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<p>A visualized experimental study was conducted to elucidate multiscale bubble dynamics in a biomimetic leaf-inspired flow channel during alkaline water electrolysis. Using high-speed imaging, bubble behaviors across hierarchical channels and on the nickel mesh electrode were quantitatively analyzed. The results reveal a synergistic function among channels: the main channel drives fluid circulation and bubble discharge, the secondary channel transports large coalesced bubbles, and the refined channel promotes bubble growth and merging. As the electrolyte temperature increased from 40 to 80&#xa0;°C, the average bubble velocity rose from 0.50 to 0.84&#xa0;µm·s<sup>−1</sup>, while the mean detachment time decreased from 35 to 8&#xa0;s. The detachment diameter converged near 300&#xa0;µm. These results indicate that elevated temperatures reduce viscosity and surface tension, accelerating bubble evolution and homogenizing detachment. The hierarchical biomimetic flow channel enhances gas evacuation, providing quantitative insights for optimizing mass transfer and structural design in high-efficiency alkaline electrolyzers.</p>

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Visualization of bubble dynamics in biomimetic leaf-inspired flow channels during alkaline water electrolysis

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Ziqing Wang,
  • Ying Wang,
  • Luhaibo Zhao,
  • Qianqian Chen,
  • Zhiyong Tang

摘要

A visualized experimental study was conducted to elucidate multiscale bubble dynamics in a biomimetic leaf-inspired flow channel during alkaline water electrolysis. Using high-speed imaging, bubble behaviors across hierarchical channels and on the nickel mesh electrode were quantitatively analyzed. The results reveal a synergistic function among channels: the main channel drives fluid circulation and bubble discharge, the secondary channel transports large coalesced bubbles, and the refined channel promotes bubble growth and merging. As the electrolyte temperature increased from 40 to 80 °C, the average bubble velocity rose from 0.50 to 0.84 µm·s−1, while the mean detachment time decreased from 35 to 8 s. The detachment diameter converged near 300 µm. These results indicate that elevated temperatures reduce viscosity and surface tension, accelerating bubble evolution and homogenizing detachment. The hierarchical biomimetic flow channel enhances gas evacuation, providing quantitative insights for optimizing mass transfer and structural design in high-efficiency alkaline electrolyzers.