Experimental investigation on the properties of liquid film breakup induced by shock waves*

Abstract

We experimentally observed properties of liquid film breakup for shock-wave-initiated disturbances in air at normal temperature and pressure. The tested liquids include water and various glycerol mixtures. High speed camera and multiple-spark high speed camera were utilized to record the process of liquid film breakup. A phase Doppler particle analyzer was also used to record droplet size and velocity. The experimental results show that liquid viscosity plays a vital role in the deformation, breakup and atomization of liquid films. After the interaction of shock waves, the droplet size of various glycerol mixtures is significantly smaller than either water or glycerol. Richtmyer–Meshkov instability is an important factor in the breakup and atomization of liquid films induced by shock waves. Furthermore, a dispersal model is established to study breakup mechanisms of liquid films. The correlation between droplet size and velocity is revealed quantitatively. The research results may provide improved understanding of breakup mechanisms of liquid films, and have important implications for many fields, especially for heterogeneous detonations of gas/liquid mixtures.

Experimental Study on the Influence of Water Barrier Placement Position on Shock Wave Pressure Peak

“…This is because during the interaction between the shock wave and the water barrier, part of the energy of the shock wave is absorbed by the water barrier, and part of it forms a reflected wave that moves backward. No transmitted shock wave is formed behind the water barrier, so there is no step-up curve; the water barrier will form an aerosol cloud driven by the airflow behind the shock wave [10], and the pressure curves of measuring points p3 and p4 are the dynamic pressure curves of the aerosol cloud formed by the water barrier driven by the high-speed airflow after the shock wave. Comparing working conditions 1, 3, and 5 with experimental conditions 2, 4, and 6, it can be found that when the incident shock wave is Mach 1.6 and the water barrier thickness is 2 mm, the pressure peak when there is a water barrier seriously lags behind the overpressure peak under the condition of no water barrier.…”

Analytical determination of non-local parameter value to investigate the axial buckling of nanoshells affected by the passing nanofluids and their velocities considering various modified cylindrical shell theories

“…Plates and shells are the most widely used tools in industrial and manufacturing applications. With the advancement of technology, applications of these devices in various fields, especially in micro and nano scales of such as micro/nano-electromechanical systems, [1][2][3][4][5] nano-mechanical and biological sensors, [6,7] fluidic transfer devices in medical laboratories, [8,9] are indisputable. Therefore, the studies of mechanical behaviors such as bending, [10] buckling, [11] vibration, [12] and wave propagation, [13] have been highly regarded by researchers in various fields.…”

Viewing the noise propagation mechanism in a unidirectional transition cascade from the perspective of stability*

“…[30] The instability of Richtmyer-Meshkov is a key factor in the rupture and atomization of liquid films caused by shock waves. [31] Recently, stability analysis has become a hot and promising research topic. [32] It can provide some suggestions not only for the control of rumor propagation or virus transmission, but also for the clinical treatment of diseases.…”