Measuring method of thermal conductivity

Abstract

Abstract PURPOSE:To enable effective measurement of the thermal conductivity of a liquid of low viscosity and low thermal conduction by a method wherein a slender wire which is a part of electrification of a probe for measurement is so set as to be parallel to the direction of gravity in a substance to be measured. CONSTITUTION:When the thermal conductivity of a liquid is measured on the basis of a buoyancy convection, first a slender wire is stretched in parallel to the direction of gravity. Then a prescribed power is supplied to the slender wire, and simultaneously with or immediate ly before the start of measurement, a sample is made to drop freely in the state wherein the slender wire is left inserted. A current is made to flow through the slender wire in the course of free dropping, and the thermal conductivity is measured by measuring an electric resistance at that time. Or the slender wire is stretched in parallel to the direction of gravity and a current of a prescribed power is made to flow through the slender wire, first, in this state. Although the buoyancy convection occurs due to heating of the slender wire in this state, a time from the start of flow of the current to the occurrence of the buoyancy convec tion is measured. Then it is started to make the current flow through the slender wire once again in the state wherein the slender wire is stretched in parallel to gravity, the free drop is started before the occurrence of the buoyancy convection measured previously, and thereby the thermal conductivity can be measured.

Inventors

• 👤 Arata Nakamura
• 👤 新 中村

Bibliographic Details