• Publications
  • Influence
Formation of droplets and bubbles in a microfluidic T-junction-scaling and mechanism of break-up.
Experimental results support the assertion that the dominant contribution to the dynamics of break-up arises from the pressure drop across the emerging droplet or bubble.
Chaotic Mixer for Microchannels
This work presents a passive method for mixing streams of steady pressure-driven flows in microchannels at low Reynolds number, and uses bas-relief structures on the floor of the channel that are easily fabricated with commonly used methods of planar lithography.
Effective slip in pressure-driven Stokes flow
Nano-bubbles have recently been observed experimentally on smooth hydrophobic surfaces; cracks on a surface can likewise be the site of bubbles when partially wetting fluids are used. Because these
An overview of flows in microdevices with focus on electrokinetics, mixing and dispersion, and multiphase flows is provided, highlighting topics important for the description of the fluid dynamics: driving forces, geometry, and the chemical characteristics of surfaces.
Formation of dispersions using “flow focusing” in microchannels
A flow-focusing geometry is integrated into a microfluidic device and used to study drop formation in liquid–liquid systems. A phase diagram illustrating the drop size as a function of flow rates and
A simple derivation of the time‐dependent convective‐diffusion equation for surfactant transport along a deforming interface
A derivation of the convective‐diffusion equation for transport of a scalar quantity, e.g., surfactant, along a deforming interface is outlined. The direct contribution of interface deformation,
Transition from squeezing to dripping in a microfluidic T-shaped junction
We describe the results of a numerical investigation of the dynamics of breakup of streams of immiscible fluids in the confined geometry of a microfluidic T-junction. We identify three distinct
Dynamics of Drop Deformation and Breakup in Viscous Fluids
This article describes the dynamics of drop deformation and breakup in viscous flows at low Reynolds numbers. An attempt has been made to bring together a wide range of studies in the drop
Swimming in circles: motion of bacteria near solid boundaries.
A hydrodynamic model is provided for near a solid boundary, Escherichia coli swims in clockwise circular motion and the radius of curvature of the trajectory is observed to increase with the length of the bacterium body.
Geometrically mediated breakup of drops in microfluidic devices.
Two methods for passively breaking larger drops into precisely controlled daughter drops using pressure-driven flow in simple microfluidic configurations using a T junction and flow past isolated obstacles are demonstrated.