METHOD FOR INVESTIGATION OF THERMOPHYSICAL PROPERTIES OF LIQUIDS AND DEVICE FOR ITS IMPLEMENTATION

摘要

FIELD: measurement equipment.;SUBSTANCE: method for examination of thermophysical properties of liquids is proposed. It implies that a metal probe of vibration viscosity metre equipped by a temperature sensor is placed to a metal cell with a liquid sample equipped by a temperature sensor. The probe is set to harmonic vibration mode, the cell temperature is changed by a controlled cooling-heating device. Temperature, amplitude, phase and vibration frequency of the probe are measured and density, viscosity and thermal diffusivity of the liquid is determined depending on its temperature. Measurements are made to define dependency on the temperature of the liquid's optical transmission near the probe for the moments when the probe passes its equilibrium position. Device for the method implementation comprises a cell, a controlled cooling-heating device, spherical metal probe of vibration viscosity metre placed inside the cell. The probe and the cell are equipped by temperature sensors. The cell is also equipped with a fibre-optical sensor of liquid optical transmission which is set next to the probe.;EFFECT: improved accuracy of measurement.;2 cl, 2 dwg