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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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.

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Journal Article
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Physical review B
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24 Oct 2012 08:10
Last Modified:
18 Sep 2023 00:35