Boger fluid flow through hyperbolic contraction microchannels

Campo-Deaño, L; Galindo-Rosales, FJ; Oliveira, MSN; Alves, MA; Pinho, FT; 3rd Micro and Nano Flows Conference (MNF2011)

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/6731

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DC Field	Value	Language
dc.contributor.author	Campo-Deaño, L	-
dc.contributor.author	Galindo-Rosales, FJ	-
dc.contributor.author	Oliveira, MSN	-
dc.contributor.author	Alves, MA	-
dc.contributor.author	Pinho, FT	-
dc.contributor.author	3rd Micro and Nano Flows Conference (MNF2011)	-
dc.date.accessioned	2012-09-24T14:59:08Z	-
dc.date.available	2012-09-24T14:59:08Z	-
dc.date.issued	2011	-
dc.identifier.citation	3rd Micro and Nano Flows Conference, Thessaloniki, Greece, 22-24 August 2011	en_US
dc.identifier.isbn	978-1-902316-98-7	-
dc.identifier.uri	http://bura.brunel.ac.uk/handle/2438/6731	-
dc.description	This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.	en_US
dc.description.abstract	Boger fluids are characterized by their constant viscosity and elasticity and are very useful to study pure elastic flow behavior. In this paper we assess the potential of a microfluidic hyperbolic contraction as a device to measure the relaxation time of low viscosity polymer solutions, which are difficult to characterize in a conventional capillary break-up extensional rheometer. For this purpose we initially characterize the shear and extensional rheology of aqueous solutions of polyacrylamide (PAA) at different concentrations (400, 250, 125 and 50 ppm) with 1% (w/w) of NaCl, which result in low viscosity Boger fluids. Subsequently, flow visualizations of their flow through a microfluidic hyperbolic contraction were carried out in order to quantify the relation between their degree of elasticity and the vortex growth upstream of the microchannel.	en_US
dc.description.sponsorship	Fundação para a Ciência e a Tecnologia (FCT), COMPETE and FEDER through projects PTDC/ EQU-FTT/ 71800/2006, PTDC/EQUFTT/ 70727/2006, PTDC/EME-MFE/099109/ 2008, REEQ/928/EME/2005 and REEQ/298/EME/2005.	en_US
dc.language.iso	en	en_US
dc.publisher	Brunel University	en_US
dc.subject	Boger fluids	en_US
dc.subject	Rheology	en_US
dc.subject	Contraction-expansion flow	en_US
dc.subject	Relaxation time	en_US
dc.title	Boger fluid flow through hyperbolic contraction microchannels	en_US
dc.type	Conference Paper	en_US
Appears in Collections:	Brunel Institute for Bioengineering (BIB) The Brunel Collection

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