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Fluids 2018, 3(1), 10; doi:10.3390/fluids3010010

Design of a Novel μ-Mixer

Scientific Computing Department, STFC, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 10 January 2018 / Accepted: 24 January 2018 / Published: 28 January 2018
(This article belongs to the Special Issue Flow and Heat or Mass Transfer in the Chemical Process Industry)
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In this work, the efficiency of a new μ-mixer design is investigated. As in this type of devices the Reynolds number is low, mixing is diffusion dominated and it can be enhanced by creating secondary flows. In this study, we propose the introduction of helical inserts into a straight tube to create swirling flow. The influence of the insert’s geometrical parameters (pitch and length of the propeller blades) and of the Reynolds number on the mixing efficiency and on the pressure drop are numerically investigated. The mixing efficiency of the device is assessed by calculating a number—i.e., the index of mixing efficiency—that quantifies the uniformity of concentration at the outlet of the device. The influence of the design parameters on the mixing efficiency is assessed by performing a series of ‘computational’ experiments, in which the values of the parameter are selected using design of experiments (DOE) methodology. Finally using the numerical data, appropriate design equations are formulated, which, for given values of the design parameters, can estimate with reasonable accuracy both the mixing efficiency and the pressure drop of the proposed mixing device. View Full-Text
Keywords: mixing; computational fluid dynamics (CFD); microfluidics; chaotic advection; helical insert mixing; computational fluid dynamics (CFD); microfluidics; chaotic advection; helical insert

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kanaris, A.G.; Mouza, A.A. Design of a Novel μ-Mixer. Fluids 2018, 3, 10.

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