Effects of rotating direction of spiral deflector on heat transfer performance of helical copper tube heat exchanger

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (23) : 151-158.

JI Jiadong1,NI Xuwang1,ZHANG Jingwei1,LI Feiyang2,CHEN Qinghua1

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Abstract

In order to obtain helical copper tube (HCT) heat exchanger with higher comprehensive heat transfer performance, two kinds of heat exchangers with different flow diversion schemes were proposed: SSD-HCT (the spiral deflector (SD) and HCT have the same spiral direction) heat exchanger and OSD-HCT (the SD and HCT have opposite spiral direction) heat exchanger. Based on the bidirectional fluid solid interaction calculation method, the effects of SD rotation direction on the vibration-enhanced heat transfer performance of HCT and the comprehensive heat transfer performance of heat exchanger were studied. The results show that for the SSD-HCT heat exchanger, the heat transfer performance of HCT is poor and the outlet temperature of shell side fluid is lower. This is because the shell side fluid sweeps the HCTs longitudinally, making the field synergy angle close to 90°. For the OSD-HCT heat exchanger, the heat transfer performance of HCT is better and the outlet temperature of shell side fluid is higher. This is because the shell side fluid sweeps the HCTs transversely, making the field synergy angle smaller. The vibration-enhanced heat transfer performance of HCTs is obvious when the SD and HCT are arranged in the same spiral direction, and the vibration-enhanced heat transfer performance of HCTs is not obvious when the SD and HCT are arranged in opposite spiral direction. In addition, the comprehensive vibration enhanced heat transfer capacity of the heat exchanger decreases with the increase of the flow rate. And also, the comprehensive vibration enhanced heat transfer capability of the SSD-HCT heat exchanger is higher than that of the OSD-HCT heat exchanger.

Key words

Heat exchanger / Spiral copper tube / Vibration enhances heat transfer / Deflector / Rotation

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JI Jiadong1,NI Xuwang1,ZHANG Jingwei1,LI Feiyang2,CHEN Qinghua1. Effects of rotating direction of spiral deflector on heat transfer performance of helical copper tube heat exchanger[J]. Journal of Vibration and Shock, 2023, 42(23): 151-158

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