ID 427

Experimental Study on Bubble Dispersion in Ethanol under Different Electric Fields

 

Abstract:

The electrostatic dispersion of air bubbles in ethanol was investigated in this paper. Different electric fields were taking into account to find an optimal solution. The high-speed video camera was used to capture the bubbles’ micro appearance and dispersion modes. Different dispersion modes were observed and the tran-sition of dispersion modes was closely related to the applied voltage. With the increase of applied voltage, dispersion modes appeared by dripping mode, mixed mode, spraying mode and corona mode. Different capil-lary configurations could provide different electric fields, having great influence on voltage range of each dis-persion mode. The bubble size had significant differences at different dispersion modes. At dripping mode, the bubble size was in the same order to capillary diameter and bubble growth frequency was stable. At spraying mode, microbubbles with diameter less than 50 μm can be generated stably, which greatly increase the gas-liquid two-phase superficial area. At corona mode, air was ionized and bubbles were even larger than bubbles without electric field was generated.