Sakib Md Nazmus, Shuvo Md Shahneoug, Rahman Rezwana, Saha Sumon
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh.
Heliyon. 2023 Mar 15;9(3):e14603. doi: 10.1016/j.heliyon.2023.e14603. eCollection 2023 Mar.
A numerical simulation of aerosol particle deposition in a horizontal circular pipe with a corrugated wall under turbulent flow has been carried out in this research. This paper uses the RNG - turbulence model with Enhanced Wall Treatment to simulate fluid flow. Furthermore, the Lagrangian particle tracking model simulates particle deposition in the corrugated pipe. Air-particle interaction is influenced by Stokes number, surface roughness, flow velocity, particle diameter, and pipe diameter. For the parametric simulation, particle diameter varies from 1 to 30 μm, whereas the Reynolds number ranges from 5000 to 10,000. The effect of corrugation height and pipe diameter on deposition efficiency is also investigated. This study shows that corrugation height significantly increases particle deposition compared to the smooth wall pipe. As the pipe diameter decreases, keeping the corrugation ratio constant, deposition efficiency also increases. Moreover, high flow velocity enhances deposition efficiency for particle diameters lower than 5 μm.
本研究对湍流条件下波纹壁水平圆形管道内气溶胶颗粒沉积进行了数值模拟。本文采用带有增强壁面处理的RNG湍流模型来模拟流体流动。此外，拉格朗日粒子跟踪模型模拟了颗粒在波纹管中的沉积。气固相互作用受斯托克斯数、表面粗糙度、流速、颗粒直径和管道直径的影响。对于参数模拟，颗粒直径在1至30μm之间变化，而雷诺数范围为5000至10000。还研究了波纹高度和管道直径对沉积效率的影响。研究表明，与光滑壁管道相比，波纹高度显著提高了颗粒沉积。在波纹率保持不变的情况下，随着管道直径减小，沉积效率也会提高。此外，对于直径小于5μm的颗粒，高流速会提高沉积效率。
