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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Numerical analysis of convective heat transfer enhancement in swirl tubes
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Numerical analysis of convective heat transfer enhancement in swirl tubes

机译：旋流管内对流换热强化的数值分析

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Purpose - The aim of this paper is to investigate the convective heat transfer in swirl tubes, which are obtained by roto-translating a circular section eccentric with respect to the rotation axis. The geometry is numerically investigated with the aim of evaluating the convective heat transfer enhancement effect due to the secondary flow induced by the centrifugal force. Design/methodology/approach - The governing equations, i.e. continuity, momentum and energy equations, are integrated numerically within Comsol Multiphysics® environment, under the assumption of incompressible Newtonian and constant properties fluid and of periodically fully developed laminar flow for what concerns both the hydrodynamic and the thermal problem under the uniform wall heat flux thermal boundary condition. Findings - The heat transfer performance of the geometry is discussed in relation to the flow pattern. In particular, the numerical results show that two different stable flow regimes may exist, according to the ratio of the Reynolds number to the dimensionless helix pitch. The Nusselt number augmentation becomes significant for high Prandtl number fluids when a critical Re/P* value, corresponding to the onset of the centrifugal forces induced secondary flow, is reached. Originality/value - The geometry here investigated represents an interesting solution to enhance the convective heat transfer in situations in which the flow, although disturbed, persists in the laminar regime. This type of enhanced tubes shows then interesting heat transfer performances (which becomes particularly significant for high Prandtl number values) by thus suggesting convenient applications also for highly viscous fluids which are often treated under the laminar flow regime.
机译：目的-本文的目的是研究涡流管中的对流传热，该涡流管是通过使相对于旋转轴偏心的圆形截面旋转平移而获得的。为了评估由于离心力引起的二次流对流换热的增强效果，对几何形状进行了数值研究。设计/方法/方法-在不可压缩的牛顿流体和恒定特性流体以及周期性充分发展的层流的假设下，涉及流体力学的控制方程，即连续性，动量和能量方程，在ComsolMultiphysics®环境中以数值方式集成均匀壁热通量热边界条件下的热问题。研究结果-讨论了几何形状的传​​热性能与流型的关系。尤其是，数值结果表明，根据雷诺数与无量纲螺旋螺距的比值，可能存在两种不同的稳定流态。当达到临界Re / P *值（对应于离心力引起的二次流的开始）时，对于高Prandtl数的流体，Nusselt数的增加就变得很重要。独创性/价值-此处研究的几何形状代表了一种有趣的解决方案，可在流动（尽管受到干扰）在层流状态下持续存在的情况下增强对流传热。这种类型的增强管随后显示出令人感兴趣的传热性能（对于高Prandtl值尤为重要），因此建议将其方便地应用于经常在层流状态下处理的高粘性流体。

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