Abstract High mass transfer rate is a key advantage of microreactors however, under their characteristic laminar flow, it dominated by slow diffusion rather than fast convection. In this paper, we demonstrate how the configuration inlet, i.e. mixers, can promote different flow patterns to greatly enhance mixing efficiency downstream. A systematic evaluation and comparison widely adopted mixers ...

Flows in a microchannel are laminar, which means that mixing depends on only inter-diffusion. A micromixer plays an important role in obtaining fast diagnosis results in the fields of m-TAS (total analysis system), Bio-MEMS and LOC (lab-on-a-chip). In this paper, we propose a new active mixer with vertical flow placement via a series of inlets for micromixing. This has two inlets on the same ax...

A novel droplet mixing measurement technique is presented that employs single fluorophore laser-induced fluorescence, custom image processing, and statistical analysis for monitoring and quantifying mixing in confined, high-speed droplet collisions. The diagnostic procedure captures time-varying fluorescent signals following binary droplet collisions and reconstructs the spatial concentration f...

A Laser Induced Fluorescence technique (LIF) has been used to study the mixing behavior of two emerging streams in a T-Type mixing chamber. A mixing index on the basis of digital image light intensities is calculated. It has been shown that averaging over more than 800 images leads to a stable mixing index calculation. Moreover, the effect of equal and un-equal flow rates on the mixing behavior...

Micromixers have important applications in various pharmaceutical and medical fields. In the present study, enhancement of mixing index electroosmotic micromixer with different geometries is investigated. The commercial software COMSOL Multiphysics 5.4 employed to solve mathematical models. SIMPLEC
 algorithm for coupling velocity pressure A second-order upwind scheme used reduce artificia...

The growth rate and uniformity of Carbon Nano Tubes (CNTs) based on Chemical Vapor Deposition (CVD) technique is investigated by using a numerical model. In this reactor, inlet gas mixture, including xylene as carbon source and mixture of argon and hydrogen as  carrier gas enters into a horizontal CVD reactor at atmospheric pressure. Based on the gas phase and surface reactions, released carbon...

The mixing-plane method for calculating the three-dimensional flow through multistage turbomachinery is used to perform flutter analysis on a single stage transonic compressor. The turbomachine considered is composed of an inlet guide vane (IGV) and a compressor blade (NASA Rotor 67). The mixing-plane boundary condition enables steady and unsteady computation of the flow through multiple blade ...

This paper proposes novel microfluidic concentration gradient generator (CGG) devices that are capable of constructing complex profiles of chemical concentrations by laterally combining the constituent profiles (e.g., linear and bell-shaped) generated in simple Y- or psi-shaped mixers. While the majority of currently existing CGG devices are based on complete mixing of chemical species, our des...

The effect of stirring in an inhomogeneous oscillatory medium is investigated. We show that the stirring rate can control the macroscopic behavior of the system producing collective oscillations (synchronization) or complete quenching of the oscillations (oscillator death). We interpret the homogenization rate due to mixing as a measure of global coupling and compare the phase diagrams of stirr...