Evaporation and Break-up effect in a Shock Driven Multiphase Instability

 

New experimental equipment, methodologists and techniques are utilized on the investigation of the impulsive acceleration of a heterogeneous multiphase flow-field within a shock tube system. A remodel diaphragm loader was built to withstand higher shocks speed and a new equipment was designed to create an uniform curtain (2 in x 0.5 in) multiphase interface. The interface mixture is compressing of nitrogen (carrier gas), and micro-sized acetone droplet, generated inside the shock tube’s test section. Nitrogen gas is pre-saturated with acetone vapor prior entering the test section. Acetone vapor will trace the interface morphology and prevent premature evaporation of the particle droplets. Droplets size and distribution are validated utilizing a Phase Doppler Particle Analyzer (PDPA). The multiphase interface is then impulsively accelerated by a planar shock wave. The development of the interface was captured through a series of Planar Laser Mie Scattering and Planar Laser-Induced Fluorescence images, respectively. Results of these experiments were compared against evaporation measurements with models like the D-Square-Law, breakup and simulations. Importantly, this study has a multitude of applications in multiple scientific and engineering systems; with significance importance on high-speed or shock-induced multiphase combustion.