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Flow-induced oscillation of membrane tapes and its effect on heat transfer of a transitional pipe flow
International Journal of Heat and Mass Transfer ( IF 5.2 ) Pub Date : 2021-02-24 , DOI: 10.1016/j.ijheatmasstransfer.2021.121128
Xiaohang Qu , Maocheng Tian

Flow-induced oscillation is an effective way for heat transfer enhancement, which embraces the advantages of requiring no extra energy consumption and better performance for preventing fouling or soot formation. In the present study, a thin membrane tape with length, width and thickness of 90 mm, 3.8 mm and 13.3 um respectively was mounted inside a horizontal pipe with an internal diameter of 13 mm. By visual measurement, the tape was demonstrated to be able to oscillate within airflow and the oscillation frequency was found to increase with the flow rate. Constant heat flux was applied at the pipe wall through electrical heating and the wall temperature was obtained by thermocouples. In low Reynolds number turbulent region (Re between 1800 and 4200), the mean heat transfer coefficient and flow resistance were found to be 1.3-1.7 times and 1.6-2.1 times than that of a smooth tube, respectively. However, the heat transfer enhancement effect is most pronounced at lower Re and as the Re increases, this effect becomes weak. Nevertheless, the spontaneous oscillating tapes can be a very promising heat transfer intensification element. This study is a primary investigation attempt and flow-induced oscillations of membrane tapes of different dimensions and the use of multiple membrane tapes are awaited to be studied deeply.



中文翻译:

膜带的流致振动及其对过渡管流传热的影响

流动引起的振荡是增强传热的有效方法,它具有不需要额外的能量消耗和防止结垢或烟灰形成的更好性能的优点。在本研究中,将长度,宽度和厚度分别为90 mm,3.8 mm和13.3 um的薄膜胶带安装在内径为13 mm的水平管内。通过视觉测量,证明了带能够在气流中振荡,并且发现振荡频率随流速增加。通过电加热在管壁上施加恒定的热通量,并通过热电偶获得管壁温度。在低雷诺数湍流区(Re(在1800和4200之间),平均传热系数和流动阻力分别是光滑管的1.3-1.7倍和1.6-2.1倍。然而,在较低的Re下传热增强效果最明显,并且随着Re的增加,该效果变弱。然而,自发振荡带可以是非常有希望的传热增强元件。这项研究是一项初步的研究尝试,并且不同尺寸的膜带的流动引起的振动以及多膜带的使用尚待深入研究。

更新日期:2021-02-24
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