Abonnement à la biblothèque: Guest
Page d'accueil ICHMT DL Année en cours Archives Comité de direction Centre international pour le transfert de chaleur et de masse

On the use of Launder-Sharma k − ε model to simulate drag reduction phenomenon in turbulent pipe flows

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2380
8 pages

Kayvan Sadeghy
School of Mechanical Engineering, College of Engineering, University of Tehran, Center of Excellence in Design and Optimization of Energy Systems (CEDOES), Tehran, Iran

M. Allahdadi Mehrabadi
University of Tehran, College of Engineering, Department of Mechanical Engineering, Tehran, Iran

Résumé

Until recently, theoretical studies have failed to quantitatively predict the huge reduction in the friction drag as witnessed in turbulent pipe and duct flows through the use of certain high-molecular-weight polymeric additives. Pinho (2003) modified the Generalized Newtonian Fluid (GNF) model in such a way that it could take into account a fluid's elasticity. When combined with the low-Reynolds k − ε turbulence model of Nagano-Hishida (1987), numerical predictions could predict, even quantitatively, the drag reduction phenomenon for several polymeric additives. But for certain other polymers the predictions were not so great. In the present work, it will be shown that for the cases where the Nagano-Hishida model performs poorly, better predictions can be obtained using Launder-Sharma k − ε model. The work clearly shows that the selection of the turbulence model plays a crucial role when simulating turbulent flows of viscoelastic fluids.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH