Device for measuring thermophysical properties of volume-variable fluid

Abstract

The invention provides a device for measuring thermophysical properties of a volume-variable fluid. The device comprises a volume-variable module, a visual balance kettle, a constant temperature module and a measuring module, wherein the constant temperature module comprises a constant temperature bath, a temperature measuring module, a pressure measuring module, a density measuring module and a component measuring module. A pressurized fluid in the volume-variable module is isolated from a target fluid in the visual balance kettle by an elastic element and is not in contact with the target fluid, so that the whole device is heated to a temperature close to the critical temperature of a to-be-measured fluid through the constant temperature bath for the to-be-measured fluid with known mass,the elastic element can be stretched by flushing the pressurized fluid without refilling a working medium, the volume of a cavity in which the to-be-measured fluid is located is changed, and the volume of the to-be-measured fluid is further changed; the temperature, pressure and components of the fluid at the moment are measured through the temperature, pressure and component measuring module, and the density at the moment is calculated; and the device can be used for rapidly measuring the critical temperature, pressure, density and components of the fluid, so that the unnecessary experimenttimes are saved, and the experiment period is shortened.

Description

technical field [0001] The invention relates to the field of fluid thermophysical property measurement, in particular to a variable volume fluid thermophysical property measurement device. Background technique [0002] The thermophysical data of fluids are indispensable basic parameters in many scientific research and engineering design fields such as energy, chemical industry, refrigeration, power, etc., and play an important role in improving the conversion efficiency of thermal energy and mechanical energy and reducing pollutant emissions. Therefore, obtaining fluid thermophysical property data that meets the requirements of users has always been a concern of relevant researchers. In particular, a large number of cutting-edge research in engineering thermophysics, such as clean vehicle fuels, new power, refrigeration and heat pump cycles, utilization of hydrogen and solar energy, enhanced heat transfer of functional fluids, waste treatment, etc., all involve many new work...

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Problems solved by technology

[0004] In addition, as far as the current experimental research on the critical thermal properties of the mixed working fluid is concerned, the current measurement method still relies on a large number of repeated measurements manually, and the average density of the working fluid must be changed every time to make it close to the critical density in order to observe the critical mass. phenomenon, and most experimental devices cannot measure multiple critical parameters of the fluid at the same time, coupled with the special nature of the critical point itself, it takes more than ten hours for each measurement, resulting in an extremely long time for the experimental data of the critical parameters , which is far from being able to meet the large demand for fluid critical thermophysical property data in industry and other fields

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