摘要
为了探明内设横管束型换热器内颗粒流动特性,利用离散元法建立换热器数值计算模型,模拟了换热器内颗粒流动过程,分析了换热器内颗粒流型演化过程、流动区域分布及速度分布。结果表明,管束对颗粒流动影响明显,换热器内颗粒流动均匀性良好;换热器内颗粒流动分为主流区、绕流区及边界层,其中,绕流区范围为管束两侧各3倍粒径,边界层厚度为4倍粒径;中心主流区内颗粒运动最快,左右主流区次之,绕流区和边界层内颗粒运动最慢。最后利用自行搭建的可视化实验系统对模型进行了实验验证,通过对比实验与数值模拟结果验证了模型的有效性。
In order to clarify the flow characteristics of particles in the heat exchanger,a numerical calculation model of the heat exchanger was established by the discrete element method.The process of particle flow in the heat exchanger was simulated by the model.The evolution of flow patterns,flow region distributions and velocity distributions in the heat exchanger were analyzed.The results show that the effect of tube bundle on particle flow is significant,and the uniformity of particle flow in the heat exchanger is good.There are major flow regions,flow around regions and boundary layers of particle flow in the heat exchanger.The scope of a flow around region is 3 d p at both sides of a column of tubes.The thickness of a boundary layer is 4 d p from a wall.The movement of particles in major flow region of center is the fastest,in major flow region of left or right is the next,and in a flow around region or a boundary layer is the slowest.A visual experimental system was set up to validate the discrete element model.The validity of the model was confirmed by comparing experimental results with numerical simulation results.
作者
郭岱昌
郑斌
梁浩天
刘永启
孙鹏
GUO Dai-chang;ZHENG Bin;LIANG Hao-tian;LIU Yong-qi;SUN Peng(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255049,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2018年第5期1713-1722,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家重点研发计划重点专项(2017YFB0603504-2)
山东省自然科学基金资助项目(ZR2017LEE019
ZR2014EL030)
关键词
兰炭
离散元法
颗粒流
换热器
横管束
实验验证
semi-coke
discrete element method
granular flow
heat exchanger
horizontal tube bundle
experimental validation
