Operating characteristics of twophase nitrogen thermosyphons
Abstract
Heat transfer characteristics of a twophase nitrogen thermosyphon are experimentally investigated. The thermosyphon made of stainless steel has a length of 0.368 m and an inner diameter of 0.009 m. The thermal resistance of the thermosyphon is obtained as a function of heat transfer rate at various filling ratios in the vapor pressure range from 0.5 x 10 exp 5 to 2.0 x 10 exp 5 Pa. The effective thermal conductivity determined from the experimental results is found to be about 24 times as large as that of copper. The maximum heat transfer rate, which is 94 W, is almost the same as that of the freon thermosyphon in the moderate temperature range.
 Publication:

Advances in Cryogenic Engineering. Vol. 35B  Proceedings of the 1989 Cryogenic Engineering Conference
 Pub Date:
 1990
 Bibcode:
 1990acge...35..453I
 Keywords:

 Cryogenic Temperature;
 Heat Transfer;
 Liquid Nitrogen;
 Thermal Conductivity;
 Thermosiphons;
 Heat Pipes;
 High Temperature Superconductors;
 Thermal Resistance;
 Fluid Mechanics and Heat Transfer