Using a tuning fork sensor to measure viscosity in a closed volume

The original design of a laboratory viscosity sensor of the tuning fork type is considered, consisting of a tuning fork bracket, to the base of which, through a liquid-impermeable membrane, measuring probes (test bodies) are attached, which are immersed in the test liquid during the measurement process. The membrane divides the internal space of the composite housing shell into two volumes, one of which is measuring; Electromechanical transducers are attached to the branches of the tuning fork bracket, which provide excitation of oscillations of the measuring system and registration of the output signal changing during the experiment. The design of the viscosity sensor provides for its installation on the horizontal movable platform of the universal stand-stand of the vibration viscometer “Reokinetics” with fixation on the sliders, and also provides the possibility of connecting an external circulation thermostat. The proposed design of a viscosity sensor can be used in the development of measuring systems designed to monitor the rheological state of metastable liquids in a closed measuring volume, including evaporating and toxic liquids, as well as gel-forming compositions used in enhanced oil recovery technologies to limit water inflow and redistribute filtration flows, which are initially low-viscosity Newtonian fluids, which after injection into the formation form a gel after a given time. The results of measurements of the viscosity of standard hydrocarbon liquids in a closed measuring volume are presented; It has been established that the dependence of the output signal of the proposed sensor included in the control circuit of the vibration viscometer “Reokinetics” on the square root of the product of the viscosity and density of the liquid under study is linear; The sensitivity of the sensor was determined, the value of which is 0.1 V·(kg·Pa·s·m-3)-0.5.