CUED Publications database

Time-resolved particle image velocimetry within the nozzle of a drop-on-demand printhead

Castrejón-Pita, JR and Hoath, SD and Castrejón-Pita, AA and Morrison, NF and Hsiao, WK and Hutchings, IM (2012) Time-resolved particle image velocimetry within the nozzle of a drop-on-demand printhead. Journal of Imaging Science and Technology, 56. ISSN 1062-3701

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Time-resolved particle image velocimetry (PIV) has been performed inside the nozzle of a commercially available inkjet print-head to obtain the time-dependent velocity waveform. A printhead with a single transparent nozzle 80 μm in orifice diameter was used to eject single droplets at a speed of 5 m/s. An optical microscope was used with an ultra-high-speed camera to capture the motion of particles suspended in a transparent liquid at the center of the nozzle and above the fluid meniscus at a rate of half a million frames per second. Time-resolved velocity fields were obtained from a fluid layer approximately 200 μm thick within the nozzle for a complete jetting cycle. A Lagrangian finite-element numerical model with experimental measurements as inputs was used to predict the meniscus movement. The model predictions showed good agreement with the experimental results. This work provides the first experimental verification of physical models and numerical simulations of flows within a drop-on-demand nozzle. © 2012 Society for Imaging Science and Technology.

Item Type: Article
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 02 Sep 2016 16:18
Last Modified: 27 Oct 2016 02:40