dc.contributor.author | Avital, E | |
dc.contributor.author | Miloh, T | |
dc.date.accessioned | 2021-10-08T09:34:22Z | |
dc.date.available | 2021-09-20 | |
dc.date.available | 2021-10-08T09:34:22Z | |
dc.date.issued | 2021 | |
dc.identifier.issn | 1292-8941 | |
dc.identifier.uri | https://qmro.qmul.ac.uk/xmlui/handle/123456789/74420 | |
dc.description.abstract | An analytical framework is presented for calculating the self-induced thermophoretic velocity of a laser-heated Janus metamaterial micro-particle, consisting of two conducting hemispheres of different thermal and electric conductivities. The spherical Janus is embedded in a quiescent fluid of infinite expanse and is exposed to a continuous light irradiation by a defocused laser beam. The analysis is carried under the electrostatic (Rayleigh) approximation (radius small compared to wave-length). The linear scheme for evaluating the temperature field in the three phases is based on employing a Fourier-Legendre approach, which renders rather simple semi-analytic expressions in terms of the relevant physical parameters of the titled symmetry-breaking problem. In addition to an explicit solution for the self-thermophoretic mobility of the heated Janus, we also provide analytic expressions for the slip-induced Joule heating streamlines and vorticity field in the surrounding fluid, for a non-uniform (surface dependent) Soret coefficient. For a ‘symmetric’ (homogeneous) spherical particle, the surface temperature gradient vanishes and thus there is no self-induced thermophoretic velocity field. The ‘inner’ temperature field in this case reduces to the well-known solution for a laser-heated spherical conducting colloid. In the case of a constant Soret phoretic mobility, the analysis is compared against numerical simulations, based on a tailored collocation method for some selected values of the physical parameters. Also presented, are some typical temperature field contours and heat-flux vectors prevailing in the two-phase Janus as well as light-induced velocity and vorticity fields in the ambient solute, and a new practical estimate for the self-propelling velocity. | en_US |
dc.publisher | EDP Sciences | en_US |
dc.relation.ispartof | The European Physical Journal E: soft Matter and Biological Physics | |
dc.rights | This is a pre-copyedited, author-produced version of an article accepted for publication in The European Physical Journal E: soft Matter and Biological Physics following peer review. | |
dc.subject | Spherical Janus self-thermophoresis | en_US |
dc.subject | opto-thermoelectric microswimmers | en_US |
dc.subject | Light-induced thermoosmosis | en_US |
dc.subject | Janus-particle and symmetry-breaking | en_US |
dc.subject | Joule-heating and heat-conduction | en_US |
dc.title | Self-thermophoresis of Laser-heated spherical Janus particles | en_US |
dc.type | Article | en_US |
dc.rights.holder | © 2021, EDP Sciences | |
pubs.notes | Not known | en_US |
pubs.publication-status | Accepted | en_US |
dcterms.dateAccepted | 2021-09-20 | |
rioxxterms.funder | Default funder | en_US |
rioxxterms.identifier.project | Default project | en_US |