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Massively Multiplexed Electrohydrodynamic Tip Streaming from a Thin Disc.

Z Wang¹, Y Tian¹, C Zhang¹

¹Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Ave., Shenzhen 518055, China.

Physical Review Letters

|February 26, 2021

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Thin discs in electric fields generate multiple liquid ligaments and cone jets. This electrohydrodynamic phenomenon, driven by interfacial instability, creates fine liquid streams with precise spacing.

Area of Science:

Fluid dynamics
Electrokinetics
Interfacial phenomena

Background:

Electric fields can induce instabilities at liquid-air interfaces.
Tip streaming is a phenomenon where fine jets emerge from a liquid surface under electric stress.

Purpose of the Study:

To experimentally investigate multiple tip streaming from a wetted thin disc in electric fields.
To understand the mechanism of ligament formation and spacing.

Main Methods:

An experimental setup involving an externally wetted thin disc subjected to electric fields.
Observation and analysis of liquid ligament formation at the disc rim.
Investigation of scaling laws for ligament wave number.

Main Results:

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Electrohydrodynamic stress causes interfacial instability, forming multiple radial liquid ligaments.
Ligament spacing is inversely proportional to the square of the peak electric field.
A 1 cm diameter disc generated over 1000 cone jets with spacing as small as 30 μm for ethanol.

Conclusions:

The thin disc edge effectively intensifies the electric field, enabling multiple tip streaming.
The study provides insights into controlling fine liquid stream generation using electric fields and geometry.