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

Characterisation of downwards co-current gas-liquid annular flows

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820
pages 753-764

Ivan Zadrazil
Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK

Christos N. Markides
Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom

Omar K. Matar
Department of Chemical Engineering, Imperial College London, Prince Consort Road, London SW7 2AZf

L. O. Naraigh
School of Mathematical Sciences, University College Dublin, Belfield, Dublin 4, Ireland

Geoffrey F. Hewitt
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK


The hydrodynamic characteristics of downwards co-current two-phase (gas-liquid) flows inside a vertical tube (ID = 32 mm) have been investigated experimentally. Advanced optical techniques, namely Laser Induced Fluorescence and Particle Tracking Velocimetry, were utilised for the characterisation of these flows over a wide range of gas and liquid superficial velocities (UG = 0 − 34 m·s−1 and UL = 0.034 − 0.182 m·s−1), corresponding to Reynolds numbers ReG = 0 − 84,600 and ReL = 1,230 − 6,130. A flow regime map, which contains a previously unreported flow regime, is constructed based on the flow observations. The quantitative analysis of the liquid films allows the generation of film thickness, wave frequency, bubble size, bubble frequency and velocity profile data. It was found that the different observed flow regimes posses a characteristic combination of the investigated quantitative parameters. A model, based on modified mixing-length theory, was used to predict the liquid film velocity profiles and good agreement was found with the experimental results.

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