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Numerical Investigation of an Active Micromixer with Oscillating Elastic Wall and Mixing Chamber: Parametric Study and Optimization | ||
| Computational Sciences and Engineering | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 06 اردیبهشت 1405 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22124/cse.2026.33130.1166 | ||
| نویسندگان | ||
| Tohid Adibi* 1؛ Seyed Esmail Razavi2 | ||
| 1University of Bonab | ||
| 2University of Tabriz | ||
| چکیده | ||
| This study numerically investigates mixing performance in an active micromixer combining geometric modification and oscillating wall excitation. The proposed design features two variable-angle inlets (45°, 60°, 90°, and 180°), a circular mixing chamber (R = 10 and 12.5 mm), and a flexible oscillating outlet section (2-8 Hz, 1-3.5 mm amplitude). A two-way fluid-structure interaction (FSI) approach in COMSOL Multiphysics captures the mutual effects between fluid flow and the elastic wall. Water enters at 20°C and 80°C with Reynolds numbers of 100-825 in laminar flow regime, with average outlet temperature serving as the mixing indicator. Results show that increasing oscillation frequency and amplitude enhances mixing, with 8 Hz and 3 mm identified as optimal. The 60° Y-configuration outperforms the conventional T-mixer (90°) and parallel inlet (180°). While the mixing chamber generally improves performance, its effect is less pronounced at the optimal 60° angle. Unequal inlet velocities generate Kelvin-Helmholtz instability, creating shear-induced vortices that further enhance mixing. The optimal configuration—60° inlet angle, 10 mm chamber radius, and 8 Hz, 3 mm wall oscillation—achieves a 92% mixing index at Re = 825, a 58% improvement over the base T-mixer. Estimated Nusselt numbers range from 9.2 to 13.8, with friction coefficients of 0.42-0.52. All configurations reach steady mixing within 6 seconds. These findings provide valuable insights for designing high-efficiency active micromixers for microfluidic applications requiring rapid homogenization of non-isothermal fluids. | ||
| کلیدواژهها | ||
| Active micromixer؛ Fluid-structure interaction؛ oscillating wall؛ Mixing chamber؛ Laminar flow | ||
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