Доступ предоставлен для: Guest
Главная ICHMT DL Текущий год Архив Исполнительный Комитет ICHMT


DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.580
pages 765-778

Nabil Bessanane
University of Batna 2

Mohamed Si-Ameur
LESEI Laboratory, Department of Mechanical Engineering, Technology Faculty, University of Batna 2, Algeria

Mourad Rebay
University of Reims Champagne-Ardenne GRESPI / Faculte des Sciences PB 1039, 51687 Reims, France


The problem of thermo mechanical failure in tubes and ducts of nuclear plants has involved large experimental and theoretical investigations in recent years. Among the causes, one can cite thermal fatigue associated with intermittent and instable variations of the thermal field. Indeed, cooling systems of nuclear power plants are subject to temperature fluctuations due to the mixing of hot and cold fluids in the so-called mixing zones. These fluctuations can cause thermal fatigue damage and then alter the optimal functionality of the plants.
We carry out in this study a thermo mechanical study in the T-junction area for mixing a cold with the hot fluid downstream a 90° angle elbow. The geometry consists of a branch pipe connected as a T-junction to a main pipe having a horizontal straight part, an elbow of 90° angle, and a vertical straight part where the branch is connected. High-pressurized water at 613° K flows into the main pipe. The branch pipe discharges an over-pressured water at 703° K.
A comparison of the vorticity field obtained with k−ε turbulence model and Large Eddy Simulation (LES) model has been conducted. It has been shown that the LES model allows tracking correctly high amplitude and frequencies fluctuation of the small scale eddies in the mixing zone. Therefore, this model has been used for conducting a parametric study of the influence of the position of T-junction to the elbow on the thermal stresses induced downstream the junction. The numerical results are analyzed critically and a better T-Junction position is localized.

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