On velocity response of tracing particles in laser based velocimetry to complex flows, 2, numerical analysis of sliding velocity of tracing particles in various flows
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摘要: 以修正后适用于高颗粒雷诺数的粒子非恒定运动方程为基础,将该方程无量纲化,定义了一般流场中粒子跟随性的概念,给出了粒子跟随性的数学表述。据此对典型流场中粒子的运动进行了数值计算,并定量分析了粒径、密度等参数对不同流动中示踪粒子跟随特性的影响。Abstract: Application of the laser-based velocimetry to experimental researches of flows is closely involved in tracking ability of particles whose density or initial velocity is different from that of fluid.Based on the non-dimensional particle transient motion equation for high particle Reynolds number, a concept of velocity of small particles in response to arbitrary flows are pre sented and described mathematically.In various typical flows, the particle's transient motions are investigated numerically, and the effects of several parameters, such as particle diameter and density, on particle's velocity in responses to flows are analyzed quantitatively.
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