NDLI: Secondary convection due to second normal stress differences: A new mechanism for the mass transport of solutes in pressure-driven flows of concentrated, non-colloidal suspensions

Content Provider	Royal Society of Chemistry (RSC)
Author	Ramachandran, Arun
Copyright Year	2013
Abstract	A mechanism for enhancement in the mass transfer rates of solutes in flowing, concentrated suspensions that is often cited in the literature is the self-diffusion of particles arising from shear-induced interparticle interactions. Recently, it was demonstrated by Zrehen and Ramachandran (Phys. Rev. Lett., 2013, 110, 018306) that the pressure-driven flow of suspensions through non-axisymmetric geometries is not unidirectional; the main flow is accompanied by secondary currents within the cross-section of the conduit, driven by second normal stress differences. This secondary convection represents a new and heretofore unexplored, advective mechanism for the mass transfer of solutes normal to the primary streamlines in flowing suspensions, and is investigated in this paper via simulations. For small particle sizes, the enhancement of solute diffusivity by shear-induced self-diffusion is weak. However, the magnitude of the secondary currents is unaffected by particle size. Thus, for suspensions with particles much smaller than the conduit size, secondary convection, and not shear-induced self-diffusion, can be the dominant mechanism for shear-induced enhancement of mass transfer. In the limit where shear-induced self-diffusion is the dominant diffusive mode of mass transfer, secondary convection can, for some geometries and conditions, double the augmentation of mass transfer over that expected from self-diffusion alone. The relevance of this new mechanism of mass transfer is in the improved modeling of the transport of solutes for which the dominant mass transfer resistance is in the suspension phase. This mechanism also suggests the possibility of exploiting conduit geometry to improve the mass transfer rate of solutes.
Starting Page	6824
Ending Page	6840
Page Count	17
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	29
Journal	Soft Matter
DOI	10.1039/c3sm50244a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ramachandran Zrehen Convection Self-diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Tensorial rheological model for concentrated non-colloidal suspensions: normal-stress differences

Velocity oscillations in confined channel flows of concentrated colloidal suspensions

Transverse transport of solutes between co-flowing pressure-driven streams for microfluidic studies of diffusion/reaction processes

Mesoscale modeling of colloidal suspensions with adsorbing solutes

Comment on "Constant stress and pressure rheology of colloidal suspensions"

Mechanical aging and non-linear rheology of concentrated colloidal suspensions: experimental facts and simple models

ELECTRICALLY-DRIVEN NATURAL CONVECTION IN COLLOIDAL SUSPENSIONS

Scaling the normal stresses in concentrated non-colloidal suspensions of spheres

Self-diffusion in sheared colloidal suspensions: violation of fluctuation-dissipation relation

Secondary convection due to second normal stress differences: A new mechanism for the mass transport of solutes in pressure-driven flows of concentrated, non-colloidal suspensions

Similar Documents

Tensorial rheological model for concentrated non-colloidal suspensions: normal-stress differences

Velocity oscillations in confined channel flows of concentrated colloidal suspensions

Transverse transport of solutes between co-flowing pressure-driven streams for microfluidic studies of diffusion/reaction processes

Mesoscale modeling of colloidal suspensions with adsorbing solutes

Comment on "Constant stress and pressure rheology of colloidal suspensions"

Mechanical aging and non-linear rheology of concentrated colloidal suspensions: experimental facts and simple models

ELECTRICALLY-DRIVEN NATURAL CONVECTION IN COLLOIDAL SUSPENSIONS

Scaling the normal stresses in concentrated non-colloidal suspensions of spheres

Self-diffusion in sheared colloidal suspensions: violation of fluctuation-dissipation relation

Secondary convection due to second normal stress differences: A new mechanism for the mass transport of solutes in pressure-driven flows of concentrated, non-colloidal suspensions