Kapitza resistance and thermal conductivity of Kapton in superfluid helium

✍ Scribed by B. Baudouy

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 354 KB
• Volume: 43
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(03)00178-4

✦ Synopsis

We have determined simultaneously the Kapitza resistance, R K , and the thermal conductivity, j, of Kapton HN sheets at superfluid helium temperature in the range of 1.4-2.0 K. Five sheets of Kapton with varying thickness from 14 to 130 lm, have been tested. Steady-state measurement of the temperature difference across each sheet as a function of heat flux is achieved. For small temperature difference (10-30 mK) and heat flux density smaller than 30 W m À2 , the total thermal resistance of the sheet is determined as a function of sheet thickness and bath temperature. Our method determines with good accuracy the Kapitza resistance, R K ¼ ð10540 AE 444ÞT À3  10 À6 K m 2 W À1 , and the thermal conductivity, j ¼ ½ð2:28 AE 0:54Þ þ ð2:40 AE 0:32Þ Â T  10 À3 W m À1 K À1 . Result obtained for the thermal conductivity is in good agreement with data found in literature and the Kapitza resistanceÕs evolution with temperature follows the theoretical cubic law.