Vibration and heat transfer performances analysis of a hollow helical baffle heat exchanger

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (8) : 251-258.

SUN Yaru1,JI Jiadong2,HUA Zisen1,WANG Chengjun1,WANG Yan1

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Abstract

A hollow helical baffle (HHB) heat exchanger was put forward to balance the vibration performance and improve the heat transfer performance of helical heat transfer element. The fluid-solid coupling method was provided to study the effects of entrance velocity and the installed position of baffle on the performances of vibration and heat transfer. Based on the numerical results, HHB heat exchanger can effectively balance the vibration performance and improve the heat transfer performance. The vibration amplitude and heat transfer coefficient of heat transfer elements increase with the increase of entrance velocity. It is found that when the baffle is installed on the top side of the heat exchanger, the average vibration amplitude is the biggest, the average heat transfer coefficient is the smallest and the heat transfer uniformity is the best. The PEC value of HHB heat exchanger is always bigger than 1 which shows that the HHB heat exchanger has achieved the effect of enhancing heat transfer. When the baffle is installed on the bottom, top, left and right side of HHB heat exchanger, the PEC value of HHB heat exchanger can be increased by 2.04%, 7.87%, 1.32% and 0.03% compared with that of the conventional elastic tube bundle (CETB), respectively. When the baffle is installed on the top side of the HHB heat transfer, the PEC value is the maximum and the comprehensive heat transfer performance is the best.

Key words

heat transfer element / heat exchanger / helical baffle / vibration performance / heat transfer performance

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SUN Yaru1,JI Jiadong2,HUA Zisen1,WANG Chengjun1,WANG Yan1 . Vibration and heat transfer performances analysis of a hollow helical baffle heat exchanger[J]. Journal of Vibration and Shock, 2023, 42(8): 251-258

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