Sistema automatizado para la medición de la conductividad térmica de líquidos mediante el método del alambre caliente

Abstract

We present the implementation of an automated system based on the hot-wire technique for measurement of the thermal conductivity of liquids using high precision equipment (current source and voltage meter) that allow to work without an array of resistances known as a Wheatstone bridge, commonly used in such equipments. We also use a criterion to verify that we are working on the correct linear region of the curve $\Delta T$ versus ln$ (t)$, which is used for experimental data processing. Finally we validate the functionality of the hot-wire experimental array by measuring the thermal conductivity in samples of liquids with well-known thermal properties.