Thermal boundary resistance in superfluid {sup 4}He near T{sub {lambda}}

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00754633· OSTI ID:482492

Murphy, D; Meyer, H ^[1]

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1. Duke Univ., Durham, NC (United States)

New measurements of the boundary resistivity in superfluid {sup 4}He (2ppb {sup 3}He) near T{sub {lambda}} are reported as a function of {vert_bar}{var_epsilon}{vert_bar} ({var_epsilon} = T/T{sub {lambda}}(Q)-1) and of heat flux Q in a cell with parallel polished copper surfaces. Here the authors call T{sub {lambda}}(Q) the temperature where the superfluid state abruptly disappears. In this design, the sidewall gaps between the copper pieces and the stainless steel spacer were eliminated. In contrast to several previous experiments but in agreement with those of Li and Lipa, no large Q-dependent boundary resistivity anomaly was detected. However, as {vert_bar}{var_epsilon}{vert_bar} {yields} 0 the small weakly divergent resistivity was observed and its dependence on Q over the experimental range 1 < Q < 80 {mu}W/cm{sup 2} was found to be very small. These new results are compared with previous experiments and predictions. An explanation of the previously observed anomalous transport phenomena is presented in terms of a heat flow through the sidewall gaps in these cells, and its limitation by a critical flow value {Phi}{sub c}. This phenomenological model can be fit satisfactorily to the observations. In the appendix we calculate {Phi}{sub c} from mutual friction.

• Sponsoring Organization: USDOE
• OSTI ID: 482492
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 105; ISSN 0022-2291; ISSN JLTPAC
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 4
LAMBDA POINT
SUPERFLUIDITY
THERMAL BOUNDARY RESISTANCE
THERMAL CONDUCTIVITY