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Effect of Inhomogeneous Heat Flow on the Enhancement of Heat Capacity in Helium-II by Counterflow near Tλ

Boyd, S. T. P. and Chatto, A. R. and Lee, R. A. M. and Duncan, R. V. and Goodstein, D. L. (2006) Effect of Inhomogeneous Heat Flow on the Enhancement of Heat Capacity in Helium-II by Counterflow near Tλ. In: International Conference on Low Temperature Physics, 24th, Orlando, FL, 10-17 August 2005. AIP Conference Proceedings. No.850. American Institute of Physics , Melville, NY, pp. 133-134. ISBN 0-7354-0347-3. https://resolver.caltech.edu/CaltechAUTHORS:BOYaipcp06

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Abstract

In 2000 Harter et al. reported the first measurements of the enhancement of the heat capacity ΔCQ[equivalent]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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1063/1.2354638DOIUNSPECIFIED
ORCID:
AuthorORCID
Lee, R. A. M.0000-0001-6509-697X
Additional Information:© 2006 American Institute of Physics. Issue Date: September 7, 2006. Work supported by NASA Fundamental Physics Discipline NAG3-1763 (STPB), NAG3-2900 (ARC, RAML, DLG), and JPL #960494 (RVD). RVD acknowledges support at Caltech as a Moore Distinguished Scholar.
Funders:
Funding AgencyGrant Number
NASANAG3-1763
NASANAG3-2900
NASA/JPL960494
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:superfluid helium-4, specific heat, heat transfer
Series Name:AIP Conference Proceedings
Issue or Number:850
Record Number:CaltechAUTHORS:BOYaipcp06
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:BOYaipcp06
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9925
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Mar 2008
Last Modified:03 Oct 2019 00:04

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