Abstract

Numerical simulations were carried out to investigate the swirling decaying flow generated by a novel axial guide vane swirler with profiled blades and no supporting device in a tube and its effect on heat transfer and pressure drop compared to a developed turbulent flow in a no swirl tube. Reynolds number ranged from 10,000 to 200,000. Turbulence was modeled using a $k-\omega$ Shear Stress Transport model and a Low-Reynolds approach. The swirling flow enhances significantly the heat transfer locally especially in the developing swirling flow region and globally with an increase of Nusselt number from 1.57 to 1.34 respectively for Reynolds number of 10,000 and 200,000. Pressure drop is also increased up to 2.9 for a Reynolds number of 200,000, however this is relatively low compared to other axial guide vane swirler device encountered in the literature. Furthermore, the Performance Evaluation Criterion of the swirling flow is higher than 1 for both Reynolds number of 10,000 and 30,000.

摘要

进行了数值模拟，以研究具有异形叶片且管中没有支撑装置的新型轴向导叶旋流器产生的涡流衰减流及其对传热和压降的影响，与在无涡流管中形成的湍流相比。雷诺数介于 10,000 至 200,000 之间。湍流是用一个$克-\omega$剪切应力传递模型和低雷诺数方法。随着雷诺数分别为 10,000 和 200,000 的努塞尔数从 1.57 增加到 1.34，旋流显着增强了局部传热，尤其是在发展中的旋流区域和全局。对于 200,000 的雷诺数，压降也增加到 2.9，但是与文献中遇到的其他轴向导向叶片旋流器装置相比，这相对较低。此外，对于 10,000 和 30,000 的雷诺数，涡流的性能评估标准都高于 1。