Novel Multi-dimensional Upwind Constrained Transport (MUCT) schemes on un-structured triangular grids are described. Constrained Transport (CT) discretizations conserve the divergence-free nature of divergence-free vector fields on the discrete level. Multi-dimensional Upwind (MU) schemes generalize the concept of dimensionally split upwind schemes for hyperbolic systems to truly multidimension...

Here we map gas-liquid two-phase flow regimes observed in polymeric microchannels with different wetting properties. We utilized video and confocal microscopy to examine two-phase flow patterns produced by parallel injection of air and water through a Y-shaped junction into a rectangular microchannel made of poly(dimethylsiloxane) (PDMS). We observed seven flow regimes in microchannels with hyd...

We present a DNA nanostructure, the three-helix bundle (3HB), which consists of three double helical DNA domains connected by six immobile crossover junctions such that the helix axes are not coplanar. The 3HB motif presents a triangular cross-section with one helix lying in the groove formed by the other two. By differential programming of sticky-ends, 3HB tiles can be arrayed in two distinct ...

This study explores heat diffusion effects inmicro-channel heat sinks intended for electronic cooling applications. Detailed analytical models are constructed for heat sinks havingmicro-channels with rectangular, inverse trapezoidal, triangular, trapezoidal, anddiamond-shaped cross sections. Solutions are presented for both monolithic heat sinks and heat sinks with perfectly insulating cover pl...

This letter presents a numerical design method of one-body two-dimensional (2-D) switching matrices with triangular lattice an arbitrary number beams in each horizontal and vertical directions, improving the overlap between 2-D multiple-beam coverage. With proposed matrix configuration, minimum cascaded units consisting mix 1-D couplers phase shifters is found to be smaller than that convention...

We present experiments in which the laterally confined flow of a surfactant film driven by controlled surface tension gradients causes the subtended liquid layer to self-organize into an inner upstream microduct surrounded by the downstream flow. The anomalous interfacial flow profiles and the concomitant backflow are a result of the feedback between two-dimensional and three-dimensional microf...

In this study, the effects of microchannel number, volume concentration, Reynolds and nanofluid type on heat transfer flow characteristics in sink consisting trapezoidal microchannels are investigated numerically. Governing equations solved by assuming three-dimensional, incompressible, steady laminar flow. The channel material is chosen as copper, a constant flux boundary condition defined upp...

We present a straightforward microfluidics system to achieve step-by-step reaction sequences in a diffusion-controlled manner in quasi two-dimensional micro-confinements. We demonstrate the hierarchical self-organization of actin (actin monomers-entangled networks of filaments-networks of bundles) in a reversible fashion by tuning the [Formula: see text] ion concentration in the system. We show...