旋流片支撑缩放管管束的复合强化传热

Compound heat transfer enhancement of converged-diverged tube supported by twisted-leaves

提出了由旋流片支撑缩放管管束的管壳式换热器壳程结构,对壳程工质为空气时,4种类型旋流片和空心环分别支撑缩放管管束的传热与流阻性能进行了实验研究,并进行了相互比较。实验结果表明:工质为空气时,270-20.3、180-20.3两种旋流片分别与缩放管管束配合,均具有优良的复合强化传热性能。尤其是270-20.3旋流片与缩放管管束配合,当Reynolds数为2000～20000时,其强化传热综合评价因子比空心环与缩放管管束配合时平均高出18%。

A new shell structure of converged-diverged tube bundle supported by twisted-leaves in shell- and-tube exchanger is proposed. The characteristics of heat transfer and flow resistance of converged- diverged tube bundle supported by four types of twisted-leaves and ring respectively for air turbulent flow in the longitudinal direction were investigated experimentally and compared with each other. The results indicated that the compound heat transfer enhancement of the converged diverged tube bundle supported by 270-20.3 or 180-20.3 twisted-leaves was obvious. Especially for 270-20.3, the heat transfer enhancement valuation factor was higher than that of converged diverged tube bundle supported by ring by 18% when Reynolds number was in the range from 2000 to 20000 for air turbulent flow.