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<p>In the present study, a novel method was developed to improve heat exchanger performance in response to the growing demand for energy conservation worldwide and the alteration toward more sustainable and effective thermal technologies. This work offers brief and useful advice on a high-efficiency design approach that can enhance the efficacy of heat transfer. The present study aims to numerically examine the thermal and hydraulic characteristics of a new design of helical tubes, referred to as triple helical tubes with corrugated tubes (<i>THTCTs</i>). A three-dimensional computational fluid dynamics (CFD) model was designed and developed via the ANSYS-FLUENT package to predict the thermal and hydraulic characteristics of the <i>THTCT</i>. The k–ε realizable model was applied with enhanced wall treatment to present the fluid behavior. The governing equations were solved via a finite volume discretization method. Four model configurations of the inner and intermediate tubes of the<i>THTCT</i>, including smooth tubes (Model A), inner corrugated tubes only (Model B), intermediate corrugated tubes only (Model C), and inner and intermediate corrugated tubes (Model D), were designed, built, and tested at various curvature ratios of 0.0375, 0.0292, and 0.0219, respectively. The results were carried out at Dean numbers ranging from 500 to 6800, corresponding to Reynolds numbers ranging from 3400 to35000. The results showed that combinations of triple helical tubes with corrugated tubes are highly effective at improving heat transfer rates. Among all the configurations, the Model D configuration exhibited the most favorable thermohydraulic behavior. At a curvature ratio, λ, of 0.0375, the Nusselt number per unit length, <i>Nu</i><sub><i>im</i></sub><i>/L</i>, for Model D exceeded that at curvature ratios of 0.0292 and 0.0219 by 29.27% and 66.9%, respectively, accompanied by adequate increases in the friction factor of 7.53% and 15.4%. Furthermore, the maximum thermal performance indices reached 1.18, 1.15, and 1.11 for Model D at λ values of 0.0219, 0.0292, and 0.0375, respectively.</p>

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Thermohydraulic behavior of the triple helical tube with corrugated tube configurations

  • 期刊论文

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  • 发表日期：

    2026年5月26日

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  • Mahmoud Abdelmagied

摘要

In the present study, a novel method was developed to improve heat exchanger performance in response to the growing demand for energy conservation worldwide and the alteration toward more sustainable and effective thermal technologies. This work offers brief and useful advice on a high-efficiency design approach that can enhance the efficacy of heat transfer. The present study aims to numerically examine the thermal and hydraulic characteristics of a new design of helical tubes, referred to as triple helical tubes with corrugated tubes (THTCTs). A three-dimensional computational fluid dynamics (CFD) model was designed and developed via the ANSYS-FLUENT package to predict the thermal and hydraulic characteristics of the THTCT. The k–ε realizable model was applied with enhanced wall treatment to present the fluid behavior. The governing equations were solved via a finite volume discretization method. Four model configurations of the inner and intermediate tubes of theTHTCT, including smooth tubes (Model A), inner corrugated tubes only (Model B), intermediate corrugated tubes only (Model C), and inner and intermediate corrugated tubes (Model D), were designed, built, and tested at various curvature ratios of 0.0375, 0.0292, and 0.0219, respectively. The results were carried out at Dean numbers ranging from 500 to 6800, corresponding to Reynolds numbers ranging from 3400 to35000. The results showed that combinations of triple helical tubes with corrugated tubes are highly effective at improving heat transfer rates. Among all the configurations, the Model D configuration exhibited the most favorable thermohydraulic behavior. At a curvature ratio, λ, of 0.0375, the Nusselt number per unit length, Nuim/L, for Model D exceeded that at curvature ratios of 0.0292 and 0.0219 by 29.27% and 66.9%, respectively, accompanied by adequate increases in the friction factor of 7.53% and 15.4%. Furthermore, the maximum thermal performance indices reached 1.18, 1.15, and 1.11 for Model D at λ values of 0.0219, 0.0292, and 0.0375, respectively.