Enhancement of wall friction by fixed cap bubbles

Abstract

The three-dimensional flow around a hemispherical bubble fixed on a wall in a viscous linear shear flow is solved by using direct numerical simulation. The results are used to analyze the effect of the bubble presence on the wall friction. The wall drag is found to be increased by the presence of the bubble fixed on the wall whatever the value of the shear Reynolds number.

Numerical simulation of bubble generation in a T-junction

“…Both bubble and slug flow simulations, where the defin according to the classical cr [15]. The transition betwe considered to take place wh the value of the capillary diam For a given USG and small v a marginal churn pattern experiments [9], but it is n study.…”

“…Both bubble and slug flow patterns w simulations, where the definition of eac according to the classical criterion propo [15]. The transition between bubble considered to take place when the bubb the value of the capillary diameter.…”

“…The numerical code JADIM developed in the Institut de Mécanique des Fluides de Toulouse (IMFT) has been applied to a variety of fluid dynamics problems [11,12,13,14,15,16,17,18,19,20]. The Volume of Fluid (VoF) module of JADIM is able to perform local analyses of deformable two phase interfaces by resolving the Navier-Stokes equations for incompressible fluids in non-stationary problems.…”

Numerical simulation of static and sliding drop with contact angle hysteresis

“…The validation of the Navier-Stokes solver of JADIM has been described in many previous studies dealing with particle or bubble hydrodynamics using boundary fitted domains (see for example [34][35][36]41,43]). The ability of the Volume of Fluid (VoF) modulus of JADIM to simulate the deformation and motion of fluid-fluid interfaces has been presented in [3,7,8] for unbounded dispersed two-phases flows.…”

The friction of a mesh-like super-hydrophobic surface

“…1d). These surfaces can be obtained by making holes in an otherwise flat material [26], and have been used to study the influence of the geometry of the liquid/air free interface on the viscous friction of the surface [27,28,29,30]. A super-hydrophobic surface with a continuous solid phase can also be obtained by using an intertwined solid mesh.…”