摘要
为研究梯形螺旋外肋管(TSEFT)强化传热效果,建立了其管外周期单元流道模型。在雷诺数10000≤R e≤24000范围内,通过数值模拟研究不同参数对其流动传热以及阻力性能的影响。研究表明:梯形螺旋外肋改变了流体的流动状态,从而扰动边界层使其不断脱落,达到强化传热的效果。随着肋高e与底宽b的增大,顶角α与螺距p的减小,梯形螺旋外肋管的传热系数与压降均相应增加。在低雷诺数区域,梯形螺旋外肋管综合性能普遍优于圆形外肋管,综合换热因子最大可以达到1.42。利用多元线性回归拟合了梯形螺旋外肋管管外流动传热与阻力计算关联式,为该类换热管的工程应用提供了设计依据。
The periodic unit flow channel model of trapezoidal spiral external finned tube(TSEFT)was established to study the heat transfer enhancement.Effects of different parameters of TSEFT on heat transfer and resistance performance of the tube were studied by numerical simulation in the range of 10000≤R e≤24000.The results show that TSEFT changes the flow state of the fluid,which disturbing the boundary layer and causing it to fall off continuously,finally strengthening the heat transfer.The heat transfer coefficient and pressure drop increase with the increase of fin height and bottom width,while they increase with the decrease of top angle and pitch.In the low Reynolds number region,the comprehensive performance of TSEFT is generally better than circular spiral external finned tubes and the highest comprehensive heat transfer factor can be 1.42.The correlations for calculating the heat transfer and flow resistance of TSEFT were fitted by using multivariate linear regression.They provide guidance and basis for the design and engineering application of this kind of tubes.
作者
曹佳铭
王学生
陈琴珠
CAO Jia-ming;WANG Xue-sheng;CHEN Qin-zhu(School of Mechanical and Power Engingeering,Key Laboratory of Pressure System and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第8期22-27,共6页
Chemical Engineering(China)
关键词
强化传热
数值模拟
螺旋外肋管
流阻特性
heat transfer enhancement
numerical simulation
spiral external finned tube
flow resistance characteristics
作者简介
曹佳铭(1996-),男,博士研究生,主要研究方向为强化传热,E-mail:17621778372@163.com;通信联系人:王学生(1965-),男,博士,教授,研究方向为强化传热与高效换热设备,E-mail:wangxs@ecust.edu.cn。
