Kapitza resistance and thermal conductivity of Mylar at superfluid helium temperature

摘要

The Kapitza resistance and the thermal conductivity of type A Mylar sheets in the temperature range between 1.4 and 2.1 K have been determined. Four sheets with varying thickness from 37 um to 255 urn, have been tested in steady-state condition. For a small temperature difference (10-30mK) and heat flux density smaller than 30 Wm~(-2), the total thermal resistance of the sheet is determined as a function of sheet thickness and bath temperature. The Kapitza resistance is given by R_K = (1.28 + - 0.08) T~3 x 10~(-3) Km~2 W~(-1), and the thermal conductivity, K = [(8.83 + - 0.75) + (11.73 + - 0.43) x 7] x 10~(-3) Wm~(-1) K~(-1).