1987 Volume 30 Issue 270 Pages 1935-1942
In this paper, weak natural convection effects in the transient hot wire method of liquid thermal conductivity measurement are analytically investigated. Precise numerical calculations are performed using the FDM, concerning the slow natural convection liquid flow around a single thin hot wire and the distribution of the modified temperature term due to the flow. Then, the time dependencies of the apparent thermal conductivity, including the natural convection effects, are shown for various measuring conditions. The error in measurement are also shown for the case where two hot wires, having different lengths, are set in the Wheatstone bridge circuit to decrease the edge effects. It is shown, as a result, that slight natural convection effects appear, even during short periods of measurement, where the effects on accuracy had been considered negligible.
JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing
JSME International Journal Series B Fluids and Thermal Engineering
JSME International Journal Series A Solid Mechanics and Material Engineering
JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry
JSME international journal. Ser. A, Mechanics and material engineering
JSME international journal. Ser. 1, Solid mechanics, strength of materials