THERMAL SCIENCE

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Authors of this Paper

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Zhiqun Zheng

,

Fayi Yan

,

Lei Shi

NUMERICAL STUDY ON HEAT TRANSFER AND FLOW RESISTANCE CHARACTERISTICS OF MULTI-HEAD TWISTED SPIRAL TUBE

ABSTRACT
A numerical calculation model of multihead twisted spiral tube was established. In the range of Reynolds number from 5000 to 35000, the influence of different twisted structure on the flow and heat transfer characteristics of the multihead twisted spiral tube was studied by numerical calculation. Numerical calculation results indicate that the Nusselt number and friction coefficient increase with the increase in the ratio of outside and inside diameter of the cross-section, the increase in the number of twisted nodes, and the increase in the number of twisted spiral tube heads. Under the condition of the same spiral structure and the same hydraulic diameter, the heat transfer performance of the multihead twisted spiral tube is better than that of the spiral smooth tube. In addition, through artificial neural network analysis, the ratio of outside and inside diameter of the cross-section, number of twisted nodes, and the number of twisted spiral tube heads were optimized to promote the comprehensive heat transfer performance. The performance evaluation criterion is the highest when the ratio of outside and in-side diameter of the cross-section is 25/22.5, the number of twisted nodes is 3, and the number of twisted spiral tube heads is 3, which is 1.849 of the spiral smooth tube.
KEYWORDS
MTST, heat transfer, numerical simulation, ANN
PAPER SUBMITTED: 2021-02-24
PAPER REVISED: 2021-04-19
PAPER ACCEPTED: 2021-04-27
PUBLISHED ONLINE: 2021-06-05
DOI REFERENCE: https://doi.org/10.2298/TSCI210224206Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [1880 - 1895]
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Numerical study on heat transfer and flow resistance characteristics of multi-head twisted spiral tube

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