The influence of active dynamic control flow vortexes on enhancing convective heat transfer

• Published in: International journal of thermal sciences 2021-10, Vol.168, p.107058, Article 107058
• Main Authors: Xie, Pengyong, Zhang, Xiaobing
• Format: Article
• Language: English
• Subjects: Active flow control; Enhancing heat transfer; Spherical cylinder; Velocity field
• ISSN: 1290-0729; 1778-4166
• DOI: 10.1016/j.ijthermalsci.2021.107058

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.