Imperial College London

Emeritus ProfessorGeoffreyHewitt

Faculty of EngineeringDepartment of Chemical Engineering

Emeritus Professor
 
 
 
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Contact

 

+44 (0)20 7594 5562g.hewitt

 
 
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Assistant

 

Mrs Sarah Payne +44 (0)20 7594 5567

 
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Location

 

507aACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Zadrazil:10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820,
author = {Zadrazil, I and Markides, CN and Matar, OK and Naraigh, LO and Hewitt, GF},
doi = {10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820},
publisher = {Begell House},
title = {Characterisation of Downwards Co-Current Gas-Liquid Annular Flows},
url = {http://dx.doi.org/10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820},
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - The hydrodynamic characteristics of downwards co-current two-phase (gas-liquid) flows inside avertical tube (ID = 32 mm) have been investigated experimentally. Advanced optical techniques, namely LaserInduced Fluorescence and Particle Tracking Velocimetry, were utilised for the characterisation of these flowsover a wide range of gas and liquid superficial velocities (U_G = 0 – 34 m/s and U_L = 0.034 – 0.182 m/s),corresponding to Reynolds numbers Re_G = 0 – 84,600 and Re_L = 1,230 – 6,130. A flow regime map, whichcontains a previously unreported flow regime, is constructed based on the flow observations. The quantitativeanalysis of the liquid films allows the generation of film thickness, wave frequency, bubble size, bubblefrequency and velocity profile data. It was found that the different observed flow regimes posses a characteristiccombination of the investigated quantitative parameters. A model, based on modified mixing-length theory, wasused to predict the liquid film velocity profiles and good agreement was found with the experimental results.
AU - Zadrazil,I
AU - Markides,CN
AU - Matar,OK
AU - Naraigh,LO
AU - Hewitt,GF
DO - 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820
PB - Begell House
TI - Characterisation of Downwards Co-Current Gas-Liquid Annular Flows
UR - http://dx.doi.org/10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.820
ER -