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

Relaminarisation mechanism of the turbulent Couette flows at high Reynolds numbers under a stable system rotation

DOI: 10.1615/ICHMT.2015.THMT-15.680
pages 351-354

Koji Fukudome
Department of Mechanical Engineering, Ritsumeikan University, Noji-higashi 1-1-1, Kusatsu-shi, Shiga, Japan

Yoshifumi Ogami
Department of Mechanical Engineering Ritsumeikan University 1-1-l Nojihigashi, Kusatsu, Shiga, 525-8577 Japan

Résumé

Direct numerical simulation was performed to study the turbulent structure of Couette flow at high Reynolds numbers under a stable system rotation. To compare the flow structure, the same friction Reynolds number flow without a rotation is also calculated. A stable system rotation makes the flow relaminarising, and turbulent stripes are observed near the walls. These stripes move independently of each other and are separated by homogeneous turbulence at the channel centre. Turbulent energy is strongly produced and dissipated in the homogeneous turbulence away from the wall; therefore, an improvement in heat transfer could be realised.

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