Abstract An experimental and numerical study was done to discover the effect of insertion of twisted tapes of decreased tapered configurations inside a tube on thermal and hydrodynamic fields. Constant heat flux was supplied to the tube surface and the working fluid was the air which was flowed with turbulent flow of 10000 ≤ Re ≤ 40000. RNG k-e turbulent model was used. The obtained results showed that there is no significant difference in thermal performance factor between some studied cases of inserting decreased tapered twisted tape and the case of inserting typical twisted tape. The obtained experimental data of Nusselt number, friction factor and thermal performance factor were described by Empirical correlations.

中文翻译：

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新配置扭曲带管内流动和传热特性的性能评估

摘要 进行了实验和数值研究，以发现在管内插入减小锥形结构的扭曲带对热力和流体动力场的影响。向管面提供恒定热通量，工作流体为空气，湍流为10000≤Re≤40000。采用RNG ke湍流模型。得到的结果表明，在一些研究的插入减少的锥形双绞带的情况和插入典型的双绞带的情况之间，热性能因子没有显着差异。获得的努塞尔数、摩擦系数和热性能系数的实验数据通过经验相关性进行描述。