Vibration-enhanced heat transfer performance analysis of helical elasticcopper tube under swirl condition

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (19) : 1-9.

SUN Yaru1, LI Dequan2, JI Jiadong3, HUA Zisen2

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Abstract

In order to make full use of fluid-induced helical elastic copper tube (HECT) vibration to enhance heat transfer and obtain higher comprehensive heat transfer performance of HECT heat exchanger device, the HECT heat exchanger with forward spiral baffle (HECT-FSB) and the HECT heat exchanger with reverse spiral baffle (HECT-RSB) were proposed. The two way-fluid structure coupling calculation method was adopted to study the effects of inlet velocity (Uin) on vibration-enhanced heat transfer and comprehensive heat transfer performance of HECT under swirling condition. The results show that with the increase of Uin, the amplitude and heat transfer coefficient of the HECT, and the pressure drop of the HECT heat exchanger all increase, while the PEC value decreases. The amplitude and heat transfer coefficient of the HECT, and the pressure drop of the HECT-RSB heat exchanger are significantly higher than those of the HECT-FSB heat exchanger. The PEC value of the HECT-FSB heat exchanger is higher than that of the HECT-RSB heat exchanger, and the vibration-enhanced heat transfer performance is better. When the Uin is 0.3 m/s, the PEC value of the HECT-FSB heat exchanger is 9.00% higher than that of the HECT-RSB heat exchanger. The HECT-RSB heat exchanger has the largest JF factor and the best comprehensive heat transfer performance. Compared with the heat exchanger in the published literature, the JF factor in the calculation range of Uin is increased by 2.7% on average. This research can provide technical support for improving the comprehensive performance of HECT heat exchanger device.

Key words

helical elastic copper tube / comprehensive heat transfer performance / baffle / swirling / vibration-enhanced heat transfer

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SUN Yaru1, LI Dequan2, JI Jiadong3, HUA Zisen2. Vibration-enhanced heat transfer performance analysis of helical elasticcopper tube under swirl condition[J]. Journal of Vibration and Shock, 2024, 43(19): 1-9

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