Dispersion of overdamped diffusing particles in channel flows coupled to transverse acoustophoretic potentials: Transport regimes and scaling anomalies
(2015) In Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) 92(3).- Abstract
- We address the dispersion properties of overdamped Brownian particles migrating in a two-dimensional acoustophoretic microchannel, where a pressure-driven axial Stokes flow coexists with a transverse acoustophoretic potential. Depending on the number and symmetries of the stable nodal points of the acoustophoretic force with respect to the axial velocity profile, different convection-enhanced dispersion regimes can be observed. Among these regimes, an anomalous scaling, for which the axial dispersion increases exponentially with the particle Peclet number, is observed whenever two or more stable acoustophoretic nodes are associated with different axial velocities. A theoretical explanation of this regime is derived, based on exact moment... (More)
- We address the dispersion properties of overdamped Brownian particles migrating in a two-dimensional acoustophoretic microchannel, where a pressure-driven axial Stokes flow coexists with a transverse acoustophoretic potential. Depending on the number and symmetries of the stable nodal points of the acoustophoretic force with respect to the axial velocity profile, different convection-enhanced dispersion regimes can be observed. Among these regimes, an anomalous scaling, for which the axial dispersion increases exponentially with the particle Peclet number, is observed whenever two or more stable acoustophoretic nodes are associated with different axial velocities. A theoretical explanation of this regime is derived, based on exact moment homogenization. Attention is also focused on transient dispersion, which can exhibit superballistic behavior <(x - < x >)(2 >) similar to t(3), x being the axial coordinate. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8077541
- author
- Giona, Massimiliano and Garofalo, Fabio LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
- volume
- 92
- issue
- 3
- article number
- 032104
- publisher
- American Physical Society
- external identifiers
-
- wos:000360602800002
- pmid:26465423
- scopus:84942309817
- pmid:26465423
- ISSN
- 1539-3755
- DOI
- 10.1103/PhysRevE.92.032104
- language
- English
- LU publication?
- yes
- id
- 50fb28b9-fa87-45ec-a6b8-5b6588fb4852 (old id 8077541)
- date added to LUP
- 2016-04-01 10:34:23
- date last changed
- 2022-01-26 00:28:20
@article{50fb28b9-fa87-45ec-a6b8-5b6588fb4852, abstract = {{We address the dispersion properties of overdamped Brownian particles migrating in a two-dimensional acoustophoretic microchannel, where a pressure-driven axial Stokes flow coexists with a transverse acoustophoretic potential. Depending on the number and symmetries of the stable nodal points of the acoustophoretic force with respect to the axial velocity profile, different convection-enhanced dispersion regimes can be observed. Among these regimes, an anomalous scaling, for which the axial dispersion increases exponentially with the particle Peclet number, is observed whenever two or more stable acoustophoretic nodes are associated with different axial velocities. A theoretical explanation of this regime is derived, based on exact moment homogenization. Attention is also focused on transient dispersion, which can exhibit superballistic behavior <(x - < x >)(2 >) similar to t(3), x being the axial coordinate.}}, author = {{Giona, Massimiliano and Garofalo, Fabio}}, issn = {{1539-3755}}, language = {{eng}}, number = {{3}}, publisher = {{American Physical Society}}, series = {{Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}}, title = {{Dispersion of overdamped diffusing particles in channel flows coupled to transverse acoustophoretic potentials: Transport regimes and scaling anomalies}}, url = {{http://dx.doi.org/10.1103/PhysRevE.92.032104}}, doi = {{10.1103/PhysRevE.92.032104}}, volume = {{92}}, year = {{2015}}, }