The pressure drop characteristics of supercritical carbon dioxide (S-CO 2 ) are experimentally studied in horizontal rectangular microchannels with hydraulic diameters 1 and mm, which used printed circuit heat exchangers. operating conditions include an 9–12 MPa, a mass flux 290–1200 kg/m s, 25–50 kW/m . four contributors to the S-CO were investigated. results indicate that total decreases for ...

Handling of sub-micrometer bioparticles such as bacteria are becoming increasingly important in the biomedical field and in environmental and food analysis. As a result, there is an increased need for less labor-intensive and time-consuming handling methods. Here, an acoustophoresis-based microfluidic chip that uses ultrasound to focus sub-micrometer particles and bacteria, is presented. The ab...

Since microfabrication techniques are typically planar processes, microchannel flows typically have significant predevelopment due to the upstream reservoir having the same height as the microchannel. The main concerns of the current study are categorized into finding the effects of typical microchannel geometry on the velocity entrance length in the laminar flow regime and providing the turbul...

Magnetism-based microsystems, as those dedicated to immunoaffinity separations or (bio)chemical reactions, take benefit of the large surface area-to-volume ratio provided by the immobilized magnetic beads, thus increasing the sensitivity of the analysis. As the sensitivity is directly linked to the efficiency of the magnetic bead capture, this paper presents a simple method to enhance the captu...

This study describes the numerical simulation of three-dimensional droplet formation and the following motion in a cross-junction microchannel by using the Lattice Boltzmann Method (LBM). Our aim is to develop the three-dimensional binary fluids model, consisting of two sets of distribution functions to represent the total fluid density and the density difference, which introduces the repulsive...

We report a contraction-expansion array (CEA) microchannel for rapidly and homogeneously mixing different types of fluids by multivortex induced in alternately formed rectangular structures of the channel. Rapid mixing can be achieved in a topologically simple and easily fabricated CEA microchannel, employing a synergetic combination of two kinds of vortices: (1) expansion-vortices being induce...

Within the new generation of advanced central solar receivers, microchannel pressurised gas receivers are emerging as reliable and efficient alternatives to operate at high temperatures pressures. This paper presents an optimisation comparative analysis different compact plate-fin type structures, constituting receiver’s absorber panels, classified according fin arrangement inside: plain rectan...

Computational fluid dynamics was used and a numerical simulation analysis of boiling heat transfer in microchannels with three depths cross-sectional profiles conducted. The coefficient bubble generation process microchannel structures width 80 μm depth 40, 60, were compared during the process, factors influencing studied. A visual test bench built, substrates different sizes prepared using mic...

In fully-developed pressure-driven flow, the spreading of a dissolved solute is enhanced in flow direction due to transverse velocity variations phenomenon now commonly referred as Taylor–Aris dispersion. It well understood that characteristics dispersion are sensitive channel’s cross-sectional geometry. Here we demonstrate method for manipulation single rectangular microchannel via controlled ...

Particle focusing in planar geometries is essentially required in order to develop cost-effective lab-on-a-chips, such as cell counting and point-of-care (POC) devices. In this study, a novel method for sheathless particle focusing, called "Elasto-Inertial Particle Focusing", was demonstrated in a straight microchannel. The particles were notably aligned along the centerline of the straight cha...