Experimental study of the flow in a helical circular tube

Yamamoto, Kazuomi; Akita, Tomonari; Ikeuchi, Hideaki; Kita, Yoshinori

doi:10.1016/0169-5983(95)00022-6

Cited by 74 publications

(63 citation statements)

References 17 publications

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“…There is some evidence showing that the occurrence of chaotic or turbulent flow may be predicted by 2D stability analysis for helical pipe flows. 15,16 In this respect, traveling-wave solutions obtained in the present paper may give a first step of the investigation of occurrence of chaotic solutions in the curved-square-duct flow. …”

Section: Conclusion and Discussionmentioning

confidence: 75%

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: Conclusion and Discussionmentioning

confidence: 75%

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

2008

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“…Helical coils are widely used in heat exchangers, chemical reactors and other devices due to enhanced heat and mass transfer coefficients and large transfer area per unit volume [1][2][3][4][5] . The enhancement of heat and mass transfer in coils occur due to the existence of a secondary flow 6,7 .…”

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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“…The latest work is concerned with the pipe flow belonging to Yamamoto and co-workers [7][8][9]. They studied the laminar and turbulent flow through helical coils.…”

Section: Introductionmentioning

confidence: 99%

“…Several other workers investigated the emergence of turbulence region in flow through coiled pipes, both experimentally [8][9][10][11] and numerically [12,13]. The coil curvature seems to increase the value of the Reynolds number required to attain fully turbulence flow.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of Liquid Film in Helical Tubes

Hameed¹,

Jawad²

2012

ACES

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Hydrodynamic experiments on a liquid film are carried out using water in both straight and helical tubes at angles of inclination ranging between 2.5° and 5° and on three different coil diameters (23.86 cm, 32.74 cm and 41.13 cm) for film Reynolds numbers ranging from 100 to 2000. The film thickness is measured by two micrometers, arranged to measure vertical and horizontal distances within the cross section of the tube. The results of film thickness are related to the hydraulic radius to characterize the film flow in both types of tube. Momentum transfer rates are shown to be higher in helical tubes than in the straight incline tube. An empirical correlation is presented for film thickness in the helical tube in terms of <i>NT (coil tube)/NT</i> (straight tube) for film Dean number ranging from 1 to 1000

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Experimental study of the flow in a helical circular tube

Cited by 74 publications

References 17 publications

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

Hydrodynamics of Liquid Film in Helical Tubes

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