The Interactions of Finite-Sized Particles and Turbulence in Dispersed Two-Phase Flow

本文将研究10-500 (m)范围内的球面对分散的两相湍流的影响。大量悬浮粒子运动的数值模拟将包括粒子尾迹和湍流的耦合。对于有限粒子雷诺数，在体积浓度高达5%的粘性流体中，将使用多动量过程来表示粒子对局部流动扰动的影响。采用拟特殊方法对整个流体流场进行模拟。将分析局部流动特性（涡度、应变速率）导致的颗粒优先浓度，以及颗粒与小尺度涡度的动态耦合。计算结果将与泡流和浆流实验进行比较。这项研究将有助于发展对工程和环境应用中感兴趣的两相湍流的改进建模的基本理解。＊＊＊

ABSTRACT CTS-9424169 M. Maxey The influence of spherical in the range of 10-500 (m on dispepsed, two-phase turbulent flow will be investigate. Numerical simulations for the motion of a large number of particles in suspension will include the coupling of the particle wakes and the turbulence. A multiple momentum procedure will be used to represent the effect of particles on local flow disturbances, for finite particle Reynolds number, in viscous fluids with concentrations up 5% by volume. The overall fluid flow field will be simulated with pseudo-special methods. Preferential particle concentrations due to local flow characteristics (vorticity, rate of strain), and the dynamic coupling of the particles with the small scale vorticity, will analyzed. The computational results will be compared to bubbly and slurry flow experiments. This study will help develop fundamental understanding for improved modeling of two-phase turbulent flow of interest in engineering and environmental applications. ***