Abstract The paper represents an analysis of convective instability in a vertical cylindrical porous microchannel performed using the Galerkin method. dependence critical Rayleigh number on Darcy, Knudsen, and Prandtl numbers, as well ratio thermal conductivities fluid wall, was obtained. It shown that decrease permeability medium (in other words, increase its porosity) causes flow stability. T...

The current microdevices used for biomedical research are often manufactured using microelectromechanical systems (MEMS) technology. Although it is possible to fabricate precise and reproducible rectangular microchannels using soft lithography techniques, this kind of geometry may not reflect the actual physiology of the microcirculation. Here, we present a simple method to fabricate circular p...

Temperature has a great influence on the normal operation and service life of high-power electronic components. To cope with increasingly severe heat problems in integrated circuits, an enhanced transfer factor E is introduced to evaluate comprehensive performance microchannel sinks (MCHS). The computational fluid dynamics (CFD) software was used numerically study flow characteristics cone-colu...

Abstract: This work presents a novel electromagnetic actuation concept that aims at the conversion of electromagnetic force into fluid power to enable gentle handling of biomedical fluids through circular microchannel. This concept is tested successfully on a mesoscale model and showed attractive concept suitable for microfluidic applications. In microtechnology, planar microcoils that offer en...

Abstract. In this paper, a Cascaded Lattice Boltzmann Method with second order slip boundary conditions is developed to study gas flows in a microchannel in the slip and transition flow regimes with a wide range of Knudsen numbers. For the first time the effect of wall confinement is considered on the effective mean free path of the gas molecules using a function with nonconstant Bosanquet para...

A scheme is presented to actively control particulate position in inertial microfluidics. The unilateral slip boundary applied regulate the velocity distribution of flow field microchannel, thus vertical equilibrium particle can be changed with length. Three kinds typical particles, namely circular, elliptical, and rectangular, are simulated. results demonstrate that positions manipulated withi...

• Microchannel heat sinks are modelled by conjugate transfer and laminar flow CFD. Four performance enhancement tape inserts tested individually combined. Tape axial twist improves the Nusselt number gains to hydraulic loss trade-off. With best heated base is 16 ℃ cooler at 100 W/cm 2 flux input. Sealing in barrel prevents tip leakage raises conduction. The continuous power increase miniaturiza...