摘要
应用贴体坐标系,基于颗粒相采用颗粒动力学的气固两相双流体模型,数值模拟单沉浸管流化床内颗粒及气泡的行为,计算得到的瞬时颗粒浓度和速度揭示了气泡绕流沉浸管时出现的合并和破裂过程.瞬时颗粒浓度的功率谱密度表明,颗粒脉动的主频率为0.4～1.0Hz,大于床内无沉浸管颗粒的频率值.数值模拟得到的气泡频率与文献中实测值相吻合.
A numerical study was conducted based on the gassolid twofluid model using bodyfitted coordination to analyze the behavior of particles and bubbles in fluidized beds with an immersed tube.The kinetic theory of granular flow was implemented in the model.The images of simulated instantaneous particle concentration and velocity give the whole processes of the amalgamation and breaks of bubbles.The main frequencies of instantaneous particle concentrations are in the range of 0.4-1.0 Hz which are larger than that in the bed without tube.Calculated particle velocity and bubble frequencies around a tube were in good agreement with previous experimental findings.
出处
《燃烧科学与技术》
EI
CAS
CSCD
2003年第5期475-481,共7页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(10072019).
关键词
流化床
贴体坐标系
沉浸管
fluidized bed
body-fitted coordination
immersed tube
