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<p>This study investigates the influence of pulsed bubbly electrolyte flow on electrochemical machining (ECM) performance, aiming to address the trade-off between enhanced flow and reduced conductivity associated with conventional continuous gas-mixing methods. Gas bubbles are known to improve electrolyte renewal and byproduct removal; however, excessive gas content reduces effective conductivity and may lead to machining instability. To mitigate this limitation, a pulsed bubble-flow generation system was developed to temporally modulate gas distribution within the electrolyte. A series of experiments was conducted in three stages: ECM with non-aerated electrolyte, ECM with continuous gas mixing under different gas-mixing currents, and ECM with pulsed bubbly flow at various frequencies while maintaining a constant total gas input. Machining characteristics including feature geometry, depth, and bottom surface roughness were evaluated. Computational fluid dynamics (CFD) simulations were performed to analyze flow behavior in the machining gap, and fixed-gap experiments were used to assess polarization effects. Results indicate that an appropriate level of gas mixing enhances machining depth due to increased flow velocity, whereas excessive gas content reduces performance due to conductivity loss. Under the present experimental conditions, pulsed bubbly flow demonstrated improved machining characteristics compared to the selected continuous gas-mixing condition, although direct comparison is limited due to differences in machining parameters. A pulse frequency of 15&#xa0;Hz resulted in the maximum machining depth and feature width, while the lowest surface roughness was observed at 35&#xa0;Hz, with a maximum reduction of approximately 14%. Fixed-gap experiments showed that gas mixing reduced inter-electrode impedance by up to 29.9%, confirming its role in mitigating polarization through enhanced flow. These results suggest that pulsed bubbly electrolytes provide a promising approach for balancing flow enhancement and conductivity preservation in ECM, contributing to improved machining stability and performance.</p>

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Frequency-modulated bubbly electrolyte flow for balancing conductivity and flow enhancement in electrochemical machining

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Po-Jen Yang,
  • Jung-Chou Hung

摘要

This study investigates the influence of pulsed bubbly electrolyte flow on electrochemical machining (ECM) performance, aiming to address the trade-off between enhanced flow and reduced conductivity associated with conventional continuous gas-mixing methods. Gas bubbles are known to improve electrolyte renewal and byproduct removal; however, excessive gas content reduces effective conductivity and may lead to machining instability. To mitigate this limitation, a pulsed bubble-flow generation system was developed to temporally modulate gas distribution within the electrolyte. A series of experiments was conducted in three stages: ECM with non-aerated electrolyte, ECM with continuous gas mixing under different gas-mixing currents, and ECM with pulsed bubbly flow at various frequencies while maintaining a constant total gas input. Machining characteristics including feature geometry, depth, and bottom surface roughness were evaluated. Computational fluid dynamics (CFD) simulations were performed to analyze flow behavior in the machining gap, and fixed-gap experiments were used to assess polarization effects. Results indicate that an appropriate level of gas mixing enhances machining depth due to increased flow velocity, whereas excessive gas content reduces performance due to conductivity loss. Under the present experimental conditions, pulsed bubbly flow demonstrated improved machining characteristics compared to the selected continuous gas-mixing condition, although direct comparison is limited due to differences in machining parameters. A pulse frequency of 15 Hz resulted in the maximum machining depth and feature width, while the lowest surface roughness was observed at 35 Hz, with a maximum reduction of approximately 14%. Fixed-gap experiments showed that gas mixing reduced inter-electrode impedance by up to 29.9%, confirming its role in mitigating polarization through enhanced flow. These results suggest that pulsed bubbly electrolytes provide a promising approach for balancing flow enhancement and conductivity preservation in ECM, contributing to improved machining stability and performance.