THE DEVELOPMENT AND STUDY OF A THERMORESISTANT METER OF THE LEVEL OF CRYOGENIC LIQUID BASED ON HIGH-TEMPERATURE SUPERCONDUCTORS

Abstract

In many industrial sectors are used increasingly the various technology with application of liquid cryogenic products. In this connection the topical issue is a diagnosis of the state, control and measurement of the parameters of liquid and vapor-liquid cryogenic media. A special place among them is the development of advanced devices for the control of liquid level in cryogenic tanks. The progress in the production of high-temperature superconductors (HTSC) created the preconditions for the development of simple and convenient a new type of sensors to measure based on them the level of cryogenic liquids. The physical and mathematical model of HTSC sensor was made based on the differential equation of unsteady thermal conductivity in the body of the elongated conductor taking into account the internal ohmic resistance and heat exchange on its surface separately from the liquid and vapor phases of a cryogenic agent. The results of modeling of heat exchange of HTSC conductor with liquid nitrogen are considered. Experimentally obtained its operating characteristics have been presented. On their basis was designed and developed a secondary level meter of liquid nitrogen. Its approbation in the Dewar flask filled with liquid nitrogen was carried out.