Airway reopening mechanics depend on surfactant physicochemical properties. During reopening, the progression of a finger of air down an airway creates an interface that is continually expanding into the bulk fluid. Conventional surfactometers are not capable of evaluating physicochemical behavior under these conditions. To study these aspects, we investigated the pressure required to push a se...

– We present an evaporation experiment in a single fluid layer reproducing conditions of volatile fluids in nature. When latent heat associated to the evaporation is large enough, the heat flow through the free surface of the layer generates temperature gradients that can destabilize the conductive motionless state giving rise to convective cellular structures without any external heating. Conv...

The Bénard-Marangoni problem is a mathematical model for the description of a temperature dependent fluid flow in very thin liquid layers with a free top surface. The liquid is bounded from below by a horizontal plate of a certain temperature. Above the liquid there is an atmosphere cooler than the bottom plate. There is a purely conducting steady state, where the liquid is at rest. This state ...

A thin liquid coating can spread vertically beyond the equilibrium meniscus position by the application of a temperature gradient to the adjacent substrate. So called super-meniscus films experience a surface shear stress which drives flow toward regions of higher surface tension located at the cooler end of the substrate. The Marangoni stresses responsible for this spreading process can also b...

This work describes a new mechanism for the emergence of oscillatory dynamics driven by interaction hydrodynamic flows and reaction-diffusion processes with no autocatalytic feedback nor prescribed instability involved. To do so, we study an A+ B ? C front in presence chemically-driven Marangoni arbitrary initial concentrations reactants diffusion coefficients all species. All species are assum...

Abstract During metal additive manufacturing, the porosity of as-built part deteriorates mechanical property and even hinders further application manufacturing. Particularly, mechanisms keyhole pores associated with fluctuation are not fully understood. To reveal formation, we adopt a multiphysics thermal-fluid flow model incorporating heat transfer, liquid flow, evaporation, Marangoni effect, ...

Recent experiments by several groups have uncovered a novel fingering instability in the spreading of surface active material on a thin liquid film. The mechanism responsible for this instability is yet to be determined. In an effort to understand this phenomenon and isolate a possible mechanism, we have investigated the linear stability of a coupled set of equations describing the Marangoni sp...

In this study, we investigated the impact of a rotating magnetic field on stability thermocapillary flow in gallium arsenide liquid bridge (Prandtl number Pr = 0.068) situated between two unequal disks, considering different scenarios with radius ratios Γr 0.98 and 0.60 for upper heated disk. By utilizing linear analysis based Legendre spectral element method, first identified critical paramete...