Burton, D. and Dow, R. C. M. and Lambert, Colin (1986) New approach to enhanced heat exchange efficiencies at ultralow temperatures. Physical Review B, 33 (11). pp. 7803-7805. ISSN 0163-1829Full text not available from this repository.
We examine the heat transfer between a sintered metallic powder and liquid 3He at ultralow temperatures. With the combination of a renormalization-group approach with the Lanczos method, a microscopic model is analyzed to yield the low-frequency density of states ρ(ω) of the sinter. In the weak-coupling limit ρ(ω) possesses a pronounced low-frequency peak leading to an enhanced heat transfer coefficient at low temperatures. This enhancement is shown to occur when the ratio of the long-wavelength velocity of sound Cs in the sinter to its velocity Cb in the bulk metal is small and can be optimized by minimizing this ratio.
|Journal or Publication Title:||Physical Review B|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited On:||24 Oct 2012 09:10|
|Last Modified:||07 Jan 2015 17:52|
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