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<p>This work focuses on enhancing mixing in passive U-turn micromixers. Microchannels with three different U-turn geometries namely curved, rectangular, and triangular shapes were examined. The effects of the number of mixing units and the design of U-turn geometries on mixing behaviour were analysed for Reynolds numbers between 0.1 and 60. The microchannels with different U‑turn shapes and fixed axial lengths of 6.8&#xa0;mm, 8.4&#xa0;mm, and 10.0&#xa0;mm were investigated. Mass concentration plots on the x–y and y–z planes at various axial positions were analyzed to provide detailed insights into the mixing behavior and underlying mechanisms. At low Reynolds numbers (Re &lt; 5), mixing is dominated by diffusion; above Re = 5, secondary flows and chaotic advection become the main mechanisms. The microchannel with rectangular-shaped U-turn showed better performance for Re &gt; 5.</p>

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Analysis of flow and mixing intensification in a U-turn micromixer

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Harshwardhan R. Gidde,
  • Ranjitsinha R. Gidde,
  • Amarjit P. Kene

摘要

This work focuses on enhancing mixing in passive U-turn micromixers. Microchannels with three different U-turn geometries namely curved, rectangular, and triangular shapes were examined. The effects of the number of mixing units and the design of U-turn geometries on mixing behaviour were analysed for Reynolds numbers between 0.1 and 60. The microchannels with different U‑turn shapes and fixed axial lengths of 6.8 mm, 8.4 mm, and 10.0 mm were investigated. Mass concentration plots on the x–y and y–z planes at various axial positions were analyzed to provide detailed insights into the mixing behavior and underlying mechanisms. At low Reynolds numbers (Re < 5), mixing is dominated by diffusion; above Re = 5, secondary flows and chaotic advection become the main mechanisms. The microchannel with rectangular-shaped U-turn showed better performance for Re > 5.