摘要
通过对脉冲-旋流气流干燥气固两相流分析及数值模拟的研究,采用欧拉-拉格朗日模型和计算流体力学软件Fluent对脉冲-旋流气流干燥机内部的气固两相流场进行了三维模拟,揭示脉冲-旋流气流干燥木质纤维的机理和传热传质特性。结果表明,加载物料后的气流速度变化明显,并且物料与气流速度有2 m/s左右的速度差,有利于传热传质。气流速度越大,物料停留时间越短。进料速度的增加会在旋流干燥器底部形成一个回流区,易造成物料的返流,并增加了物料在干燥机停留时间。通过对计算出的温度、速度、时间的曲线与实测值进行对比,二者最大相对误差小于10%,验证了fluent气固两相流模拟方法建立的脉冲-旋流气流干燥过程的数学模型是有效的。
Through gas-solid two-phase flow analysis and numerical simulation of the impulse-cyclone airflow drying,the Euler-Lagrange model and computational fluid dynamics software Fluent were applied to simulate the gas-solid two-phase flow field to reveal the mechanism of drying and heat and mass transfer properties.The airflow velocity changed obviously and 2 m/s velocity difference between fibers and airflow showed in the simulation,which was advantageous to the heat and mass transfer.The increase of feed speed led to a backflow area at the bottom of cyclone dryer,which easy to cause reflux of the material and long residence time of the wood fibers in the dryer.By calculating the curve of the temperature,speed,time compared with the measured values,the maximum relative error between simulation and test was less than 10%,which verified gas-solid two phase flow method of Fluent to establish the mathematical model of impulse-cyclone airflow drying was effective.
作者
陈峰
高珣
程万里
Chen Feng;Gao Xun;Cheng Wanli(Liaoning Forestry Vocational-Technical College,Shenyang 110101,P.R.China;Key Laboratory of Wooden Materials Science and Engineering of Jilin Province,Beihua University;Key Laboratory of Bio-based Material Science and Technology of Ministry of Education,Northeast Forestry University)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第4期58-62,66,共6页
Journal of Northeast Forestry University
关键词
脉冲-旋流气流干燥
木纤维
数值模拟
气固两相流
计算流体力学
Impulse-cyclone airflow drying
Wood fibers
Numerical simulation
Gas-solid two-phase flow
Computational fluid dynamics
