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Abstract
This study analyzed the acoustic energy transfer process in expanded pipe of heat exchangers based on the field synergy principle. The synergy between the flow field and the acoustic field was deduced theoretically based on the energy and momentum equations pertaining to the acoustic field. The synergy angle of the flow field and the acoustic field was calculated numerically. The noise propagation process in the expanded pipe was measured experimentally. The results show that the sound pressure level and synergy angle both increase with the increase in flow velocity, whereas the acoustic energy transfer process decreased with the increase in synergy angle. An extended outlet of the expanded pipe segment can reduce the flow noise magnitude with a lower pressure drop. The flow noise can reach 123 dB and the pressure drop is 37.3％ and 24.7％ less than other cases. In conclusion, the theoretical analysis, experimental tests, and numerical simulation method are developed to study the acoustic energy transfer process in segments of expanded pipe based on synergy principle of flow and acoustic fields.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Yiping Cao
Yiping Cao is a Ph.D. student in the School of Energy and Power Engineering, Xi’an Jiaotong University, China, since 2014. She received her bachelor’s degree from Xi’an Jiaotong University, China, in 2014. Her main research interests are the theoretical, numerical, and experimental study of flow noise and heat transfer in shell-and-tube heat exchangers.
Nianqi Li
Nianqi Li is a Ph.D. student in the School of Energy and Power Engineering, Xi’an Jiaotong University, China, since 2018. He received his bachelor’s degree from Beijing University of Chemical Technology, China, in 2015. He received his master’s degree from Xi’an University of Petroleum, China, in 2018. His main research interest is the numerical and experimental study of novel heat transfer enhancement technology.
Hanbin Ke
Hanbin Ke is an engineer in Wuhan Second Ship Design And Research Institute, China, since 2012. He received his Ph.D. degree in Engineering Thermophysics from Xi’an Jiaotong University, China, in 2012. His main research interests are the numerical and experimental investigations on the heat and mass transfer in thermoacoustic technology.
Min Zeng
Min Zeng is a Professor of School of Energy and Power Engineering, Xi’an Jiaotong University. He received his Ph.D. degree in Engineering Thermophysics from Xi’an Jiaotong University in 2004. He was awarded a scholarship from the Swedish Institute from September 1, 2011 to Septemeber 1, 2012 for postdoctoral research at Lund University. He was awarded New Century Excellent Talents in University of China. His main research interests are enhanced heat transfer, compact heat exchangers, solid oxide fuel cell, and numerical heat transfer and transport phenomena in porous media. He has published more than 40 papers in international journals or conferences and was also authorized with two USA and eight China Invention Patents.
Qiuwang Wang
Qiuwang Wang is a Professor in the School of Energy and Power Engineering, Xi’an Jiaotong University, China. He received his Ph.D. in Engineering Thermophysics from Xi’an Jiaotong University, China, in 1996. He then joined the faculty of the university and took the professor post in 2001. His main research interests include computational fluid dynamics and numerical heat transfer, heat transfer enhancement, transport phenomena in porous media, compact heat exchangers, building energy savings, and indoor air quality. He has also been author or coauthor of four books and more than 100 journal papers, and his H-index is 24. He has obtained 16 China Invention Patents and two US Patents.