The principles of heat transfer enhancement in the core flow of tube have been proposed to improve the temperature uniformity and reduce flow resistance, which is different from that of heat transfer enhancement in the boundary flow of tube. Helical twisted tape inserts with four different widths (w = 7.5mm, 12mm, 15mm and 20mm) have been investigated for different inlet volume-flow rates ranging from 200L/h to 500L/h. A three-dimensional turbulence analysis of heat transfer and fluid flow is performed by numerical simulation. The simulation results show that the average overall heat transfer coefficients in circular plain tubes are enhanced with helical twisted tape of different widths by as much as 220∼390% at a constant tube-side temperature and the friction factor are enhanced by as much as 50% to 790%. The PEC value of the helical twisted tape inserts of different width varies between 1.60 and 3.15. Physical quantity synergy analysis is also performed. The synergy angles α, β, γ and θ are calculated, and the numerical results verify the synergy regulation among physical quantities of fluid particle in the flow field of convective heat transfer, which can guide the optimum design for better heat transfer units and high-efficiency heat exchangers.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4937-8
PROCEEDINGS PAPER
Numerical Studies on Heat Transfer and Friction Factor Characteristics of a Tube Fitted With Helical Twisted Tape Without Core-Rod Inserts
Zhichun Liu,
Zhichun Liu
Huazhong University of Science and Technology, Wuhan, HuBei, China
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Xiaoyu Zhang,
Xiaoyu Zhang
Huazhong University of Science and Technology, Wuhan, HuBei, China
Search for other works by this author on:
Wei Liu
Wei Liu
Huazhong University of Science and Technology, Wuhan, HuBei, China
Search for other works by this author on:
Zhichun Liu
Huazhong University of Science and Technology, Wuhan, HuBei, China
Xiaoyu Zhang
Huazhong University of Science and Technology, Wuhan, HuBei, China
Wei Liu
Huazhong University of Science and Technology, Wuhan, HuBei, China
Paper No:
IHTC14-22494, pp. 539-545; 7 pages
Published Online:
March 1, 2011
Citation
Liu, Z, Zhang, X, & Liu, W. "Numerical Studies on Heat Transfer and Friction Factor Characteristics of a Tube Fitted With Helical Twisted Tape Without Core-Rod Inserts." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 2. Washington, DC, USA. August 8–13, 2010. pp. 539-545. ASME. https://doi.org/10.1115/IHTC14-22494
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