Πλοήγηση ανά Συγγραφέα "Matar, O. K."
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Bubble rise dynamics in a viscoplastic material
Tripathi, M. K.; Sahu, K. C.; Karapetsas, G.; Matar, O. K. (2015)The axisymmetric dynamics of a bubble rising in a Bingham fluid under the action of buoyancy is studied. The Volume-of-Fluid (VOF) method is used to solve the equations of mass and momentum conservation, coupled to an ... -
Effect of Contact Line Dynamics on the Thermocapillary Motion of a Droplet on an Inclined Plate
Karapetsas, G.; Sahu, K. C.; Matar, O. K. (2013)We study the two-dimensional dynamics of a droplet on an inclined, nonisothermal solid substrate. We use lubrication theory to obtain a single evolution equation for the interface, which accounts for gravity, capillarity, ... -
Linear and nonlinear stability of hydrothermal waves in planar liquid layers driven by thermocapillarity
Saenz, P. J.; Valluri, P.; Sefiane, K.; Karapetsas, G.; Matar, O. K. (2013)A shallow planar layer of liquid bounded from above by gas is set into motion via the thermocapillary effect resulting from a thermal gradient applied along its interface. Depending on the physical properties of the liquid ... -
Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature
Tripathi, M. K.; Sahu, K. C.; Karapetsas, G.; Sefiane, K.; Matar, O. K. (2015)We study the motion of a bubble driven by buoyancy and thermocapillarity in a tube with a non-uniformly heated walls, containing a so-called 'self-rewetting fluid'; the surface tension of the latter exhibits a parabolic ... -
Numerical simulation of pressure-driven displacement of a viscoplastic material by a Newtonian fluid using the lattice Boltzmann method
Swain, P. A. P.; Karapetsas, G.; Matar, O. K.; Sahu, K. C. (2015)The pressure-driven displacement of a non-Newtonian fluid by a Newtonian fluid in a two-dimensional channel is investigated via a multiphase lattice Boltzmann method using a non-ideal gas equation of state well-suited for ... -
On phase change in Marangoni-driven flows and its effects on the hydrothermal-wave instabilities
Saenz, P. J.; Valluri, P.; Sefiane, K.; Karapetsas, G.; Matar, O. K. (2014)This paper investigates the effects of phase change on the stability of a laterally heated liquid layer for the first time. The interface is open to the atmosphere and vapor diffusion is the rate-limiting mechanism for ... -
Thermocapillary-Driven Motion of a Sessile Drop: Effect of Non-Monotonic Dependence of Surface Tension on Temperature
Karapetsas, G.; Sahu, K. C.; Sefiane, K.; Matar, O. K. (2014)We study the thermocapillary-driven spreading of a droplet on a nonuniformly heated substrate for fluids associated with a non-monotonic dependence of the surface tension on temperature. We use lubrication theory to derive ...