摘要
本文对管束旋转时,管外流体流动换热特性进行了研究。在管壁恒壁温条件下,对流体的温度场、速度场进行模拟,得到了静止状态与旋转状态的温度场与速度场。旋转状态下,由于管束旋转对流体的搅动,折流板缺口附近的流动死区减小,流场形态发生变化,温度场分布更均匀,平均温度更高。采用换热阻力综合评价指标JF因子对旋转状态与静止状态进行综合性能比较,旋转状态的综合效果要优于静止状态。转速不变时存在最佳入口流速,在此入口流速下,JF因子最大,综合性能最好。
The flow and heat transfer characteristics of the fluid outside rotating tube bundle were investigated numerically in this paper. Under the condition of constant wall temperature, the temperature and velocity distribution of the fluid were achieved in both stationary and ro- tating state of the tube bundle. For the churning action caused by the rotation of the tube bundle, the stagnant flow regions near the baffles were reduced, the flow field changed a lot, the temperature field was better distributed and the average temperature was higher. JF factor was adopted to evaluate the heat transfer performance. The result indicated that the compre- hensive effect was better while the tube bundle was in rotating sate. When the rotating speed remained constant, there existed an optimum inlet flow rate under which the JF factor got its maximum.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第2期314-316,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展计划项目(No.2007CB206903)
山东省科技攻关项目(No.2008GG10007009)
关键词
换热器
对流换热
数值模拟
旋转
JF因子
heat exchanger
convection heat transfer
numerical simulation
rotation
JF factor
