Effect of laminar velocity profile variation on mixing in microfluidic devices: The sigma micromixer

Yakhshi Tafti, Ehsan; Kumar, Ranganathan; Cho, Hyoung J.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p143504
Academic Journal
The effect of the laminar velocity profile and its variation on mixing phenomena at the reduced scale is studied. It is shown that the diffusive mass flux between two miscible streams, flowing laminar in a microchannel, is enhanced if the velocity at their diffusion interface is increased. Based on this idea, an in-plane passive micromixing concept is proposed and implemented in a working device (sigma micromixer). This mixer shows considerable mixing performance by periodically varying the flow velocity profile, such that the maximum of the profile coincides with the transversely progressing diffusion fronts repeatedly throughout the mixing channel.


Related Articles

  • Static mixer-Principles of operation.  // Chemical Business;Jan2008, Vol. 22 Issue 1, p59 

    The article discusses the principles of operation of the Cleveland static mixer from EMI Inc. Mixing Technology group. It states that this device depends on the principles of radial momentum transfer, flow division and shear plane reversal. It mentions that the device has an elliptical shape...

  • The NETmix reactor: Pressure drop measurements and 3D CFD modeling. Fonte, Carlos M.; Leblebici, M. Enis; Dias, Madalena M.; Lopes, José Carlos B. // Chemical Engineering Research & Design: Transactions of the Inst;Nov2013, Vol. 91 Issue 11, p2250 

    NETmix is a new static mixing technology based on a network of mixing chambers interconnected by channels. Three NETmix reactors with different geometries were used to obtain experimental data for pressure drop and a generalized model for pressure drop in NETmix reactors has been developed. This...

  • Numerical Model for Laminar Flow in an Agitated Vessel by Inclined Blades Anchor. Bouanini, M.; Youcefi, A.; Mebarki, B.; Rahmani, L.; Hami, O.; Draoui, B. // International Review of Mechanical Engineering;May2008, Vol. 2 Issue 3, p364 

    A large number of chemicals, biochemical or petrochemical industry operations are performed in stirred tanks or in mechanically agitated vessels. The optimum operating mode of these equipments requires a detailed knowledge of the hydrodynamic behaviour induced by the agitator. In this piece of...

  • Determination of the Segregation Index to Sense the Mixing Quality of Pilotand Production-scale Microstructured Mixers. Men, Y.; Hessel, V.; Löb, P.; Löwe, H.; Werner, B.; Baier, T. // Chemical Engineering Research & Design: Transactions of the Inst;May2007, Vol. 85 Issue 5, p605 

    The performance of the microstructured mixer Star-Laminator300 ( StarLam300) with stacked star-shaped foils has been examined experimentally by the use of the adapted Villermaux/Dushman parallel-competitive iodide-iodate reaction system in continuous processes. The mixing efficiency was...

  • Quantitative Mixing Analysis of Laminar Flow in Circle Grid Perforated Plate with 50% Porosity Static Mixer. Mohd Zamadi, Mat Loddin; Amir, Khalid; Bukhari, Manshoor // Applied Mechanics & Materials;2014, Issue 541-542, p836 

    The applications of the static mixers are widely applied in many industries to obtain the desired type of mixing. In this context, to perform the mixing process should have two different fluids that also have different properties which will combines it in a single equipment to make an another...

  • Rapid circular microfluidic mixer utilizing unbalanced driving force. Che-Hsin Lin; Chien-Hsiung Tsai; Chih-Wen Pan; Lung-Ming Fu // Biomedical Microdevices;Feb2007, Vol. 9 Issue 1, p43 

    Abstract??This paper proposes a novel rapid circular microfluidic mixer for micro-total-analysis-systems (?-TAS) applications in which an unbalanced driving force is used to mix fluids in a circular chamber at low Reynolds numbers (Re). The microfluidic mixer has a three-layered structure and is...

  • Heat Transfer to Bingham Fluid During Laminar Flow in Agitated Tank. Rahmani, L.; Draoui, B.; Mebarki, B.; Bouanini, M.; Hami, O. // International Review of Mechanical Engineering;Mar2009, Vol. 3 Issue 2, p156 

    Heat transfer to Bingham plastic fluids in an agitated vessel is a commonly used in chemical and food industry processes. However, little is known about the effects of mixing system geometry and the influence of rheological properties of the liquids on the heat transfer phenomenon. The...

  • Structure development during chaotic mixing in the journal bearing flow. Galaktionov, O. S.; Anderson, P. D.; Peters, G. W. M. // Physics of Fluids;Sep2002, Vol. 14 Issue 9, p3009 

    Laminar mixing in the two-dimensional time-periodic Stokes flows between eccentric cylinders [journal bearing flow (JBF)] is studied using the extended mapping method [Galaktionov et al., Int. J. Multiphase Flows 28, 497 (2002)] with the emphasis on the material stretching, e.g., the interface...

  • Effective diffusion in laminar convective flows. Rosenbluth, M. N.; Berk, H. L.; Doxas, I.; Horton, W. // Physics of Fluids (00319171);Sep87, Vol. 30 Issue 9, p2636 

    The effective diffusion coefficient D* of a passive component, such as test particles, dye, temperature, magnetic flux, etc., is derived for motion in periodic two-dimensional incompressible convective flow with characteristic velocity v and size d in the presence of an intrinsic local...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics