Methodology to analyse three dimensional droplet dispersion applicable to Icing Wind Tunnels

Show simple item record

dc.contributor.advisor Hammond, David W. Sorato, Sebastiano 2010-05-12T10:09:02Z 2010-05-12T10:09:02Z 2009
dc.description.abstract This dissertation presents a methodology to simulate the dispersion of water droplets in the air flow typical of an Icing Tunnel. It is based on the understanding the physical parameters that influence the uniformity and the distribution of cloud of droplets in the airflow and to connect them with analytical parameters which may be used to describe the dispersion process. Specifically it investigates the main geometrical and physical parameters contributing to the droplets dispersion at different tunnel operative conditions, finding a consistent numerical approach to reproduce the local droplets dynamic, quantifying the possible limits of commercial CFD methods, pulling out the empirical parameters/constant needing to simulate properly the local conditions and validating the results with calibrated experiment. An overview of the turbulence and multiphase flow theories, considered relevant to the Icing Tunnel environment, is presented as well as basic concepts and terminology of particle dispersion. Taylor’s theory of particle dispersion has been taken as starting point to explain further historical development of discrete phase dispersion. Common methods incorporated in commercial CFD software are explained and relative shortcomings underlined. The local aerodynamic condition within tunnel, which are required to perform the calculation with the Lagrangian particle equation of motions, are generated numerically using different turbulent models and are compared to the historical K-ε model. Verification of the calculation is performed with grid independency studies. Stochastic Separated Flow methods are applied to compute the particle trajectories. The Discrete Random Walk, as described in the literature, has been used to perform particle dispersion analysis. Numerical settings in the code are related to the characteristics of the local turbulent condition such as turbulence intensity and length scales. Cont/d. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University, 2009. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. en_UK
dc.subject Lagrangian dispersion en_UK
dc.subject Icing Tunnel en_UK
dc.subject CFD en_UK
dc.subject Discrete phase en_UK
dc.subject Stochastic models en_UK
dc.title Methodology to analyse three dimensional droplet dispersion applicable to Icing Wind Tunnels en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Doctoral en_UK
dc.type.qualificationname PhD en_UK

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search CERES


My Account