Breakup of a liquid drop suddenly exposed to a high-speed airstream

CFD of Complex Three-Dimensional Multiphase Flowfields

“…Figure 3.4 shows the Eulerian cloud of particulates which forms a trail behind the pellet. Very high particle densities are observed near the drop shoulder and the back of the drop, in qualitative accord with photographs of shock wave / drop interactions in shock tubes [20]. The drop size distributions are also in qualitative accord with experimental observations of drop shattering.…”

“…The shapes predicted appear to be in qualitative accord with those exhibited in laboratory studies at the University of Minnesota [20], and the relatively fast rate of breakup under these conditions appears to be in nominal accord with gross observations from the AEDC tests. In particular, Fig.…”

“…As a result of these interactions, both at the front and back of the blob, lower-density fluid (gas) is accelerated into higher-density fluid (liquid), raising the potential for Rayleigh-Taylor instabilities to set in and act as a driver for blob breakup. It is interesting to note that Joseph et al [20] have already alluded to such a possibility based on their experimental results. These results indicate that, in absence of surface primary breakup modeling, the large mass of fluid which rolls up above the blob would tend to break away from the blob.…”

Comparison-speed liquid jets

“…This shows the role of the CU method in the liquid disintegration and atomization. The disruption on each jet front is associated with the Rayleigh-Taylor instability (Joseph et al 1999;Field and Lesser 1977). The schlieren photographs show the complicated shock waves system induced by the jet.…”

Viscous potential flow analysis of magnetohydrodynamic Rayleigh–Taylor instability with heat and mass transfer

“…We include normal stress for calculating this pressure difference and the viscosity enters through the normal stress balance (Joseph and Liao [8]). Joseph et al [9] considered the viscous potential flow analysis of Rayleigh-Taylor instability and observed that the most dangerous wave is the one whose length gives the maximum growth rate. Funada and Joseph [10] used the viscous potential flow theory to study the Kelvin-Helmholtz instability in a channel and found that the stability criterion for viscous potential flow is given by the critical value of the relative velocity.…”