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Absolute instability in curved liquid jets

Bassi, Rachan (2011)
Ph.D. thesis, University of Birmingham.

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We present a study of absolute instability in liquid jets paying particular attention to curved jets formed in the industrial process of prilling. We illustrate the different types of break-up modes identified in experiments on curved jets and also explain the mathematical model used to describe them. Using this mathematical model, we study absolute instability in curved jets undergoing Mode 4 type break-up. The study is extended by including the effects of the density ratio of the liquid to the surrounding gas and gravity. We carry out an experimental study on curved liquid jets concentrating on the Mode 4 break-up regime. Our theoretical results are compared with experiments and very good agreement is found between the two. In addition, we examine absolute instability in thin ligaments that are formed as the jet approaches break-up. This study indicates that the jet undergoes a local absolute instability at pinch-off around its break-up point. A brief investigation of absolute instability in curved non-Newtonian jets is also carried out finding parameters corresponding to convective and absolute instabilities. We also look at jets on very small scales (having radius of the order of micrometers and nanometers) using the interface formation model. The results obtained by using the interface formation model are compared to the classical continuum model and molecular dynamics simulations.

Type of Work:Ph.D. thesis.
Supervisor(s):Decent, Stephen P and Simmons, Mark J. H.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mathematics
Subjects:QA Mathematics
Institution:University of Birmingham
ID Code:1654
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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