Abstract:Needle-free jet injections are actuated by a pressure impulse that can be delivered by different mechanisms, and the resultant jets are O(10^2) m/s. Here, we report on the effect of entrapped air bubbles since filling procedures for pre-filled ampoules can induce bubbles, especially for viscous fluids. We use spring-piston devices as the principal actuation mechanism and vary both the location and size of the initial bubble. We find that the bubble location does have a statistically significant (p<0.05) e… Show more
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