Calculation and measurement of the velocity of a jet from a triangular groove

In micro-jetting modeling, it is important to know the velocity and density of the jet. This is particularly the case for the development of jet fragmentation models, such as the FZP model proposed a few years ago in the literature [J. Appl. Phys., 117,165903 (2015)]. An extension of the Birkhoff's model, called BMPT-2, has recently been proposed. This model allows the calculation of the speed of the jet and its density provided that the solution is known. BMPT-2 leads to a satisfactory agreement with the results of classical molecular dynamics simulations. In order to go further, a series of plates impact experiments were done in which the velocities of jets from triangular grooves of tin targets were accurately measured by PDV. The comparison of BMPT-2 with these experimental results is very satisfactory and the agreement is much better than with the original Birkhoff’ model, or with a model derived from the Richtmyer-Meshkov instabilities theory. In addition to the jet velocity, BMPT-2 provides its density. The calculation shows that it is much lower than the density of the material at rest.