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<p>This study numerically compares the performance of classical and proposed models used in electrokinetic microfluidic systems using the Carreau–Yasuda fluid model. The time-dependent behavior of electroosmotic flow in a microchannel is investigated by solving the Poisson–Boltzmann and Nernst–Planck equations using the finite difference method. The proposed model, based on the Helmholtz–Smoluchowski theory, is used to determine the electrical potential distribution and viscoelastic properties of the fluid. The results show that the Carreau–Yasuda model provides a significant improvement in ion transport; ions are guided with sharper concentration profiles, under reduced diffusion effects, and in shorter time. It shows near 30% enhanced ion transfer rate over a traditional device and reveals an outstanding performance in sensitive ion separation. In addition, the enhanced electrical boundary conditions of electrokinetic gate systems foster a reliable and repeatable analysis environment for microchip applications.</p>

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Comparative analysis and numerical simulation of Carreau–Yasuda fluid models in electrokinetic microfluidic systems

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Mansur Mustafaoğlu,
  • Abdüssamed Kabakuş,
  • Merve Acar

摘要

This study numerically compares the performance of classical and proposed models used in electrokinetic microfluidic systems using the Carreau–Yasuda fluid model. The time-dependent behavior of electroosmotic flow in a microchannel is investigated by solving the Poisson–Boltzmann and Nernst–Planck equations using the finite difference method. The proposed model, based on the Helmholtz–Smoluchowski theory, is used to determine the electrical potential distribution and viscoelastic properties of the fluid. The results show that the Carreau–Yasuda model provides a significant improvement in ion transport; ions are guided with sharper concentration profiles, under reduced diffusion effects, and in shorter time. It shows near 30% enhanced ion transfer rate over a traditional device and reveals an outstanding performance in sensitive ion separation. In addition, the enhanced electrical boundary conditions of electrokinetic gate systems foster a reliable and repeatable analysis environment for microchip applications.