论文标题
关于边界层流动中惯性颗粒增强的湍流分散的物理起源
On the physical origin of enhanced turbulent-dispersion of inertial particles in boundary layer flows
论文作者
论文摘要
关于湍流边界层流的惯性粒子传输的最神秘的科学问题之一是湍流施密特数的值，因为粒子扩散率和湍流涡流粘度的比率。使用湍流粒子通量曲线的直接声学测量以及两相流动湍流分解数值模拟，证明粒子的湍流分散体有所减少，而不是通过现有文献模型预测时会增强。解释在于误导性的误导性假设是在静态水中沉降速度以估计湍流粒子扩散率，而直接测量和模拟湍流粒子通量的模拟支持了沉降迟缓的发生。
One of the most enigmatic science question concerning inertial particle transport by a turbulent boundary layer flow is the value of the turbulent Schmidt number as the ratio of particle diffusivity and turbulent eddy viscosity. Using direct acoustic measurement of turbulent particle flux profile, and two-phase flow turbulence-resolving numerical simulation, it is demonstrated that turbulent dispersion of particles is reduced rather than enhanced when predicted with existing literature model. The explanation lies in the misleading assumption of settling velocity in quiescent water to estimate the turbulent particle diffusivity while direct measurements and simulations of turbulent particle flux support the occurrence of settling retardation.
