Abstract
Air-flow oscillations in inkjet print-zones give rise to undesirable print defects due to misplacement of low Stokes number satellite droplets. The problem is studied numerically using a novel body-force approach which averages the entrainment, due to the multitude of high Stokes number main droplets, over the print-zone volume. The instability seems to occur because of deformation of the primary vortex upstream of the print-zone. It is also shown that introducing extra flow in the direction of the paper motion is an effective remedy for the oscillations.
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