Residence time distribution in twisted pipe flows: helically coiled system and chaotic system

Castelain, Cathy; Mokrani, Adnane; Legentilhomme, P.; Peerhossaini, Hassan

doi:10.1007/s003480050061

Cited by 74 publications

(53 citation statements)

References 34 publications

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“…Similar results were obtained by Zheng and Mackley [18] by investigating the performance of a ∼10-meters long mesoscale OFR with U-bends using the plug flow with axial dispersion model. RTDs in helically coiled and chaotic twisted pipes have been modelled, by comparing mixing in both configurations by means of a two-measurement point technique using the axial dispersion plug flow model [19].…”

Section: Introductionmentioning

confidence: 99%

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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“…The advantages offered by a chaotic geometry used as a mixer and/or heat exchanger have been established in previous studies [4][5][6][7][8] when compared with a straight pipe or helically coiled pipe. Habchi et al [9] studied the dispersion process (liquid / liquid), related to the mixing of immiscible fluids, in two types of geometries: helically coiled pipe and twisted pipe (chaotic geometry).…”

Section: Introductionmentioning

confidence: 98%

Numerical study of the chaotic flow in three-dimensional open geometry and its effect on the both fluid mixing and heat performances

Boukhalkhal¹,

Lasbet²,

Makhlouf³

et al. 2017

IJHT

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In this study, we investigate the chaotic behavior of fluid particles in three-dimensional open geometries and their effects on the amelioration of miscible fluids mixing, thermal homogenization and thermal performances by using a computational fluid dynamics (CFD) method. Three geometry configurations (straight channel, serpentine-2D channel and chaotic geometry channel serpentine-3D) are considered. The dispersion phenomena are characterized through the presentation of the Poincaré sections and the mixing quality is quantified by calculating the mixing degree in cross section for several Reynolds numbers ranging from 5 to 200. This study reveals that height capacities in terms of mixing and heat performances are obtained by the chaotic geometry where the level mixing is superior to 0.95 for Reynolds equal to 200. In addition, the heat transfer in the S-3D is highly improved where the mean Nusselt number is 13 times bigger than that calculated in the straight channel.

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“…This theory was validated with a model and a real product at the industrial scale [2], as well as being patented. However, others publications deal with geometrical modification of the whole exchanger in order to generate hydrodynamic instabilities in the laminar flow, e.g., chaotic advection [3][4][5][6]. Harion [6] reported mixing and heat transfer increases in a tube with alternate successive deformations.…”

Section: Introductionmentioning

confidence: 99%

“…1.2, for Re < 3000 1) . Castelain [3] has investigated the efficiency of a chaotic advection regime in a twisted duct flow. A configuration representing a three-dimensional steady open flow, consisting of helical and chaotic mixers composed of identical bends, was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Residence Time Distribution in Tubular Joule Effect Heaters with and without Geometric Modifications

André

Boissier

Fillaudeau³

2006

Chem Eng & Technol

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In the food industry, heat treatment of highly viscous fluids in continuous processes is becoming more and more common, and the process should perform as a homogenous thermal treatment, in order to ensure quality and safety of the final product. To improve treatment homogeneity, geometric modifications can be used even in the laminar regime, to induce flow perturbation and mixing. The objectives of this work include: (i) Investigation of the residence time distribution (RTD) for industrial indirect Joule effect heaters (JEH), with smooth (ST) and modified (MT) tubes, (ii) Demonstration and quantification of the efficiency of the geometrical modifications, and (iii) Proposition of a single semi-empirical model including the flow regime (10 < Re < 2000) and tube diameters (18 and 23 mm). The results obtained confirm that the simple Dispersed Plug Flow (DPF) model is not adaptable to small Reynolds numbers. Further analysis demonstrates that certain geometrical modifications improve the treatment homogeneity by increasing the plug flow contribution and reducing the value of the reduced variance. These beneficial effects increase when the Reynolds number is increased, the nominal diameter is reduced, and modified tubes are used. The proposed model enables the prediction of the RTD in JEH with an accurate degree of confidence.

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Residence time distribution in twisted pipe flows: helically coiled system and chaotic system

Cited by 74 publications

References 34 publications

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Numerical study of the chaotic flow in three-dimensional open geometry and its effect on the both fluid mixing and heat performances

Residence Time Distribution in Tubular Joule Effect Heaters with and without Geometric Modifications

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