Dynamic Interfacial Behavior of A Dielectric Liquid Drop in AC Electric Field

• Main Authors: Wang, Yih-Ching, 王奕晴
• Other Authors: Yeh, J. Andrew
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/07967537883664904143

碩士 === 國立清華大學 === 動力機械工程學系 === 98 === This research focus on a sessile dielectric drop immersed in an another dielectric liquid. The sessile drop and environment liquid are silicone oil and alcohol-mixture separately. By input ac electrical signal to patterned concentric electrode under the sessile drop, the drop oscillated periodically due to induced time-varying electric force concentrated on the vicinity of contact line. And the drop oscillation wave pattern on liquid interface was generated. The experimental results showed that the interface pattern highly depends on input signal frequency. And the nodes and antinodes appeared on the interface simultaneously during the drop oscillation. The fixed number of nodes and antinodes indicated that the same oscillation mode was be excited. As input frequency increased from 5 to 90 Hz, 2, 4 and 6 nodes were excited continually. In addition, resonance was not observed in our dielectric liquid system. The large damping ratio and axisymmetric electric field might result in it.