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Bubble dynamics in capillary-grid plate electrode system under non-uniform electric field
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DOI：10.1016/j.ijmultiphaseflow.2026.105706.png)
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Abstract
En 中文
Electric dispersion is a novel and promising method for bubble dispersion. In this study, a non-uniform electric field was established using a capillary-grid plate electrode configuration within a nitrogen-biodiesel system. Bubble dynamics were investigated via high-speed camera under both single and double capillaries setups. The results showed that the electric field markedly enhanced bubble dispersion in the single-capillary system, reducing departure diameter from 1.9 mm to 0.6 mm and increasing departure frequency from 20 Hz to 700 Hz with the electrical Bond number (BoE) raised to 10.38. Moreover, compared to a conventional cylinder electrode, the grid plate electrode significantly improved dispersion stability by suppressing coalescence and promoting monodisperse bubble chains through its enhanced vertical field component. In the double capillaries system, highly synchronized bubble generation was achieved with uniform size and stable double-chain formation. The resulting bubble clusters followed a Gaussian distribution. As BoE increases, the size of the charged bubble clusters significantly decreased, and the number density noticeably increased from 2.5 & times; 105 to 2.5 & times; 107 N/m3, while gas flow rate had minimal influence. Additionally, a predictive model for mean bubble size was adopted and developed with good accuracy, showing less than 15% relative error. The results confirmed capillary-grid plate electrode is a promising method for controllable and scalable bubble dispersion with multi-capillary distributor systems.
Keywords:
Electric dispersion
Non-uniform electric field
Double capillaries
Bubble cluster
Model
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