𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Numerical study of the turbulent flow in strongly curved stationary and rotating U-ducts

✍ Scribed by K. Melih Guleren

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
906 KB
Volume
64
Category
Article
ISSN
0271-2091

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A large‐eddy simulation (LES) study is undertaken to explore the complex flow of developing turbulent flow through stationary and rotating U‐ducts with strong curvature. Three flow cases are investigated: stationary (non‐rotating), positive and negative rotational cases. Stationary and positive rotational cases are shown to have similar flow characteristics in terms of the mean velocity variations, although the predicted separation zone is nearly doubled in size for positive rotational case. Unlike the positive rotation for which the laminarization effects are observed, turbulence is significantly enhanced for the negative rotation mainly due to the existence of strong secondary flow. Turbulence is found to be highly anisotropic throughout the duct apart from the far downstream regions of the bend for the negative rotational case. The stress–strain relation seems to be completely invalid in the U‐duct apart from the bend region. Copyright © 2009 John Wiley & Sons, Ltd.

📜 SIMILAR VOLUMES

The computation of turbulent flow throug
The computation of turbulent flow through stationary and rotating U-bends with rib-roughened surfaces
✍ H. Iacovides 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 229 KB

This study focuses on the numerical computation of turbulent flow through stationary and rotating U-ducts of square cross-section, with rib-roughened inner and outer walls along the straight sections. Square-sectioned ribs, normal to the flow direction are employed in a staggered arrangement. The ri

Prediction of turbulent gas–solids flow
Prediction of turbulent gas–solids flow in curved ducts using the Eulerian–Lagrangian method
✍ S. Naik; I.G. Bryden 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 230 KB 👁 2 views

The flow of particulate two-phase flow mixtures occur in several components of solid fuel combustion systems, such as the pressurised fluidised bed combustors (PFBC) and suspension-fired coal boilers. A detailed understanding of the mixture characteristics in the conveying component can aid in refin

Effect of turbulent flow on the anodic a
Effect of turbulent flow on the anodic and cathodic kinetics of API X52 steel corrosion in H2S containing solutions. A rotating cylinder electrode study
✍ R. Galvan-Martinez; J. Mendoza-Flores; R. Duran-Romero; J. Genesca 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 German ⚖ 241 KB 👁 2 views

## Abstract This work presents the electrochemical kinetics results measured during the corrosion of API X52 pipeline steel immersed in aqueous environments, containing dissolved hydrogen sulfide (H~2~S) under turbulent flow conditions. In order to control the turbulent flow conditions, a rotating