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Hydrodynamic cavitation: a bottom-up approach to liquid aeration

DSpace at IIT Bombay

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Title Hydrodynamic cavitation: a bottom-up approach to liquid aeration
 
Creator RAUT, JS
STOYANOV, SD
DUGGAL, C
PELAN, EG
ARNAUDOV, LN
NAIK, VM
 
Subject CONVERGING-DIVERGING NOZZLE
SACCHAROMYCES-CEREVISIAE
TRICHODERMA-REESEI
FLOWS
 
Description We report the use of hydrodynamic cavitation as a novel, bottom-up method for continuous creation of foams comprising of air microbubbles in aqueous systems containing surface active ingredients, like proteins or particles. The hydrodynamic cavitation was created using a converging-diverging nozzle. The air bubble size obtained using this technique was found to be significantly smaller than that achieved using conventional mechanical entrapment of air via shearing or shaking routes, which are in essence top-down approaches. In addition, the technique provided the possibility of forming non-spherical bubbles due to the high elongational stresses experienced by the bubbles as they flow through the nozzle throat. We show that surface active agents with a high surface elasticity modulus can be used to stabilize the nascent air bubbles and keep their elongated shapes for prolonged periods of time. This combination of the cavitation process with appropriate surface active agents offers an opportunity for creating bubbles smaller than 10 microns, which can provide unique benefits in various applications.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-10-15T11:59:18Z
2014-10-15T11:59:18Z
2012
 
Type Article
 
Identifier SOFT MATTER, 8(17)4562-4566
http://dx.doi.org/10.1039/c2sm07330g
http://dspace.library.iitb.ac.in/jspui/handle/100/14848
 
Language en