The Effect of Number and Width of Baffles on Mixing Time in Copper Solvent Extraction Dynamic Mixers: CFD Simulation and Direct Photography

مهندسی متالورژی و مواد

Article 11, Volume 30, Issue 2 - Serial Number 20, 2019, Pages 113-118   

Document Type: Original Articles

DOI: 10.22067/ma.v30i2.63478

Authors

soroush parvizi^{* 1}; Eskandar Keshavarz Alamdari²; Seyed Soroush e din Razavi²

¹Shahid Rajaee Teacher Training University

²AmirKabir University of Technology

Abstract

The dynamic mixer has been designed and meshed according to copper solvent extraction mixer. Validation of data has been done by the experimental setup. k-ɛ turbulent model and sliding mesh have been used for fluid flow simulation. Organic and aqueous liquids have been provided from the solvent extraction unit of Sarcheshmeh copper complex, Iran. The mixing time has been calculated using population balance model outputs analysis. According to the results, by increasing the number and width of baffles, mixing process is improved and mixing time is decreased. Increasing turbulent flow intensity made to improve the efficiency in this situation. An equation has been developed for calculating mixing time. The variables of the equation are baffles number and width.

Keywords

population balance model; dynamic mixer; copper solvent extraction; mixing time; width and number of baffle; computational fluid dynamics

Supplementary Files

11- parvizi edited.pdf

References

1. Ascanio G., "Mixing time in stirred vessels: A review of experimental techniques", Chinese Journal of Chemical Engineering, Vol. 23, pp. 1065-1076, (2015).

2. Montante G., Paglianti A., "Gas hold-up distribution and mixing time in gas–liquid stirred tanks", Chemical Engineering Journal, Vol. 279, pp. 648-658, (2015).

3 Lu W.-M., Wu H.-Z., Ju M.-Y., "Effects of baffle design on the liquid mixing in an aerated stirred tank with standard Rushton turbine impellers", Chemical Engineering Science, Vol. 52, pp. 3843-3851, (1997).

4. Ammar M., Driss Z., Chtourou W., Abid M., "Effects of baffle length on turbulent flows generated in stirred vessels", Open Engineering, Vol. 1, pp. 401-412, (2011).

5. Masiuk S., Łacki H., Strek F., "Power consumption and mixing times for liquid mixing in a ribbon mixer", Chemical Engineering Journal, Vol. 48, pp. 135-140, (1992).

6. Brůha O., Brůha T., Fořt I., Jahoda M., "Dynamics of the flow pattern in a baffled mixing vessel with an axial impeller", Acta Polytechnica, Vol. 47, (2007).