Experimental and numerical study of the laminar flow in helically coiled pipes

Amicis, Jacopo De; Cammi, Antonio; Colombo, Luigi Pietro Maria; Colombo, Marco; Ricotti, Marco Enrico

doi:10.1016/j.pnucene.2014.05.019

Cited by 32 publications

(20 citation statements)

References 26 publications

(28 reference statements)

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“…Cioncolini and Santini 8 and Hayamizu et al 9 experimentally clarified the curvature and torsion effect on the flow in helical pipes from laminar to turbulent flow, respectively. Gupta et al, 10 Pimenta and Campos, 11 and Amicis et al 12 all measured the pressure drop for helical pipe under laminar flow condition. However, Gupta et al 10 applied the experimental data to obtain a new fiction factor correlation, Pimental and Campos 11 employed them to analyze the fiction factor of non-Newtonian fluids, and Amicis et al 12 used them as a comparison group to compare with calculation results from different codes.…”

Section: Introductionmentioning

confidence: 99%

“…Noorani et al 20 obtained the characteristics such as fluctuations, Reynolds stress budgets for turbulent flow in both straight and curved pipes using DNSs. Amicis et al 12 illustrated differences among various numerical codes (FLUENT, OpenFOAM, and COMSOL) when they were applied to describe the effect of geometry on coiled pipe flow. Pan et al 21 calculated the oscillating flow in helical pipe under laminar condition.…”

Section: Introductionmentioning

confidence: 99%

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A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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Flow characteristics and loss mechanism inside the helical pipe with large-caliber and large-scale Dean number were analyzed in this study. Numerical simulation was carried out for exploring velocity distribution, pressure field, and secondary flow by varying coil parameters such as Dean number, curvature radius, and coil pitch. The velocity gradient in the cross-section increases along the pipe and causes unsteady flow in the pipe. Large pressure differences in the 180°and 315°cross-section generate centrifugal forces on the pipe. The secondary flow is the major factor resulting in flow loss, presented obviously by the streamlines to analyze the effects of pipe parameters on the vortices. The vortex center shifts toward the upper wall with the increase in Dean number and takes a slight deflection with the increase in coil pitch. Meanwhile, a correlation of the flow loss extent inside the pipe as a function of friction factor was presented. The increases in curvature radius and coil pitch can diminish the friction factor to reduce flow losses. The accuracy of the numerical methodology was also validated by conducting corresponding experiments and empirical mathematical analysis. The maximum deviation between the experimental values and the simulated results of the pressure drop is just 2.9%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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“…The present results, together with comparisons with experiments made in Gelfgat (2019), confirm this conclusion for a nonzero torsion. At smaller curvatures < 0.01, the experimentally observed instability corresponds to a bypass transition similarly to the straight pipe (Sreenivasan & Strykowski, 1983;Cioncilini & Santini, 2006;De Amicis et al, 2014). Thus, studying the flow in a helical pipe with a gradually decreasing/increasing curvature may shed more light in physics of the bypass transition characteristic for the straight pipes and other shear flows.…”

Section: Discussionmentioning

confidence: 96%

A comparative study on instability of steady flows in helical pipes

Gelfgat

2020

Fluid Dyn. Res.

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A parametric numerical study of three-dimensional instability of steady flows in a helical pipe of arbitrary curvature and torsion is carried out. The computations are performed by a numerical approach verified against independent experimental and numerical results in a previous study.The results are reported as dependences of the critical Reynolds number, critical wavenumber and the critical frequency on the dimensionless pipe curvature and torsion. A multiplicity of different disturbance modes becoming most unstable at different values of the governing parameters, is observed. Patterns of the most unstable modes are reported and classified. Different routes to instability including viscous and inviscid mechanisms, locally developing boundary and mixing layers, interaction between the Dean vortices and the through flow are described.

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“…Besides, the rate of heat transfer increases compared to the straight pipe caused by the increased mixing of flow generated by the secondary flow. Dean vortices [8] The variations in the local Nusselt number along the length and diameter of the helical pipes were observed and analyzed [16]. In addition to the effect of varying geometrical parameters on the rate of heat transfer, numerical simulation analysis of the fluid flows was also conducted by changing these parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

Hasan

2020

DJES

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Nanofluid materials play an important role in the industry nowadays, which has drawn the attention of researchers to enhance the characteristics of the heat transfer of the fluids in the coiled shape heat exchangers. The effect of using Al2O3/water Nano fluid on the characteristic of the heat transfer rate inside the helically coiled pipe was numerically studied at different Reynolds numbers. Moreover, fluid flow analyses were investigated numerically in terms of pressure and velocity profile. The heat transfer enhancement using this Nano fluid has been studied and then compared to pure water at Reynolds number values of 200, 600, and 1500 respectively. The results showed that a reduction in the temperature of the outer wall pipe when Al2O3/water Nano fluid was applied particularly at a low Reynolds number compared to pure water. Generally speaking, it has been seen that the reduction in the temperature profile is much better than the high Reynolds number.

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Experimental and numerical study of the laminar flow in helically coiled pipes

Cited by 32 publications

References 26 publications

A numerical study of flow characteristics in a helical pipe

A numerical study of flow characteristics in a helical pipe

A comparative study on instability of steady flows in helical pipes

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

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