The temporal characteristics of the Xe ion axial Velocity Distribution Function (VDF) were recorded in the course of low-frequency discharge current oscillations (∼ 14kHz) of the 5 kW-class PPSrX000 Hall thruster. The evolution in time of the ion axial velocity component is monitored by means of a laser induced fluorescence diagnostic tool with a time resolution of 100ns. As the number of fluor...

In this work, CFD simulations of an air-water bubbling column were performed and validated with experimental data. The superficial gas velocities used for the experiments were 0.019 and 0.038 m/s and were considered as an homogeneous regime. The former involves simpler physics when compared to a heterogeneous regime where the superficial velocities are higher. In order to simulate the system, a...

We consider the spatio-temporal development of the long-wave and shortwave instabilities in a pair of counter-rotating vortices in the presence of a uniform axial advection velocity. The stability properties depend upon the aspect ratio a=b of the vortex pair, where a is the core radius of the vortices and b their separation, and upon W 0 =U 0 the ratio between the self-induced velocity of the ...

This paper concern with the investigation of peristaltic transport of a micropolar fluid in an asymmetric channel in the presence of induced magnetic field. The effect of slip velocity on the boundaries of the flow field is taken into account. The analysis is carried out by using long wave length and low Reynolds number assumptions. Mathematical expressions for axial velocity, stream function, ...

Based on the results of molecular dynamics simulations, we propose an analytical expression for the velocity distributions of molecules ejected in laser ablation. The Maxwell-Boltzmann distribution on a stream velocity, commonly used to describe the measured velocity distributions, is modified to account for a range of stream velocities in the ejected plume. The proposed distribution function p...