CUED Publications database

Interaction of sequential pulsed electrohydrodynamic jets in drop-on-demand printing

Chen, CH and Martin, GD and Hutchings, IM (2016) Interaction of sequential pulsed electrohydrodynamic jets in drop-on-demand printing. In: UNSPECIFIED pp. 71-74..

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© 2016 Society for Imaging Science and Technology. A method is demonstrated for studying hydrodynamic effects in pulsed electrohydrodynamic (EHD) jetting, for the drop-on-demand printing of small droplets. The transient behaviour of pulsed EHD jets and the deposition of liquid on to a substrate were investigated by using an ultra-high speed camera (Shimadzu HPV-1) with a Newtonian aqueous liquid (water-glycerol). Time-resolved images of jets induced by two consecutive voltage pulses, with different time delays, were captured. Image analysis was used to determine the jet length, meniscus radius at the nozzle, and deposit volume in each case and revealed that the behaviour of an EHD jet depends strongly on the delay time after a previous ejection event. The effect originates in the time taken for the meniscus shape and position to recover to their equilibrium values and plays a critical role in the design of printing strategies for EHD drop-on-demand applications. It is possible that the maximum printing frequency achievable by pulsed EHD jetting can be increased by optimizing the drive waveform in order to accelerate recovery of the meniscus position.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 25 Jul 2017 03:54
Last Modified: 22 May 2018 08:16