Thermal conductivity of nitrogen from 50-degrees to 500-degrees-C and 1 to 100 atmospheres

Abstract

A new apparatus has been constructed for meas urements of the the rm al conductiv ity of gases up to 500°C and 100-atmosphere p ress ure. The paral lel-plate m ethod was used with a spacing of about 0.5 millimeter betwee n the hotplate and coldplate. A capacitance method was used to measure the effect ive s pacing and area of t he plates und er the conditions of the expe rim e nt. No solid material was used bet,,'ec n the plates. The e ffect of radiation was minimized by use of polished s ilver parts a nd I\"aS accounted for by experiments with the conductivity cell evac uatcd. ~1eas ure m e llt s o n nit roge n were made at J, 50, and 100 atmosphe res, and from 50° to 500°C. It is beli e l'ed that. the accuracy of the r es ul ts is about 0.5 percent, except at the highest gas de nsities.