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Thermal delay of drop coalescence

Research Square

Research Square

  • First Author :
    Michela Geri
  • Co-authors :
    Bavand Keshavarz, Gareth H. McKinley and John W. M. Bush
  • Journal Name :
    Journal of Fluid Mechanics
  • Read Full text :
  • DOI :
    https://doi.org/10.1017/jfm.2017.686

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Abstract

We present the results of a combined experimental and theoretical study of drop coalescence in the presence of an initial temperature difference Δ between a drop and a bath of the same liquid. We characterize experimentally the dependence of the residence time before coalescence on Δ for silicone oils with different viscosities. Delayed coalescence arises above a critical temperature difference Δ that depends on the fluid viscosity: for ΔΔ, the delay time increases as Δ 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.

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