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- W2072472020 abstract "We study the dynamics of thin free viscous films in the presence of exothermic chemical reactions, which alter the film density and viscosity. We use long-wave theory and the assumption of rapid vertical diffusion to derive a coupled system of evolution equations for the film thickness, axial velocity, temperature, and reactant and product concentrations; appropriate closure relations are chosen for the dependence of the density and viscosity (both dynamic and bulk) on the product concentration and temperature. Analytical and numerical solutions of the evolution equations allow a full parametric study to be conducted. The results indicate that the film dynamics is primarily governed by density variations, which depend on competing factors: the increase in product concentration and temperature (due to the heat of reaction), which act to increase and decrease the density, respectively. Thus the film can collapse and rupture (expand) if the former (latter) effects outweigh the latter (former); here, rupture is driven by van der Waals forces." @default.
- W2072472020 created "2016-06-24" @default.
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- W2072472020 date "2005-12-01" @default.
- W2072472020 modified "2023-09-27" @default.
- W2072472020 title "Dynamics of thin free films with reaction-driven density and viscosity variations" @default.
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- W2072472020 doi "https://doi.org/10.1063/1.2130966" @default.
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