Document Type : Full article


1 School of Chemical Engineering, Iran University of Science and Technology (IUST), P.O. Box 16765-163, Tehran, Iran

2 Ms, Student, School of Chemical Eng. Iran University of Science and Technology (IUST)

3 Ms Student, School of Chemical Eng., Iran University of Science and Technology, Tehran


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 of the streams has been studied. The results show that the histograms of the light intensity changes from double peak (unmixed) to a single peak (mixed) at high elevations of the chamber. Mixing index has a linear descending behavior moving toward the cell front wall and it was shown that the mixing index can be reduced up to 50% moving from cell center to near wall region. Moreover, there is a transition zone in both equal and un-equal fluid flow rates in mixing index. It was shown that the third component velocity play an important role in mixing behavior in T-Type mixing chamber.


Main Subjects

[1]      Chhabra, R. P. and Richardson, J. F., Non-Newtonian Flow and Applied Rheology, 2nd ed., Elsevier,  p. 376 (2011) .
[2]      Boodhoo, K. V. K. and Al-Hengari, S., "Micromixing characteristics in a small scale spinning disc reactor", Chem. Eng. Tech., 35 (7), 1229 (2012).
[3]      Suh,Y. K. and Kang, S., "A Review on Mixing in Microfluidics" Micromachines, 1, 82 (2010).
[4]      Bockhorn, H. Mewes, D. Peukert, W. and Warnecke, W. H. J., Micro and Macro Mixing: Analysis, Simulation and Numerical Calculation, 1st ed., p. 69 (2009).
[5]      Schwertfirm, F. Gradl, J. Schwarzer, H. C. and Manhart, P. M. "The low Reynolds number turbulent flow and mixing in a confined impinging jet reactor", Int. J. Heat Fluid Flow, 28, 1429 (2007).
[6]      Fonte, C. P. Sultan, M. A. Santos, R. J. Dias, M. M. and Lopes, J. C. B. "Flow imbalance and Reynolds number impact on mixing in Confined Impinging Jets", Chem. Eng. J., 260, 316 (2015).
[7]      Lee, L. J.  Ottino, J. M. Ranz, W. E. and Macosko, C. W. "Impingement mixing in reaction injection molding", Polymer Eng. Sci., 20, 868 (1980).
[8]      Tucker, C. L. and Suh, N. P. "Mixing for reaction injection molding  Impingement mixing of liquids", Polymer. Eng. Sci., 20, 875 (1980).
[9]      Sandell, D. J.  Macosko, C. W.  and Ranz, W. E. "Visualization technique for studying impingement mixing at representative Reynolds numbers", Polymer. Proc. Eng., 3, 57 (1985).
[10]  Wood, P. Hrymak, A. Yeo, R. and Johnson, D. Tyagi, A., "Experimental and computational studies of the fluid mechanics in an opposed jet mixing head", Phys. Fluids, 1362 (1991).
[11]  Hoffmann, M.  Schluter, M.  and Rabiger, N. "Experimental investigation of liquidliquid mixing in T-shaped micro-mixers using l-LIF and l-PIV," Chem. Eng. Sci., 61,  2968 (2006).
[12]  Sultan, M. A. Fonte, C. P. Dias, M. M. Lopes, J. C. B. and Santos, R. J. "Experimental study of flow regime and mixing in T-jets mixers", Chem. Eng. Sci., 73, 388 (2012).
[13]  Walker, D. A., "A fluorescence technique for measurement of concentration in mixing liquids", J. Phys. Sci. Instru., 20, (1987).
[14]  Crimaldi, J. P. "Planar laser induced fluorescence in aqueous flows", Exp. Fluids, 44, 851 (2008).
[15]  Rose, H. E., "A suggested equation related to the mixing of powders", Trans. Inst. Chem. Eng., 37, 47 (1959).
[16]  Lacey, P. "Developments in theory of particulate mixing",  J. Appl. Chem., 4, 257 (1954).
[17]  Oh, D. W.  Jin, J. S.  Choi, J. H. Kim, H. Y. and Lee, J. S. "A microfluidic chaotic mixer using ferrofluid, iop publishing, J. micromech. microeng., 17, 2077 (2007).
[18]  Wang, C. T. and Hu, Y. C. "Mixing of Liquids Using Obstacles in Y-Type Microchannels", Tamkang Jour. of Sci. Eng., 13 (4), 385 (2010).
[19]  Le, T. N. Suh, Y. K. and Kang, S. "A numerical study on the flow and mixing in a microchannel using magnetic particles", J. Mech. Sci. Tech., 24, 441(2010).