A study on friction factor correlation considering the torsion effect in helical pipe flow

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2025-03-17 DOI:10.1016/j.anucene.2025.111290

Thi Thanh Thuy Nguyen, Thi Huong Vo, Dinh Hung Cao, Nhu Viet Ha Pham

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Abstract

A new correlation of friction factors in helical tubes for fully laminar flow was developed, covering curvature ratios from 0.05 to 0.15 and torsion parameters from 0.91 to 1.90. This correlation was separately analyzed the effects of curvature and torsion through regression analysis of experimental data and numerical results. The correlation was verified using experimental data and discussed on the influences of curvature ratio, torsion parameter, and Reynolds number. The friction factor decreased with a decrease in the curvature ratio and an increase the Reynolds number. At low Reynolds numbers, the friction factor decreased more rapidly compared to higher Reynolds numbers. It is confirmed that the friction factor formula for toroidal tubes was not applicable for torsion parameters exceed 1.0, especially in low Reynolds numbers flow. These findings highlight the importance of torsion effects, especially in large curvature coils, for accurate friction factor and pressure drop predictions.

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.