Flow rate–pressure drop relations for new configurations of slender compliant tubes arising in microfluidics experiments

Acoustic waves in slender axisymmetric tubes

Acoustic waves in a rigid axisymmetric tube with a variable cross-section are considered. The governing Helmholtz equation is solved using Neumann series (expansions in Bessel functions of various orders) with a stretched radial coordinate, leading to a hierarchy of one-dimensional ordinary differential equations in the longitudinal direction. The lowest approximation for axisymmetric motion in...

A New Simple Analytical Model for Flow Analysis Over Slender Delta Wings

Drop-Based Microfluidics for Biological Applications

Drop-based microfluidic technology has been attracting great attention since the prevalence of soft-lithography techniques in poly-dimethylsiloxane (PDMS) microfluidic device fabrication a decade ago. The miniaturized isolated confinement of the droplet provides an ideal environment to study single cell behaviors in vitro that might otherwise be buried in the ensemble measurements. The effectiv...

Low-pressure plasma generation inside slender tubes

Low pressure (<50 mTorr) argon discharges inside tubes of a few millimeters in diameter have been studied by means of oneand twodimensional particle-in-cell Monte Carlo collision simulations. Magnetically confined DC and microwave discharges have been sustained in a coaxial configuration. For DC discharges, the magnetic field needs to be strong enough to confine secondary electrons emitted from...

Air-bubble-triggered drop formation in microfluidics.

In microfluidic devices, droplets are normally formed using T-junction or flow focus mechanisms. While both afford a high degree of control over drop formation, they are limited in maximum production rate by the jetting transition. Here, we introduce a new drop formation mechanism that is not limited by jetting, allowing much faster drop production.