Thermal delay of drop coalescence
Name
jfm2017_Marangoni_final.pdf
Description
Author final manuscript
Size
3.49 MB
Format
Adobe PDF
Checksum (MD5)
0c47ab00d49398bfbee9d691e29360ef
Author(s)
Geri, Michela
Keshavarz, Bavand
McKinley, Gareth H
Bush, John W. M.
Date Issued
November 2017
Journal
Journal of Fluid Mechanics
Publisher
Cambridge University Press
Citation
Geri, Michela et al. “Thermal Delay of Drop Coalescence.” Journal of Fluid Mechanics 833 (December 2017): R3 © 2017 Cambridge University Press
Version
Author's final manuscript
Abstract
We present the results of a combined experimental and theoretical study of drop coalescence in the presence of an initial temperature difference 𝛥T[subscript 0] between a drop and a bath of the same liquid. We characterize experimentally the dependence of the residence time before coalescence on 𝛥T[subscript 0] for silicone oils with different viscosities. Delayed coalescence arises above a critical temperature difference 𝛥T[subscript c] that depends on the fluid viscosity: for 𝛥T[subscript 0] > 𝛥T[subscript c], the delay time increases 𝛥T[subscript 0] [superscript 2/3] as for all liquids examined. This observed dependence is rationalized theoretically through consideration of the thermocapillary flows generated within the drop, the bath and the intervening air layer.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1017/jfm.2017.686
