Ultra-High Speed Particle Image Velocimetry on Drop-on-Demand Jetting
Castrejon Pita, Alfonso Arturo
Proc 27th Int. Conf. on Digital Printing Technologies NIP27
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Castrejon-Pita, J., Hoath, S., Castrejon Pita, A. A., Morrison, N., Hsiao, K., & Hutchings, I. (2011). Ultra-High Speed Particle Image Velocimetry on Drop-on-Demand Jetting. http://www.dspace.cam.ac.uk/handle/1810/239165
An experimental setup to study the dynamics of droplet jetting from a commercially available print-head is described. A MicroFab print-head with an 80 µm diameter transparent nozzle was set to print droplets at a speed of 5 m/s at a frequency of 7 kHz. A Particle Image Velocimetry (PIV) scheme consisting of an optical microscope coupled to an ultra-high speed camera is utilized to capture the motion of particles suspended in a model transparent ink. This experimental arrangement images the flow at the centre of a glass cylindrical nozzle and above the fluid meniscus at a speed of half a million frames per second. Velocity fields are obtained from an approximately 200 µm thickness layer of fluid at the inside of the nozzle. Experimental results are compared with Lagrangian finite-element numerical simulations under identical fluid and jetting conditions with good agreement. The advantages, challenges and current limitations of this approach are discussed.
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