Use of twisted tape inside the tube is a critical passive technique to enhance the heat transfer. In this technique axis of rotation of twisted tape plays a key role in heat transfer enhancement. The present work deals a turbulent, steady state and 3D Al₂O₃/water nanofluid flow through tube with twisted tapes. Different schematic of twisted tapes in term of their axis of rotation inside the tube is considered. Two phase model of governing equations in mixture form with turbulence effect is considered for the solution. RNG k-ε turbulent model has been taken to capture turbulent effect. The novelty in the present work is to find the effect of alternate axes of rotation of twisted tape inside the tube along with Al₂O₃ nanoparticle on heat transfer and pressure drop. When compared with one twisted tape inside the tube at Re = 13,000 and ϕ = 1%, further maximum increment of 5.1% and 10.5% in average Nusselt number is obtained for the case of two and three twisted tape having alternate axis of rotation. A maximum of 41% of increment in pressure drop at Re = 33,000 and 1% is obtained for three twisted tape with alternate axis of rotation.

在管内使用双绞带是增强热传递的关键被动技术。在这项技术中，扭曲带的旋转轴在增强传热方面起着关键作用。目前的工作涉及湍流、稳态和 3D Al ₂ O ₃ /水纳米流体流过带有扭曲带的管。考虑在管内的旋转轴方面的扭曲带的不同示意图。求解考虑了具有湍流效应的混合形式控制方程的两相模型。已采用 RNG k-ε湍流模型来捕捉湍流效应。当前工作的新颖之处在于发现管内扭曲带的交替旋转轴与 Al ₂ O _{3 的影响}纳米颗粒对传热和压降的影响。与 Re = 13,000 和ϕ  = 1%的管内的一根扭绞带相比，对于具有交替旋转轴的两根和三根扭绞带，平均努塞尔数进一步增加了 5.1% 和 10.5%。在 Re = 33,000 和 1% 时，对于具有交替旋转轴的三个扭曲带，压降增量最大为 41%。