Evaporation and breakup effects in the shock-driven multiphase instability

Abstract

Abstract

RETRACTED: Droplet Breakup and Evaporation in Liquid-Fueled Detonations

“…The first was the theoretical based KH-RT model [24], a combination of continuous Kelvin-Helmholtz surface stripping and Rayleigh-Taylor bulk breakup. The second was the semi-empirical Wert49 model presented in [25], based on [26] with modifications using data from [27][28][29]. Thermophysical properties were calculated from available NIST values and the NASA7 polynomial tables [30].…”

A Consistent Volume-of-Fluid Approach for Direct Numerical Simulation of the Aerodynamic Breakup of a Vaporizing Drop

“…The liquid and vapor properties are provided in stream gas velocity, pressure, and temperature are U ∞ = 214.4 m/s, p ∞ = 285 kPa, and T ∞ = 402 K, respectively. These parameters are chosen to be similar to the post-shock conditions for a planar shock wave with Mach number 1.6, inspired by the shock tube experiment of Duke-Walker et al [48], though the present simulation has neglected the effects of shock-drop interaction and compressibility. A 3D simulation is performed in this case and Fig.…”

“…In practical spray applications, due to the large geometric scale and the huge number of drops involved, it is inviable to resolve the interface of each individual drop. For those macro-scale simulations, the Euler-Lagrange point-particle simulations are typically used [48,49,50,51]. Since the drop-scale interfacial and flow physics are not resolved, the mass and energy transfer between the drop and the surrounding gas must be represented by sub-grid models, similar to the drag model for momentum transfer [52,53].…”

Shock-induced interfacial instabilities of granular media

“…These instabilities have a fundamental bearing on a range of natural phenomena and engineering processes, particularly supernova explosions (Inoue, Yamazaki & Inutsuka 2009), volcanic eruptions (Formenti, Druitt & Kelfoun 2003) and laser-driven inertial confinement fusion experiments (Aglitskiy et al 2010). The resulting particle fingers protruding into gases, reminiscent of the heavy-fluid ‘spikes’ thrusting into a light fluid generated by the conventional Richtmyer–Meshkov instability (RMI) (Luo et al 2019; Li et al 2020; Zhang et al 2020; Zhou et al 2021), inspire investigators to draw a parallel between the shock-driven particle jetting behaviour and the RMI (Vorobieff et al 2011; McFarland et al 2016; Osnes, Vartdal & Pettersson Reif 2017; Fernández-Godino et al 2019; Koneru et al 2020; Duke-Walker et al 2021). Indeed, the shock-driven multiphase instability (SDMI), a variant of the RMI arising from the shock-accelerated perturbed interface between multiphase fluid mixtures of different effective densities, is responsible for the jetting instability of particles that have been explosively dispersed and mixed with gases (Osnes et al 2017; Fernández-Godino et al 2019; Koneru et al 2020).…”

“…During SDMI evolution, the equilibration time between particles and gases is shorter than the characteristic hydrodynamic time scale; therefore, a quite low particle volume fraction, normally ϕ p < 1 %, is required (McFarland et al 2016; Duke-Walker et al 2021). Evidently, this is not the case for the interfacial instabilities of dense granular media observed in experiments where the shock-loaded particles remain closely packed (Rodriguez et al 2013; Kandan et al 2017; Xue et al 2018, 2020).…”