2014 We present a continuum model for a non-dilute suspension of spheres with variable radius. To simplify the resulting equations and to stress the expansion dynamics only, we leave aside the problems of relative motion and temperature difference between the spheres and the surrounding liquid. It is shown that the state variable associated with the expansion degree of freedom is the scalar mom...

DNS simulations of two-phase turbulent bubbly channel flow at Res = 180 (Reynolds number based on friction velocity and channel half-width) were performed using a stabilized finite element method (FEM) and a level set approach to track the air/water interfaces. Fully developed turbulent single-phase solutions obtained previously using the same stabilized FEM code were used as the initial flow f...

Nonlinear bubble dynamics are often viewed as the unfortunate consequence of having to use high acoustic pressure amplitudes when the void fraction in the near-surface oceanic bubble layer is great enough to cause severe attenuation (e.g. >50 dB/m). This is seen as unfortunate since existing models for acoustic propagation in bubbly liquids are based on linear bubble dynamics. However, the deve...

Single screw expansion is widely used in petroleum and chemical department, energy recovery engineering, power engineering and many practical applications. Yet the problems of gas leakage in the single screw expansion seriously affect its efficiency. An experimental investigation of gas-liquid two-phase flow patterns and pressure drop inside the single screw expansion has been carried out. The ...

In this paper, a hybrid particle swarm optimization based on the natural selection (NPSO) was presented and used to optimize the parameters of Least Square Support Vector Machine (LSSVM). The NPSO algorithm overcomes the shortcomings of premature convergence and poor local search capability of traditional Particle Swarm Optimization (PSO). Then a classification model of oil-gas-water three-phas...