1. Experimental study on electrohydrodynamic atomization (EHDA) in stable cone-jet with middle viscous and low conductive liquid.
- Author
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Wang, Qisi, Wang, Zhentao, Yang, Shiqi, Li, Bin, Xu, Huibin, Yu, Kai, and Wang, Junfeng
- Subjects
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CONES , *TRANSITION flow , *ATOMIZATION , *ELECTRIC potential , *POTENTIAL flow , *MASS transfer coefficients - Abstract
• The stable cone-jet occurs in a certain range of electric potential and flow rate. • The electrified meniscus forms appears successively convex, linear sides and concave with an increase in electric potential. • The jet breakup transits from varicose to kink instability with an increase in flow rate. The cone-jet is one of the most interesting means in electrohydrodynamic atomization (EHDA) for wide applications because of highly charged and monodisperse drops. The pulsating and stable cone-jet modes in EHDA of diethyleneglycol (DEG) are observed by means of high-speed photography technology, as well as the breakup modes transition of electrified jet from varicose to kink instability. The conductive liquid is driven to form a liquid cone at the outlet of the capillary tube, and form a permanent jet from the apex of the cone by the tangential electric stress. With an increase in electric potential, the cone angle and jet length increase. The electrified meniscus and the cone may appear convex, linear sides and concave in cone jet regime, which depends on the static equilibrium of forces exists at each point of electrified liquid surface. The jet breakup modes with multi-jet, varicose and kink instabilities are successively recorded as liquid flow rates increasing. The jet breakup transition depends on flow rate. The drops size rises proportionally with an increase in liquid flow rate or a decrease in electric potential in stable cone-jet mode. The dimensionless diameter d / d 0 as a function of the dimensionless flow rate q V / q m is in good agreement with the universal scaling laws. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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