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New approach to enhanced heat exchange efficiencies at ultralow temperatures

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 0163-1829

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Abstract

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.

Item Type: Article
Journal or Publication Title: Physical Review B
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 58106
Deposited By: ep_importer_pure
Deposited On: 24 Oct 2012 09:10
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:07
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58106

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