Jeudi 5 Octobre 2017 à 14h00.

Transport Thermique aux Interfaces : Angle Critique des Phonons, Transfert à Travers un Gap ; Transfert Autour d’une Nanoparticule Colloïdale Cœur-Coquille

Ali Alkurdi

Invité(e) par
Axe : Théorie et modélisation
présentera en 1 heure :

''This thesis is devoted to the study of interfacial thermal transport at the nanoscale where Fourier’s law is not valid. This is because, at this scale, phonon mean free path becomes smaller to the characteristic length of the system, thus the heat transfer is no longer diffusive but rather ballistic. As a consequence, the thermal boundary resistance (TBR) becomes a determinant factor in heat transfer due to the fact that phonons which are the essential energy carriers in insulators are experiencing a lot of collisions with the boundaries compared to phonon-phonon collisions. The goal of this thesis is, firstly, to study phonon transmission and predict the thermal boundary conductance ( which is the inverse of the thermal boundary resistance) at interface between two solids; secondly, to quantify the phononic contribution in heat transfer across a nanometric vacuum gap that sep- arates two solids; and finally, to investigate heat transfer in a system made of a core-shell nanoparticle (NP) immersed in water and heated by a laser pulse.''

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