大气污染治理技术及原理
马千里,姚强.超细颗粒在单个上升气泡内的沉积过程模拟[J].环境科学学报,2005,25(6):727-733
超细颗粒在单个上升气泡内的沉积过程模拟
- Numerical simulation of deposition of fine particles in single rising bubble
- 基金项目：国家重点基础研究发展计划资助(2002CB211600)
- 作者
- 单位
- 马千里
- 热能动力工程与热科学重点实验室, 清华大学热能工程系, 北京 100084
- 姚强
- 热能动力工程与热科学重点实验室, 清华大学热能工程系, 北京 100084
- 摘要：从单个上升气泡内外流场的完全Navier-Stokes方程数值解出发,用Lagrange轨道跟踪的方法研究了超细颗粒在单个上升气泡内的沉积过程.在气泡的流场中考虑了气泡运动中的变形.在超细颗粒的受力中考虑了粘性阻力和Brownian运动扩散力.在常温下水空气体系中,对气泡直径0.1～1mm,超细颗粒直径0.1～2μm的情况进行了数值模拟,并对数值模拟的结果进行了拟合,得出简便易用的经验公式.
- Abstract：The deposition of fine particles is numerically simulated with a Lagrangian approach in a single rising bubble. The bubble outer flow, internal circulation and shape are determined by solving full Navier-Stokes Equations. Viscous forces and Brownian diffusion forces are considered. Parametric calculations are performed for air bubbles containing fine particles and rising in stagnant water, within parameter ranges where the diameter of bubbles from 0.05 mm to 1mm, the diameter of fine particles from 0.1 μm to 2 μm. From the simulation results, an empirical formula is deduced for future evaluation of deposition coefficient from a given bubble diameter and fine particle diameter.
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