Pressure drop in alternating curved tubes

Abou-Arab, T.W.; Aldoss, T. K.; Mansour, Awad R.

doi:10.1007/bf01998662

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Viscous dissipations are induced by flow secondary motions that have a complex dependence on the vessel geometry. 1 In particular, the curvature of the bends of the ICA siphon seems to play a role on viscous dissipations. Whilst S-shaped ICAs are expected to be very effective in dissipating the flow energy, X-shaped ICAs would not be as efficient.…”

Section: R Nomentioning

confidence: 99%

An Integrated Statistical Investigation of Internal Carotid Arteries of Patients Affected by Cerebral Aneurysms

Passerini

Sangalli

Vantini

et al. 2011

Cardiovasc Eng Tech

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Cerebral aneurysm formation is the result of a complex interplay of systemic and local factors. Among the latter, the role of the geometry of the vessel hosting an aneurysm, of the upstream vasculature and the induced hemodynamics still need to be carefully investigated. In this paper we combine computational fluid dynamics analysis and morphological characterization and carry out the statistical investigation of the features of the internal carotid artery (ICA) of 52 patients affected by a cerebral aneurysm. The functional principal component analysis performed on the geometric and fluid dynamics features of the patients reveals correlations with the location of the aneurysm in the cerebral circulation and its rupture status. This allows a clustering of the patients that is anticipated to contribute to the design of an index for the rupture risk. In particular, ICA featuring a pronounced WSS peak are statistically inclined to hosting ruptured aneurysms. Moreover, our statistical results suggest that patients with a double-bend siphons (S-class) are less prone to the development of cerebral aneurysms

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Section: R Nomentioning

confidence: 99%

An Integrated Statistical Investigation of Internal Carotid Arteries of Patients Affected by Cerebral Aneurysms

Passerini

Sangalli

Vantini

et al. 2011

Cardiovasc Eng Tech

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“…As flow moves across the curved pipes, the centrifugal force drives the more rapid fluid in the concave part of the curve channel while the fluid in the convex part is slowing down, leading to the occurrence of a secondary [1]. Single-phase flow characteristics in curved channel had been extensively investigated both theoretically and experimentally [2][3][4][5][6]. The magnitude of such secondary flows becomes more conspicuous with a decrease of bend radius, and with an increase of fluid velocity.…”

Section: Introductionmentioning

confidence: 97%

Two-phase pressure drops and flow pattern observations in 90° bends subject to upward, downward and horizontal arrangements

Hsu

Chen

Chyu

et al. 2015

Experimental Thermal and Fluid Science

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“…Unlike the correlation by Abou-Arab [17] (Eq. 6), which is developed for longitudinally sinusoidal pipes with 0.0111 ≤ ≤ 0.71 , showed a max relative error of 9% for the configuration with = 0.2 , and increases as increases giving a value of 13.47% for = 0.6.…”

Section: Resultsmentioning

confidence: 90%

“…Abou-Arab et al [17] developed correlations for sinusoidal tubes, but these correlations are not practical for the C-shaped pipes, as seen in Fig. 7, as well as the correlation by Yang et al [22] not discussed in this paper.…”

Section: Discussionmentioning

confidence: 86%

Comparative numerical study on pressure drop in helically coiled and longitudinally C-shaped pipes

2020

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In the present work, the shear stress transport (SST) k − model is used to simulate internal turbulent flows in curved tubular heat exchangers and the resulting friction factors C f are calculated. A helically coiled configuration was used in the validation process of the model that showed a good agreement between numerical results of the friction factors C f and the standard experimental correlations of the literature, with a maximum relative error of 4.24%. A comparative study was performed to investigate the possibility of applying friction factor correlations, established mainly for helical coils, to longitudinally C-shaped pipes. Preliminary results confirm the inability of coil-specific correlations to predict the friction factor C f inside C-shaped pipes. It was also noted that, unlike helical coils, the C-shaped pipe friction factor appears to be affected by ratios other than the curvature ratio as highlighted in this study by introducing the effect of the amplitude ratio defined as the ratio of the amplitude to the curvature radius. Keywords Pressure drop • Fanning friction factor C f • Helically coiled pipes • Longitudinally C-shaped pipes List of symbols A Amplitude of the C-shaped pipe (m) C f Friction coefficient c p Heat capacity (J kg −1 K −1 ) D i Inner diameter of the pipe (m) f Darcy friction factor Nu Nusselt number Pr Prandlt number Pr t Turbulent Prandtl number R c Curvature radius (m) Re Reynolds number T Temperature (K) u Velocity field (m s −1 )Greek letters Amplitude ratio Curvature ratio Periodicity length (m). Heat conductivity (W K −1 m −2 ) Dynamic viscosity (kg m −1 s −1 )

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Pressure drop in alternating curved tubes

Cited by 13 publications

References 8 publications

An Integrated Statistical Investigation of Internal Carotid Arteries of Patients Affected by Cerebral Aneurysms

An Integrated Statistical Investigation of Internal Carotid Arteries of Patients Affected by Cerebral Aneurysms

Two-phase pressure drops and flow pattern observations in 90° bends subject to upward, downward and horizontal arrangements

Comparative numerical study on pressure drop in helically coiled and longitudinally C-shaped pipes

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