Effect of inhomogeneous heat flow on the enhancement of heat capacity in helium-II by counterflow near Tλ

S. T.P. Boyd, A. R. Chatto, R. A.M. Lee, R. V. Duncan, D. L. Goodstein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In 2000 Harter et al. reported the first measurements of the enhancement of the heat capacity ΔCQ≡C(Q)-C(Q=0) of helium-II transporting a heat flux density Q near Tλ. Surprisingly, their measured ΔCQ was ∼7-12 times larger than predicted, depending on which theory was assumed. In this report we present a candidate explanation for this discrepancy: unintended heat flux inhomogeneity. Because C(Q) should diverge at a critical heat flux density Qc, homogeneous heat flow is required for an accurate measurement. We present results from numerical analysis of the heat flow in the Harter et al. cell indicating that substantial inhomogeneity occurred. We determine the effect of the inhomogeneity on ΔCQ and find rough agreement with the observed disparity between prediction and measurement.

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages133-134
Number of pages2
DOIs
StatePublished - 2006
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: Aug 10 2006Oct 17 2006

Publication series

NameAIP Conference Proceedings
Volume850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period08/10/0610/17/06

Keywords

  • Heat capacity
  • Helium
  • Lambda transition
  • Superfluid

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    Boyd, S. T. P., Chatto, A. R., Lee, R. A. M., Duncan, R. V., & Goodstein, D. L. (2006). Effect of inhomogeneous heat flow on the enhancement of heat capacity in helium-II by counterflow near Tλ. In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 133-134). (AIP Conference Proceedings; Vol. 850). https://doi.org/10.1063/1.2354638