Flow in curved pipes.

Ito, Haruko

doi:10.1299/jsme1987.30.543

Cited by 207 publications

(67 citation statements)

References 1 publication

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“…A number of numerical and experimental works has been performed concerning developing and fully developed flows. The readers are referred to Berger et al, 1 Nandakumar and Masliyah, 2 and Ito 3 for some outstanding reviews on curved duct flows.…”

Section: Introductionmentioning

confidence: 99%

Traveling-wave solutions of the flow in a curved-square duct

2008

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Three-dimensional (3D) calculations of the flow through a curved duct of square cross section are conducted by use of the spectral method. The main concern of this paper is to clarify 3D structures of periodic solutions which have been obtained by two-dimensional (2D) calculations assuming uniformity in the main-flow direction. It is found that traveling-wave solutions are realized by 3D numerical simulations in the parameter region where periodic solutions were obtained by 2D simulations. Exact traveling-wave solutions are obtained by the iteration method from an initial guess given by the time-evolution calculations. The flow patterns of a 3D traveling wave observed in a cross section are very similar to those of 2D periodic solutions.

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Section: Introductionmentioning

confidence: 99%

Traveling-wave solutions of the flow in a curved-square duct

2008

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“…This leads to the onset of secondary flow in which the fluid near the central plane moves outward and the fluid near the walls moves towards the central plane 8,9 . This in turn modifies the axial velocity and increases the flow resistance 10 . This increase in frictional pressure drop was observed by various investigators in the case of flow through helical coils, compared to straight tubes, in similar conditions 11 .…”

Section: Introductionmentioning

confidence: 99%

Flow of Viscoelastic Fluid through a Helical Coil

Sobti¹

2017

Chem.Biochem.Eng.Q.

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The study aims at quantifying the effect of fluid elasticity on frictional pressure drop for the flow of viscoelastic fluid through a helical coil. Aqueous solutions of polyacrylamide (PAA) in the concentration range 0.25 %-0.5 % (wt/vol.) were used as test fluids. The fluids were characterized using dynamic rheometer under rotational and oscillatory modes. The rheological study depicts that the fluids exhibit elasticity and shear thinning behavior. Experimental data on pressure drop for the flow of non-Newtonian viscoelastic fluid through a helical coil have been generated. Drag enhancement was observed for the fluids with significant elastic character. An existing correlation applicable over a wide range of Germano number (N Gn ) for the flow of Newtonian fluids through helical coils (11.7≤D c /d t ≤105.48, 8.3≤p/D t ≤66.7), proposed by Gupta et al. 22, has been extended to non-Newtonian viscoelastic fluids by incorporating the effect of fluid elasticity in terms of Weissenberg number (We). The proposed model's uncertainty has been reported for 95 % confidence to assess the significance of newly reported results. The observed data were compared with the available models in the literature statistically using mean relative quadratic error (MRQE) and arithmetic relative error (%ARE). Lower values of MRQE and %ARE depict the acceptability of the proposed model.

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“…Then the socalled secondary flow takes place in either a clockwise or an anticlockwise sense about the axis [10,11]. These behaviors induce a squeeze effect to the extrados and a suction effect to the intrados.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Instantaneous Turbulent Flow Field in a 90-Degree Elbow Pipe with Circular Section

Wang

Ren

Sun

et al. 2016

Science and Technology of Nuclear Installations

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Based on the special application of 90-degree elbow pipe in the HTR-PM, the large eddy simulation was selected to calculate the instantaneous flow field in the 90-degree elbow pipe combining with the experimental results. The characteristics of the instantaneous turbulent flow field under the influence of flow separation and secondary flow were studied by analyzing the instantaneous pressure information at specific monitoring points and the instantaneous velocity field on the cross section of the elbow. The pattern and the intensity of the Dean vortex and the small scale eddies change over time and induce the asymmetry of the flow field. The turbulent disturbance upstream and the flow separation near the intrados couple with the vortexes of various scales. Energy is transferred from large scale eddies to small scale eddies and dissipated by the viscous stress in the end.

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Flow in curved pipes.

Cited by 207 publications

References 1 publication

Traveling-wave solutions of the flow in a curved-square duct

Traveling-wave solutions of the flow in a curved-square duct

Flow of Viscoelastic Fluid through a Helical Coil

A Study on the Instantaneous Turbulent Flow Field in a 90-Degree Elbow Pipe with Circular Section

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