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Proceedings of the 1998 NASA/JPL Microgravity Fundamental Physics Workshop, Oxnard, CA, June 23-25, 1998
 

Summary: Proceedings of the 1998 NASA/JPL Microgravity Fundamental Physics
Workshop, Oxnard, CA, June 23-25, 1998
Finite-Size and Gravity Effects on the Thermal
Conductivity of 4
He near T
Guenter Ahlers
Department of Physics and Center for Nonlinear Science,
University of California, Santa Barbara, California 93106
Abstract
This paper reviews the opportunities for microgravity and ground-based measure-
ments of the thermal conductivity (t, L) near the bulk superfluid-transition line
T(P) of 4He confined in cylindrical geometries with axial heat flow. It provides an
evaluation of existing data near T at saturated vapor pressure (SVP) in cylinders
of L = 1Ám radius, and uses these to derive a scaling function for the resistivity
R(t, L) = 1/(t, L). The purpose of future measurements over a wide range of L
and of the pressure P will be to test the applicability of this function. In the present
paper the scaling function is used to predict the conductivity for other values of L
and P. These predictions are used to assess quantitatively the effect of gravity on
potential Earth-based measurements. It is found that the gravity effect for R is par-
ticularly severe below T. The estimate of the gravity effect provides the foundation

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara

 

Collections: Physics