Study of Particle Deposition Mechanism in Gas-Solid Two-Phase Flow Based on Numerical Simulation and Its Parameter Influence Law
Year: 2025
Type: article
Abstract: 基于RNG k-ε湍流模型，通过数值模拟手段，对H型翅片管省煤器通道内颗粒特性从颗粒粒径、模拟时间、流速及颗粒浓度等多个角度，系统研究了气固两相流中颗粒的沉积特性，揭示了影响颗粒沉积的关键因素及其作用机制。研究结果表明：沉积速率随模拟时间的延长显著增加，20 s模拟时间下的沉积速率分别较10 s和5 s增加1.94倍和3.43倍。颗粒粒径与沉积速率呈正相关关系，尤其在粒径大于5 μm时，沉积速率快速上升，表现出强烈的惯性主导效应。颗粒粒径还影响其在流场中的分布特征：小颗粒趋于均匀分布，而大颗粒易在低速区及尾涡区聚集沉积，随着流速提升，沉积速率明显降低，5 m/s至10 m/s时下降幅度达46%~82%。Based on the RNG k-ε turbulence model, the deposition characteristics of particles in the gas-solid two-phase flow were systematically investigated by means of numerical simulation from the perspectives of particle size, simulation time, flow velocity and particle concentration in the channel of H-type finned-tube economizer, and the key factors affecting the deposition of particles and their action mechanisms were revealed. The results show that the deposition rate increases significantly with the simulation time, and the deposition rate increases 1.94 times and 3.43 times in 20 s compared with 10 s and 5 s, respectively. The particle size is positively correlated with the deposition rate, especially when the particle size is larger than 5 μm, the deposition rate increases rapidly, showing a strong inertia dominant effect. The particle size also affects the distribution of particles in the flow field: small particles tend to be uniformly distributed, while large particles tend to be aggregated and deposited in the low-velocity region and the tail vortex region. The deposition rate decreased significantly with increasing flow velocity, with a decrease of 46%~82% from 5 m/s to 10 m/s.
Source: Modeling and Simulation
Author: 境泰 王
Language: English
Subfield: Ocean Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4411708065