Breakup versus coalescence of closely packed fluid drops in simple shear flows
作者： Nilkamal Barai , Nibir Mandal
DOI: 10.1016/J.IJMULTIPHASEFLOW.2018.11.002
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摘要: Abstract Using computational fluid dynamic (CFD) simulations, based on an improved conservative level set method we investigated the dynamics of mechanically interacting drops in closely packed drop systems under simple shear flow. Our 2D simulations show concentration (ψ) as a key factor, addition to capillary number (Ca) controlling two competing processes: breakup and coalescence. For given ψ, process governs when Ca exceeds critical value (Cac); this is replaced by coalescence 0.2) numbers, respectively high concentrations (ψ > 0.4). The first mechanism develops single bridge between adjoining drops, which grows diameter non-linearly with time. We predict distinctive non-linear relations for collision pull-apart configurations. finally synthesize mechanisms ψ – space.
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