Browsing by Author "Peters, Ivo R."
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Item Highly focused supersonic microjets(Physical Review X, 7/9/2012) Tagawa, Yoshikuyi; Oudalov, Nikolai; Visser, Claas Willem; Peters, Ivo R.; van der Meer, Devaraj; Sun, Chao; Prosperetti, Andrea; Lohse, DetlefThis paper describes the production of thin, focused microjets with velocities of up to 850 m/s by the rapid vaporization of a small mass of liquid in an open liquid-filled capillary. The vaporization is caused by the absorption of a low-energy laser pulse. A likely explanation of the observed phenomenon is based on the impingement of the shock wave caused by the nearly instantaneous vaporization on the free surface of the liquid. We conduct an experimental study of the dependence of the jet velocity on several parameters and develop a semiempirical relation for its prediction. The coherence of the jets and their high velocity, good reproducibility, and controllability are unique features of the system. A possible application is to development of needle-free drug-injection systems that would be of great importance for health care worldwide.Item Highly focused supersonic microjets: numerical simulations(Journal of Fluid Mechanics, 9/28/2012) Peters, Ivo R.; Tagawa, Yoshikuyi; Oudalov, Nikolai; Sun, Chao; Prosperetti, Andrea; Lohse, Detlef; van der Meer, DevarajBy focusing a laser pulse inside a capillary partially filled with liquid, a vapour bubble is created which emits a pressure wave. This pressure wave travels through the liquid and creates a fast, focused axisymmetric microjet when it is reflected at the meniscus. We numerically investigate the formation of this microjet using axisymmetric boundaryintegral simulations, where we model the pressure wave as a pressure pulse applied on the bubble. We find a good agreement between the simulations and experimental results in terms of the time evolution of the jet and on all parameters that can be compared directly. We present a simple analytical model that accurately predicts the velocity of the jet after the pressure pulse and its maximum velocity.