摘要
为了指导开架式气化器(super open rack vaporizer,下文简称Super ORV)的优化运行和设计,针对超级开架式气化器加热段的复杂流道进行了数值模拟研究,得到了插入不同参数扰流杆的换热管各工况下表征对流换热强度的努塞尔数Nu和阻力特征的摩擦因子f。结果发现:花瓣形流道由于有较大的换热面积,从而在相同条件下其流道有更大的对流换热强度(Nu);金属扰流杆良好的导热性加速了管内热量交换,会使Nu增大;花瓣形环隙内粘性流体滞留阻碍换热的现象会随扰流杆导程减小而减弱,所以Nu会随扰流杆的导程的减小而增大。通过模拟数据拟合得到了花瓣形流道和十字形扰流杆共同作用下Nu和f的经验公式。
In order to guide the optimal operation and design of the super open rack vaporizer(Super ORV),the complex flow channel of the heating section of the Super ORV was studied by numerical simulation.The Nusselt Number Nu,which represented the convective heat transfer intensity and the friction factor f,which represented the resistance characteristics,were obtained for the heat transfer tube with different parameters of spoiler.The results show that the petal shaped channel has larger heat exchange area,so it has greater convective heat transfer intensity(Nu)under the same conditions;the good thermal conductivity of metal spoiler accelerates the heat exchange in the tube,which will increase Nu;the phenomenon of viscous fluid retention in petal annular space hinders heat exchange will weaken with the decrease of the spoiler lead,so Nu will increase with the decrease of the spoiler lead.At last,the empirical formulas of Nu and f under the action of petal shaped channel and cross shaped spoiler were obtained by fitting the simulation data.
作者
吕国政
张引弟
辛玥
路达
陈清海
Lü Guozheng;Zhang Yindi;Xin Yue;Lu Da;Chen Qinghai(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;China Railway Urban Construction Group Co.Ltd.,Changsha 410218,China)
出处
《低温与超导》
CAS
北大核心
2020年第11期64-70,共7页
Cryogenics and Superconductivity
基金
国家自然科学基金(51974033)
长江青年科技创新团队基金(2015cqt01)
大学生创新创业训计划项目(2019314)资助。
关键词
气化器
换热管
花瓣形流道
十字形扰流杆
强化换热
数值模拟
Vaporizer
Heat transfer tube
Petal-shaped channels
Cross-shaped spoiler
Enhanced heat transfer
Numerical simulation
