title: Gravity-driven soap film dynamics in subcritical regimes.
abstract: We undertake the analysis of soap-film dynamics with the classical approach of asymptotic expansions. We focus our analysis in vertical soap film tunnels operating in subcritical regimes with elastic Mach numbers M(e)=O((10(-1))). Considering the associated set of nondimensional numbers that characterize this flow, we show that the flow behaves as a two-dimensional (2D) divergence free flow with variable mass density. When the soap film dynamics agrees with that of a 2D and almost constant mass density flow, the regions where the second invariant of the velocity gradient is non-null correspond to regions where the rate of change of film thickness is non-negligible.
authors.affiliation: Laboratory of Fluid Dynamics, Facultad de Ingeniería, Universidad de Buenos Aires and CONICET, Paseo Colón 850, C1063ACV Buenos Aires, Argentina.
authors.forename: M I
authors.initials: MI
authors.lastname: Auliel
authors.affiliation: Laboratory of Fluid Dynamics, Facultad de Ingeniería, Universidad de Buenos Aires and CONICET, Paseo Colón 850, C1063ACV Buenos Aires, Argentina.
authors.forename: F
authors.initials: F
authors.lastname: Castro
authors.affiliation: Laboratory of Fluid Dynamics, Facultad de Ingeniería, Universidad de Buenos Aires and CONICET, Paseo Colón 850, C1063ACV Buenos Aires, Argentina.
authors.forename: R
authors.initials: R
authors.lastname: Sosa
authors.affiliation: Laboratory of Fluid Dynamics, Facultad de Ingeniería, Universidad de Buenos Aires and CONICET, Paseo Colón 850, C1063ACV Buenos Aires, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Artana