Investigation on Convection Heat Transfer Augment in Spirally Corrugated Pipe

Xiuzhen Li (), Shijie Liu, Xun Mo, Zhaoyang Sun, Guo Tian, Yifan Xin and Dongsheng Zhu ()
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Xiuzhen Li: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Shijie Liu: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China
Xun Mo: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China
Zhaoyang Sun: School of Information Technology and Urban Construction, Luoyang Polytechnic, Luoyang 471942, China
Guo Tian: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Yifan Xin: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Dongsheng Zhu: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China

Energies, 2023, vol. 16, issue 3, 1-17

Abstract: A numerical simulation on the heat transport augmentation and flow drag behavior of spirally corrugated pipes was performed. The simulation was conducted on the basis of the experimental results documented in the published literature. The influence of the thread height and pitch on the hydraulic–thermal performance as well as the mechanism of the convection heat transport development inside the spirally corrugated pipe were explored. It was discovered that the convection heat transport performance elevates in the Reynolds number region of 4000~13,000 as the thread height rises or the Reynolds number enlarges, but it declines when the thread pitch extends. The convection heat transport performance marked by the Nusselt number of the spirally corrugated pipe could reach 2.77 times that of the plain pipe, while the flow resistance coefficients of spirally corrugated pipes are 89~324% above that of the plain pipe. It enlarges with the rise in thread height but declines with the extension of the thread pitch. It also reduces when the Reynolds number enlarges. The factors of overall heat transmission performance for all the spirally corrugated pipes are above 1.00, and they increase in the Reynolds number region of 4000~7000 and then decrease in the Reynolds number region of 7000 to 13,000. The secondary flow at the cross-sections and the vortex between two adjacent corrugated grooves are the basic causes of the promotion of convection heat transport inside the spirally corrugated pipes. The secondary flow near the pipe wall both disrupts the border layer and boosts the radial interfusion of the fluid. In addition, the existence of vortexes makes the secondary flow act on the convection heat transmission continuously and positively in the region close to the pipe wall.

Keywords: heat transfer enhancement; corrugated tube; twisted tube; turbulent flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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