扭带强化传热性能的数值与实验研究

Numerical and experimental studies on heat transfer enhancement of twisted tape inserts

中文关键词: 数值模拟、强化传热、正反转扭带、湍流

英文关键词: numerical simulations, heat transfer enhancement, Left-Right twisted tape, turbulence flow

中文摘要:

      通过模拟和实验的方法研究在湍流工况下（3000

英文摘要:

      The heat transfer and resistance characteristics of a heat exchanger with different twisted tape inserts under turbulent conditions (3 000 < Re < 10 000) were numerically and eaprimentally studied. Different from typical twisted tape (TT), the Left-Right twisted tape (LRTT) which alternates clockwise and counterclockwise was proposed. The characteristics of TTs with different twisted ratios, the non-cut and semicircle-cut LRTT with the twisted ratio of 3 were numerically studied. The comparisons in data of simulations and experiments were carried out. The results showed that the heat transfer enhancement effect of twisted tapes increases when the Reynolds number decreases in turbulent flow. For the typical twisted tapes with different twisted ratios, the Nusselt numbers, friction factors and performance evaluation criteria (PEC) increase with the decrease of twist ratios.when the twisted ratio is 3, the heat transfer performances for two types of LRTT are better than that for TT,andthe performance of the mom-cut LRTT is best. The maximum error for data of simulations and experiments were less than 8%.