The transport and deposition of nano-particles in annular pipe flows under laminar conditions were studied. The Lagrangian particle tracking method was used to simulate the Brownian diffusion of ultrafine solid particles in a three-dimensional domain. The effects of nano-particle size, flow rate, inner and outer pipe diameters, pipe length, and temperature were studied. The computational models for the deposition of nano-particles in tubular, as well as annular pipe flows, were validated. Furthermore, using the CFD simulations and the Lagrangian particle tracking results, a new correlation for evaluating the deposition fraction of nano-particles in annular pipe flows was developed. The presented results could provide guidelines for evaluating nano-particle transport and deposition in annular pipes.

研究了层流条件下纳米颗粒在环形管流中的迁移和沉积。拉格朗日粒子跟踪方法用于模拟三维区域中超细固体粒子的布朗扩散。研究了纳米颗粒尺寸，流速，内外管径，管长和温度的影响。验证了管状和环形管道流中纳米颗粒沉积的计算模型。此外，利用CFD模拟和拉格朗日粒子跟踪结果，开发了一种新的相关性，用于评估环形管道流中纳米粒子的沉积分数。提出的结果可以为评估纳米颗粒在环形管道中的传输和沉积提供指导。