Download or read book Impulsive Solid-particle Jet Formation in a Hele-Shaw Cell written by Revanth Kotha and published by . This book was released on 2019 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of solid-particle jet formation is observed under and wide array of circumstances such as explosive volcanic eruption, following the detonation of explosive charges surrounded by particles, or also on impact of solid projectile on granular media. This solid-particle jet formation occurs due to the interaction of granular media with an impulsive pressure load like shock and blast-waves. During this interaction, the solid particles are impulsively dispersed by the pressure load and develop a spatial distribution resulting in the formation of these particle jets. The physical mechanism of particle jetting appears to be driven by two phenomenon: the driver gas jets induced by the shock-wave through the initial particle layer and the inelastic collisions between the particles. Research has shown that this jetting is influenced by the particles’ properties as well as the relation between the strength of the initial impulse and the initial particle layer mass. Still, the physical mechanism of the particle jet selection has not been fully identified. The aim of our current work is to computationally study this particle dispersal with fingering effects, in a quasi-two-dimensional setup. In the current computational study, a blast-wave is initialized in the carrier gas in the center of a Hele-Shaw cell around which a granular medium ring is place. This blast-wave accelerates from the inner-side of the granular medium ring. The impulsive interaction between the particles and the blast-wave causes the particles to disperse and form the particle jets. Experiments have observed that these jets were initially generated in the interior of the particle ring where the ring first comes in contact with the shock-wave and these internally formed jets were later expelled outwards to from the visible outward jets. They have also found small perturbations around the external and internal surfaces of the particle ring prior to the formation of particle jets. In this work, multiple computations were performed to study the formation of internal particle perturbations, external particle perturbations, internal particle jets and external particle jets. We also focus our attention on explaining the coalescence of the particle jets observed during the later stages of the experiment and on the prediction of the particle jet selection mechanism. Also investigated are the influences of material properties, particle ring geometry, the initial over-pressure, and the initial volume fraction distribution, on the jets formed and also on the number of particle jets.