Diffusion-Dominated Pinch-Off of Ultralow Surface Tension Fluids
Jack Hau Yung Lo, Yuan Liu, Sze Yi Mak, Zhuo Xu, Youchuang Chao, Kaye, Jiale Li, Ho Cheung Shum, and Lei Xu
TL;DR
This paper investigates how ultralow surface tension fluids undergo pinch-off primarily driven by bulk diffusion rather than fluid flow, revealing a new dominant mechanism in fluid breakup dynamics.
Contribution
It introduces the concept that diffusion can dominate pinch-off dynamics in ultralow surface tension fluids, contrasting with traditional flow-driven breakup.
Findings
Diffusion governs pinch-off at ultralow surface tensions
Velocity and profile analysis explain diffusion dominance
Transition from flow-driven to diffusion-driven breakup
Abstract
We study the breakup of a liquid thread inside another liquid at different surface tensions. In general, the pinch-off of a liquid thread is governed by the dynamics of fluid flow. However, when the interfacial tension is ultralow (2 to 3 orders lower than normal liquids), we find that the pinch-off dynamics can be governed by bulk diffusion. By studying the velocity and the profile of the pinch-off, we explain why the diffusion-dominated pinch-off takes over the conventional breakup at ultralow surface tensions.
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