摘要
分析微凹坑、疏水涂层及电解规范对于微气泡生长行为及驻留稳定性的影响和作用机制,实现自适应电解微气泡启停控制及稳定驻留。制备壁面聚酰亚胺绝缘涂层底面Pt电极微凹坑电解试片,进行普通及疏水壁面电解微气泡静水观测试验。研究结果表明:电解试片可实现电解微气泡启停控制及稳定驻留;电解微气泡从形核位点开始生长,疏水壁面可形成更多形核位点,促进微气泡生长;NaCl浓度由0.5%增大至3.5%时,普通及疏水壁面微气泡起始反应电压分别减小约4.43%、2.31%;NaCl浓度由0.5%增大至2.5%时普通及疏水壁面微气泡充溢微凹坑电压减小,NaCl浓度大于2.5%时微气泡充溢微凹坑电压趋于稳定值;增大电解电压直接高效促进氢离子与电子结合,显著加速电解微气泡生长至稳定直径;相同试验参数下,疏水壁面可形成较大微气泡稳定直径,缩短达到稳定直径时间,增大接触角从而提升微气泡驻留稳定性。
The influences of micro-pits,hydrophobic coating and electrolysis specifications on the growth behaviors and resident stability of the electrolyzed microbubbles are analyzed to achieve the adaptive start-stop control and stable residence of electrolyzed microbubble.The electrolytic test pieces with polyimide insulation surface and Pt bottom electrode were manufactured,and the observational experiments of electrolyzed microbubbles with normal and hydrophobic wall surfaces in the static water were made.The research results show that the adaptive start-stop control and stable residence of electrolyzed microbubbles in the micro-pits on electrolytic test piece can be achieved.The electrolyzed microbubbles start generating at the nucleation points,and more nucleation points are formed on the hydrophobic surface to accelerate the microbubble growth.The increased NaCl concentration from 0.5%to 3.5%would reduce the voltages of starting microbubble electrolysis on normal and hydrophobic wall surfaces by 4.43%and 2.31%,respectively.The increased NaCl concentration from 0.5%to 2.5%would also reduce the voltages of filling micro-pits on normal and hydrophobic wall surfaces,but the voltages of filling micro-pits turn to be constant as the NaCl concentration is greater than 2.5%.The electrolytic voltage is increased to directly stimulate the combinations of H ions and electrons,thus significantly accelerating the electrolyzed microbubbles to inflate to the stable diameter.Under the same experimental conditions,the hydrophobic surface would lead to the greater stable diameter of microbubble to shorten the time to reach the stable diameter,and the resident stability of microbubble is improved using a greater contact angleθ.
作者
朱睿
庄启彬
李尚
张子捷
张焕彬
温潍齐
刘志荣
吴德志
ZHU Rui;ZHUANG Qibin;LI Shang;ZHANG Zijie;ZHANG Huanbin;WEN Weiqi;LIU Zhirong;WU Dezhi(School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2021年第5期1023-1031,共9页
Acta Armamentarii
基金
装备预先研究教育部联合基金项目(6141A02033529)
装备“十三五”预先研究领域基金项目(61402060405)。
关键词
微气泡
电解
形核位点
疏水
接触角
驻留稳定性
microbubble
electrolysis
nucleation point
hydrophobicity
contact angle
resident stability
作者简介
朱睿(1980—),男,副研究员,博士,E-mail:zhurui@xmu.edu.cn。
