Abstract
An experimental investigation of flow pattern regimes and mixing inside a T-type microchannel for different inlet flowrate ratios was carried out. Seven flow pattern regimes were obtained experimentally. Partial penetration of the flow into the opposite input channel with occurrence of one vortex was shown by Rahimi et al. [8]. We experimentally demonstrate arising of two vortex structures rotating about their axes in the case of partial penetration of the flow into the opposite input channel. In addition, we reveal appearance of periodic waviness streaks, absent in previous works. We also investigated the evolution of a transparent periodic vortex structure inside the outlet microchannel. It is a very slow periodic process. The mixing efficiency for all flow regimes is estimated. A maximum mixing of 0.87 is achieved for the streaks and unsteady regimes. We also discover that the biggest mixing efficiency is equal to 0.67, reached at \(R=0.25\) and a low outlet Reynolds number Re = 47.
Similar content being viewed by others
REFERENCES
Ansari, M.A., Kim, K.Y., Anwar, K., and Kim, S.M., Vortex Micro T-Mixer with Non-Aligned Inputs, Chem. Engin. J., 2012, vols. 181/182, pp. 846–850.
Chakraborty, D., Madoub, M., and Chakraborty, S., Anomalous Mixing Behaviour in Rotationally Actuated Microfluidic Devices, Lab Chip., 2011, vol. 11, pp. 2823–2826.
Dankwerts, P.V., The Definition and Measurements of Some Characteristics of Mixtures, Appl. Sci. Res., 1958, pp. 279–296.
Fani, A., Camarri, S., and Salvetti, M.V., Investigation of the Steady Engulfment Regime in a Three-Dimensional T-Mixer, Phys. Fluids, 2013, vol. 25, p. (064102)-17.
Kravtsova, A.Yu., Ianko, P.E., Kashkarova, M.V., and Bilsky, A.V., Investigation of the Perturbation Flow in a T-Microchannel Using the LIF Technique, J. Visual., 2019, vol. 22, no. 5, pp. 851–855.
Mariotti, A., Galletti, C., Mauri, R., Salvetti, M.V., and Brunazzi, E., Steady and Unsteady Regimes in a T-Shaped Micro-Mixer: Synergic Experimental and Numerical Investigation, Chem. Engin. J., 2018, vol. 341, pp. 414–431.
Poole, R.J., Alfateh, M., and Gauntlett, A.P., Bifurcation in a T-Channel Junction: Effects of Aspect Ratio and Shear-Thinning, Chem. Engin. Sci., 2013, vol. 104, pp. 839–848.
Rahimi, M., Akbari, M., Parsamoghadam, M., and Alsairafi, A., CFD Study on Effect of Channel Confluence Angle on Fluid Flow Pattern in Asymmetrical Shaped Microchannels, Computers Chem. Engin., 2015, vol. 73, pp. 172–182.
Sakakibara, J., and Adrian, R.J., Measurements of Temperature Field of a Rayleigh–Benard Convection Using Two-Color Laser-Induced Fluorescence, Exp. Fluids, 2004, vol. 37, pp. 331–340.
Sakakibara, J., Hishida, K., and Maeda, M., Measurements of Thermally Stratified Pipe Flow Using Image-Processing Techniques, Exp. Fluids, 1993, vol. 16, pp. 82–96.
Funding
The work was supported by the Russian Science Foundation (project no. 19-79-10217).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kravtsova, A.Y. Visualization of Flow Regimes in Symmetric Microchannel in Case of Different Inlet Flowrate Ratios for Fixed Outlet Reynolds Number. J. Engin. Thermophys. 29, 612–617 (2020). https://doi.org/10.1134/S1810232820040098
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1810232820040098