Imperial College London
Alternate

prof paul f. luckham

Faculty of Engineering, Department of Chemical Engineering

Professor in Particle Technology
 
 
 
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Contact

 

+44 (0)20 7594 5583p.luckham01 Website

 
 
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Assistant

 

Miss Jessica Baldock +44 (0)20 7594 5699

 
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Location

 

104Roderic Hill BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ekanem:2022:10.1007/s11242-022-01790-8,
author = {Ekanem, EM and Berg, S and De, S and Fadili, A and Luckham, P},
doi = {10.1007/s11242-022-01790-8},
journal = {Transport in Porous Media},
title = {Towards predicting the onset of elastic turbulence in complex geometries},
url = {http://dx.doi.org/10.1007/s11242-022-01790-8},
volume = {143},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Flow of complex fluids in porous structures is pertinent in many biological and industrial processes. For these applications, elastic turbulence, a viscoelastic instability occurring at low Re—arising from a non-trivial coupling of fluid rheology and flow geometry—is a common and relevant effect because of significant over-proportional increase in pressure drop and spatio-temporal distortion of the flow field. Therefore, significant efforts have been made to predict the onset of elastic turbulence in flow geometries with constrictions. The onset of flow perturbations to fluid streamlines is not adequately captured by Deborah and Weissenberg numbers. The introduction of more complex dimensionless numbers such as the M-criterion, which was meant as a simple and pragmatic method to predict the onset of elastic instabilities as an order-of-magnitude estimate, has been successful for simpler geometries. However, for more complex geometries which are encountered in many relevant applications, sometimes discrepancies between experimental observation and M-criteria prediction have been encountered. So far these discrepancies have been mainly attributed to the emergence from disorder. In this experimental study, we employ a single channel with multiple constrictions at varying distance and aspect ratios. We show that adjacent constrictions can interact via non-laminar flow field instabilities caused by a combination of individual geometry and viscoelastic rheology depending (besides other factors) explicitly on the distance between adjacent constrictions. This provides intuitive insight on a more conceptual level why the M-criteria predictions are not more precise. Our findings suggest that coupling of rheological effects and fluid geometry is more complex and implicit and controlled by more length scales than are currently employed. For translating bulk fluid, rheology determined by classical rheometry into the effective behaviour in complex porous geometries re
AU  - Ekanem,EM
AU  - Berg,S
AU  - De,S
AU  - Fadili,A
AU  - Luckham,P
DO  - 10.1007/s11242-022-01790-8
PY  - 2022///
SN  - 0169-3913
TI  - Towards predicting the onset of elastic turbulence in complex geometries
T2  - Transport in Porous Media
UR  - http://dx.doi.org/10.1007/s11242-022-01790-8
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000799430600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://link.springer.com/article/10.1007/s11242-022-01790-8
UR  - http://hdl.handle.net/10044/1/97895
VL  - 143
ER  -
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