Turbulence structure and budgets in curved pipes

Liberto, Massimiliano Di; Piazza, Ivan Di; Ciofalo, Michele

doi:10.1016/j.compfluid.2013.09.028

Cited by 26 publications

(11 citation statements)

References 35 publications

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“…It is one of the latest developments in a long suite of finite volume CFD codes which have successfully been applied through the years by the authors' research group to a variety of fluid dynamics problems, including laminar, transitional and turbulent flow in curved pipes [10,11,29].…”

Section: Methodsmentioning

confidence: 99%

Fully developed laminar flow and heat transfer in serpentine pipes

Ciofalo

Liberto

2015

International Journal of Thermal Sciences

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Section: Methodsmentioning

confidence: 99%

Fully developed laminar flow and heat transfer in serpentine pipes

Ciofalo

Liberto

2015

International Journal of Thermal Sciences

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“…Recently, direct numerical simulation (DNS) of fluid flow through curved and helically curved pipes were performed to gain a better understanding of the complex phenomena in this flow system (Ciofalo et al, 2014;Di Liberto et al, 2013;Di Piazza and Ciofalo, 2011;Friedrich, 2001, 2000;Noorani et al, 2013). Specifically, it was found that due to centrifugal forces, the velocity maximum is deflected to the outer side of the bend, and the effect increases with the curvature.…”

Section: Fluid Motion In Coiled Tubesmentioning

confidence: 99%

Mechanistic understanding of size-based fiber separation in coiled tubes

Redlinger-Pohn

Jagiello

Bauer

et al. 2016

International Journal of Multiphase Flow

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Understanding separation of poly-disperse particle suspensions according to the particles size is of great importance to product quality. Previous experimental studies of suspension flow through coiled tubes report different results for spherical and elongated particles, e.g., larger and thus heavier elongated particles are faster than smaller ones. We use Euler-Lagrange simulations, as well as experiments, to measure the residence time distribution of fibres with different size in coiled tubes with different curvatures. Fluid flow through the coiled tubes was simulated as toroidal flow, i.e., the pitch of the tube was neglected. Fibres are one-way coupled to the fluid, and their movement in the cross section, as well as their orientation is predicted based on the assumption of an infinitely dilute suspension. We find that in coiled, dilute suspension flow of fibres the ratio of particle settling velocity to the secondary flow speed determines the fibre motion in the tube cross section. For low Reynolds number and thus larger effect of gravitation, fibres are found to concentrate in distinct orbits. Long fibres form flocs propagating through the torus whilst small fibres are well mixed and thus retained in the tube. We found that fibre-fibre interaction and the formation of flocs and not fibre-fluid interaction is key to the size based separation.

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“…en donde δ = r / R es un factor que viene dado por el cociente entre el radio del tubo r = d/2 y el radio de la hélice R (ver Figura 1). Bajo régimen turbulento monofásico y helicoidal (Di Liberto et al, 2013), se constata que la influencia de los vórtices de Dean en el plano transversal va quedando más focalizada a la zona más interior de la hélice a medida que nos separamos del Re crit , quedando el resto de la sección con una estructura menos ordenada que la ya presentada bajo flujo laminar (ver Figura 2.III). En lo que respecta a los perfiles de velocidad (ver Figura 2.IV), se observan ciertas diferencias a los mostrados bajo régimen laminar (Figura 2.II), siendo más "afilados" en los extremos y más lineales en la parte central.…”

Section: Introductionunclassified

Un estudio sobre el rendimiento de separación de tubos helicoidales aplicados a flujos bifásicos de agua y aceite de oliva

Vallesquino¹,

Molina²

2019

ing.agua

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<p>Los estudios sobre flujos bifásicos de agua y aceite, desarrollados con separadores helicoidales, no son numerosos y parecen estar restringidos, actualmente, a la industria petroquímica. El presente trabajo ha sido realizado para estudiar el comportamiento de estos dispositivos cuando son empleados con dispersiones de agua y aceite de oliva a diferentes concentraciones. A tal fin, se han construido dos modelos experimentales para analizar los rendimientos de separación alcanzados bajo diferentes condiciones de funcionamiento. Se han tenido en cuenta variables como el número de Reynolds, las pérdidas de carga o la relación entre flujos descargados para determinar su rango óptimo de operación. Los resultados obtenidos indican que en sistemas de agua-aceite de oliva es posible obtener rendimientos de separación cercanos al 100% con tuberías de diámetro pequeño, radios de hélice reducidos y bajos requerimientos energéticos. Este hecho abre una vía para diseñar estos dispositivos desde otros puntos de vista.</p>

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Turbulence structure and budgets in curved pipes

Cited by 26 publications

References 35 publications

Fully developed laminar flow and heat transfer in serpentine pipes

Fully developed laminar flow and heat transfer in serpentine pipes

Mechanistic understanding of size-based fiber separation in coiled tubes

Un estudio sobre el rendimiento de separación de tubos helicoidales aplicados a flujos bifásicos de agua y aceite de oliva

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