondary drops show high size variability, which is a distinctive feature of secondary drops.

Item Type:	Journal Article
Publication:	Chemical Engineering Science
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Direct droplet mode; Spinning disc atomization; Surface wettability
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	08 Oct 2022 03:56
Last Modified:	08 Oct 2022 03:56
URI:	https://eprints.iisc.ac.in/id/eprint/77217

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