Investigation of heat transfer performance and flow characteristic in helically coiled-twisted flat tube

Heat transfer performance and flow characteristics in the Helically Coiled-Twisted Flat Tube (HCTFT) are studied by a numerical simulation. According to the results, the secondary flow caused by the twisted structure destroys the velocity boundary layer, decreases the thermal-conduction resistance,...

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Bibliographic Details
Published in:Experimental heat transfer 2020-07, Vol.33 (5), p.419-439
Main Authors: Peng, Xu, Wang, Dingbiao, Wang, Guanghui, Yang, Yushen, Xiang, Sa
Format: Article
Language:English
Subjects:
Boundary layers
Computational fluid dynamics
Computer simulation
experimental study
Flow characteristics
fluid flow
Heat transfer
Helically coiled-twisted flat tube
Kinetic energy
numerical simulation
Performance evaluation
Secondary flow
Thermal boundary layer
Thermal resistance
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Summary:Heat transfer performance and flow characteristics in the Helically Coiled-Twisted Flat Tube (HCTFT) are studied by a numerical simulation. According to the results, the secondary flow caused by the twisted structure destroys the velocity boundary layer, decreases the thermal-conduction resistance, increase the turbulence kinetic energy. The heat transfer performance of HCTFT is greater than Helically Coiled Smooth Tube (HCST). In the range of research, the Performance Evaluation Criterion (PEC) could achieve the maximum value 1.21, 1.21, 1.35 and 1.23, respectively. New correlations of heat transfer performance and flow characteristics in the tube side are developed.
ISSN:0891-6152
1521-0480
DOI:10.1080/08916152.2019.1656300