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The influence of active dynamic control flow vortexes on enhancing convective heat transfer
International Journal of Thermal Sciences ( IF 4.9 ) Pub Date : 2021-05-27 , DOI: 10.1016/j.ijthermalsci.2021.107058
Pengyong Xie , Xiaobing Zhang

With the development of heat engines, in some fields the heat wall suffers from dynamic heat flux, thus some cooling control techniques are needed to meet this dynamic cooling requirement. The traditional stationary vortex generators have not met the cooling demand in these cooling fields with dynamic heat flux. Existing studies have shown that the capacity of convective heat transfer depends on the distribution characteristics of the velocity and temperature field of the cooling fluid. Therefore, considering to the factors of single-side heat transfer and fluid flow boundary layer, new and efficient mixing heat technology is increasingly demanded for many industrial fields. In this paper, the dynamic turbulence generator such as spherical cylinder is adopted to study the influence of flow vortexes on heat transfer and achieves a better distribution of velocity field and facilitates the enhancement of convective heat transfer. Research results indicate that compared to traditional stationary vortex generator technologies, vibration spherical cylinder can effectively improve heat transfer performance and leads to a lower flow resistance. As a conclusion, the flow and heat transfer performance increase with the vibration frequency increasing. When Re = 7255, the thermal hydraulic performance is increased by a maximum 24.55% than traditional stationary vortexes generator. When Re = 14510, the performance is better than stationary cylinder structure. And the vibration frequency can be adjusted timely according to cooling demand.



中文翻译:

主动动态控制流涡流对增强对流换热的影响

随着热力发动机的发展,在某些领域中,热壁遭受动态热通量的困扰,因此需要一些冷却控制技术来满足这种动态冷却需求。传统的固定涡流发生器无法满足这些具有动态热通量的冷却领域的冷却需求。现有研究表明,对流传热的能力取决于冷却液的速度和温度场的分布特征。因此,考虑到单侧传热和流体流动边界层的因素,许多工业领域对新型高效混合热技术的需求日益增长。在本文中,采用球面圆柱等动态湍流发生器研究了涡流对传热的影响,实现了速度场的更好分布,有利于对流换热的增强。研究结果表明,与传统的固定涡流发生器技术相比,振动球形圆柱体可以有效地改善传热性能,并导致较低的流阻。结论是,随着振动频率的增加,流动和传热性能增加。当Re = 7255时,热液压性能比传统的固定涡流发生器最多提高24.55%。当Re = 14510时,其性能优于固定圆柱结构。并可以根据冷却需求及时调整振动频率。

更新日期:2021-05-27
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