Dynamics of entrained air bubbles inside a piezodriven inkjet printhead

Sang Joon Lee; Dae Hee Kwon; Yong Seok Choi
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p221902
Academic Journal
Entrained air bubbles inside a piezoelectric inkjet printhead cause a malfunction in the droplet formation and deteriorate the reliability of inkjet printing. The dynamic motion of the entrained air bubbles is investigated optically by utilizing a high-speed imaging system. Air bubbles, ingested through the inkjet nozzle, are surrounded by a pulsating pressure field inside the inkjet printhead. The bubbles oscillate and move along the inner wall of the printhead as they are subjected to the Bjerknes force. As the bubbles attract each other, they continuously coalesce and grow due to rectified diffusion until they reach the equilibrium condition.


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