Journal of Low Temperature Physics

, Volume 65, Issue 3–4, pp 185–212 | Cite as

Thermal transport properties in helium near the superfluid transition. I.4He in the normal phase

  • M. Dingus
  • F. Zhong
  • H. Meyer
Article

Abstract

The thermal conductivity κ and the associated relaxation time τ to reach steady-state conditions are reported for the normal phase of several very dilute mixtures of3He in4He (X<4 × 10−6) at saturated vapor pressure near Tλ. The measurements were made over the reduced temperature range 2.5 × 10−6<ɛ<2×10−1, where ɛ ≡ (T−Tλ)/Tλ, and are representative for pure4He. The spacing between the cell plates was 0.147 cm. The systematic uncertainty in the conductivity data is estimated to increase from ∼2% for ɛ=0.2 to ∼4% for ɛ=3 × 10−6. The random scatter due to finite temperature resolution increases to ∼7% at the smallest ɛ. The data are in agreement within the combined uncertainty with recent ones by Tam and Ahlers (cell F, spacing 0.20 cm) and with previous ones in this laboratory taken with a different plate spacing. The thermal diffusivity coefficientD T = κ / ϱC p obtained from τ is found to agree within better than 15% with the calculated one using data for κ, the density ϱ, and the specific heatC p . Measurements of the effective boundary resistivityR b in the superfluid phase are described.R b is found to depend on the thermal history of the cell when cycled up to 77 K and above. Also,R b shows the beginning of an anomalous increase for ¦ɛ¦≲10−4. The possible reasons for this anomaly are discussed, and their impact on the analysis of conductivity data in the normal phase is appraised.

Keywords

Thermal Conductivity Vapor Pressure Thermal Diffusivity Systematic Uncertainty Saturated Vapor 

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Copyright information

© Plenum Publishing Corporation 1986

Authors and Affiliations

  • M. Dingus
    • 1
  • F. Zhong
    • 1
  • H. Meyer
    • 1
  1. 1.Department of PhysicsDuke UniversityDurham

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