Comparison of mixing performances of T, Y and arrow-shaped micromixers using Villermaux-Dushman protocol at low Reynolds number

Onyeka Stanislaus Okwundu, Mohammed Fuseini, Ahmed H. El-Shazly, Marwa F. Elkady

Abstract


Mixing performance is commonly assessed using the Villermaux-Dushman protocol. Mixing in passive mixers may be desired at very low Reynolds number (Re). This study is aimed at comparing the mixing performances of T, Y and arrow-shaped micromixers using Villermaux-Dushman protocol at Re < 100. Mixing performance test was run at flow rates of 500 to 1 mL h-1 with pressure drop measurement. Based on UV absorbance values and experimental mixing times of mixed fluids from the three micromixers, the order of mixing performance at Re > 26.5 was Y < T < arrow-shaped micromixers. At lower Re values, the order of performance based on absorbance and experimental mixing times, became inconsistent. However, comparison of mixing performance based on predicted mixing time gave consistent order of performance at all Re values. Instability in UV absorbance of mixed reagents in Villermaux-Dushman protocol was noted as the major cause of the reported inconsistency at very low Re. Inadequacy of Villermaux-Dushman protocol at low Re was verified via facile solvent extraction test. A more reliable technique should be used to assess mixing performance of micromixers at very low Re and on-line UV measurement should be adopted for Villermaux-Dushman experiment.


Keywords


probiotics; efficiency of mixers; iodide/iodate test experiment; passive mixers; micro-channel; laminar flow regime; confluence shape

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DOI: https://doi.org/10.2298/JSC190328095O

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