不同固相黏度模型对鼓泡床气泡行为的数值模拟

Numerical simulation of bubbling behaviors in a bubbling fluidized bed with various solid-phase viscosity models

基于双流体模型,应用Fluent软件包对带有单喷嘴的二维鼓泡床中气泡行为进行数值模拟。采用常固相黏度模型(CPV)和基于颗粒动理学的固相黏度模型(KTGF),通过计算气泡的形成、气体泄漏率、气泡直径及气泡上升速度对不同模型进行比较研究,其中编程实现了KTGF模型中的Lun等模型与Hrenya和Sinclair模型模块。通过与文献中的实验数据进行对比发现KTGF模型普遍优于CPV模型,其中Lun等模型与Hrenya和Sinclair模型的模拟值最接近实验数据。

Bubbling behaviors in a two-dimensional single jet bubbling fluidized bed was numerically simulated based on a two-fluid model by Fluent software package.The constant particle viscosity model（CPV）and the model based on Kinetic Theory of Granular Flow（KTGF）were selected.A comparative study on two kinds of solid-phase viscosity models was implemented by calculating the formation of bubbles,gas leakage ratio,equivalent bubble diameter and bubble rise velocity.The model of Lun et al and that of Hrenya and Sinclair modules that based on KTGF were written especially by the authors.By comparing with the experimental data in literature,it was reflected that KTGF models are generally better than CPV models.Especially,simulation results with the model of Lun et al and that of Hrenya and Sinclair fitted the best to experimental results.