The method and the device for measuring thermophysical properties of liquids

Abstract

Abstract This paper describes the new method and the device for measuring the effective thermophysical characteristics of the investigated fluid under shear flow conditions at a fixed shear rate in the gap between coaxial cylinders. The shear flow is provided by the rotation of the outer cylinder while the inner cylinder remains stationary. The measuring unit can measure the complex rheological and thermophysical characteristics of liquids in less than 30 minutes. This article describes a two-step measurement method. The first step involves the measurement of the excess temperature established because of the heat source action due to the viscous friction in shear flow of the test liquid in a layer between the cylinders; the function of the dissipative heat source in the fluid at this stage is based on the power-law. The second step includes the thermal effect on the liquid layer from the heat source (electric heater) in the inner cylinder and the registration of the temperature response in the inner cylinder layer near the heater. The experimental determination results of polyoxyethylene solution thermophysical characteristics with the addition of nanocarbon material “Taunit” are presented here.