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Aug 3, 2023 at 16:26 comment added user3106891 Thank you so much for your explanation and the book suggestion, mike! This is super helpful :)
Aug 3, 2023 at 15:34 comment added mike stone Exactly. In the absence of backscattering you have ballistic transport. There is a nice book "Imaging Phonons: Acoustic Wave Propagation in Solids" by Jim Wolfe with pictures of what happens to low-energy phonons which are almost ballistic.
Aug 3, 2023 at 15:23 vote accept user3106891
Aug 3, 2023 at 14:57 comment added user3106891 I see, so the scattering causes the phonons to bounce back limiting the "flow" of thermal transfer?
Aug 3, 2023 at 14:38 history answered mike stone CC BY-SA 4.0