Dynamics of viscoelastic liquid filaments: Low capillary number flows

Dynamics of low capillary number interfaces moving through sharp features

The success of any nanoimprint process depends upon its ability to exactly reproduce the template pattern. Thus, complete filling of recessed features in the template is an important issue that is controlled by the dynamics of the flow through these sharp structures. At these small scales, capillary forces are large and must be included in the fluid flow model. The mechanism of interface advanc...

Dissipative Particle Dynamics Modelling of Low Reynolds Number Incompressible Flows

Capillary Flows: Dynamics and Geometry Effects

Microfluidic is widely used to create miniaturized and portable devices. Such devices are aimed to constitute diagnostic tools for health monitoring, food industry and environmental monitoring. Considering health care, point-ofcare (POC) and home-care devices have been first developed to provide tools for the developing world, but now they are thought to be a universal solution. Such systems ar...

Formation of microfibers and nanofibers by capillary-driven thinning of drying viscoelastic filaments

Recent experiments have shown that it is possible to self-assemble very uniform polymeric microfibers and nanofibers by exploiting elasto-capillary thinning of macroscopic liquid bridges (Harfenist et al., Nano Lett., 4(10), 2004). We develop a model of this process that describes the simultaneous viscoelasto-capillary thinning and drying of polymeric liquid filaments. A one-dimensional formula...

Instability and dynamics of thin viscoelastic liquid films.

The instability, rupture, and subsequent growth of holes in a thin Jeffreys-type viscoelastic film under the influence of long-range van der Waals force are investigated using both linear stability analysis and nonlinear numerical solutions. The linear stability analysis of full governing equations valid for arbitrary wave numbers shows that although fluid rheology does not influence the domina...