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• W3195514013 endingPage "121847" @default.
• W3195514013 startingPage "121847" @default.
• W3195514013 abstract "• The transient heat propagation in homogeneous thermal system with a hotspot or time varying heat source is studied based on the frequency independent phonon BTE under the Callaway model. • An interesting phenomenon is predicted, namely, beyond quasi one dimensional thermal system, the transient temperature will be lower than the lowest value of initial environment temperature in the hydrodynamic regime within a certain range of time and space. • This peculiar heat propagation phenomenon of hydrodynamic phonon transport distinguishes it well from the heat propagation in the ballistic regime. Previous studies have predicted the failure of Fourier’s law of thermal conduction due to the existence of wave like propagation of heat with finite propagation speed. This non-Fourier thermal transport phenomenon can appear in both the hydrodynamic and (quasi) ballistic regimes. Hence, it is not easy to clearly distinguish these two non-Fourier regimes only by this phenomenon. In this work, the transient heat propagation in homogeneous thermal system is studied based on the phonon Boltzmann transport equation (BTE) under the Callaway model. Given a quasi-one or quasi-two (three) dimensional simulation with homogeneous environment temperature, at initial moment, a heat source is added suddenly at the center with high temperature, then the heat propagates from the center to the outer. Numerical results show that in quasi-two (three) dimensional simulations, the transient temperature will be lower than the lowest value of initial temperature in the hydrodynamic regime within a certain range of time and space. This phenomenon appears only when the normal scattering dominates heat conduction. Besides, it disappears in quasi-one dimensional simulations. Similar phenomenon is also observed in thermal systems with time varying heat source. This transient heat propagation phenomenon of hydrodynamic phonon transport distinguishes it well from (quasi) ballistic phonon transport." @default.
• W3195514013 created "2021-08-30" @default.
• W3195514013 creator A5017468827 @default.
• W3195514013 creator A5056004583 @default.
• W3195514013 date "2021-12-01" @default.
• W3195514013 modified "2023-10-01" @default.
• W3195514013 title "A transient heat conduction phenomenon to distinguish the hydrodynamic and (quasi) ballistic phonon transport" @default.
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• W3195514013 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2021.121847" @default.
• W3195514013 hasPublicationYear "2021" @default.
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