Device and method for measuring diffusion coefficients of variable-volume constant-pressure gas in liquid

A diffusion coefficient and measurement device technology, applied in the direction of measurement devices, diffusion analysis, instruments, etc., can solve the problem of not being able to measure the gas diffusion coefficient under constant pressure, and achieve the effects of low cost, convenient operation, and simple experimental measurement

Active Publication Date: 2017-05-31
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a device and method for measuring the diffusion coefficient of gas in liquid under variable volume and constant pressure, so as to solve the defect that the pressure decay method cannot measure the diffusion coefficient of gas in liquid under constant pressure

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  • Device and method for measuring diffusion coefficients of variable-volume constant-pressure gas in liquid
  • Device and method for measuring diffusion coefficients of variable-volume constant-pressure gas in liquid
  • Device and method for measuring diffusion coefficients of variable-volume constant-pressure gas in liquid

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the drawings and embodiments, and the embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0036] Such as figure 1 As shown, a device for measuring the diffusion coefficient of gas in liquid under variable volume and constant pressure, the device includes: gas sample bottle 1, vacuum pump 2, first valve 3, second valve 4, third valve 5, gas chamber 6 , the first pressure sensor 7, the fourth valve 8 (injection valve), displacement sensor 9, diffusion chamber 10, constant temperature tank 11, platinum resistance thermometer 12, data acquisition system 13, the second pressure sensor 14, the fifth valve 15 ( Exhaust valve), pressure reducing valve 16 and pressure control cylinder 17. The gas chamber 6 is connected to the gas sample bottle 1 and the vacuum pump 2 through a pipeline with a valve (the specific c...

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Abstract

The invention discloses a device and method for measuring diffusion coefficients of variable-volume constant-pressure gas in liquid. The device mainly comprises a gas sample bottle, a gas cavity, a diffusion cavity, a thermostatic bath, a valve, a vacuum pump, a reducing valve, a displacement sensor, a pressure sensor, a platinum resistance thermometer and a data acquisition system, wherein the diffusion cavity adopts a visible window structure with quartz glass; the diffusion cavity is equipped with the pressure sensor and the displacement sensor; the pressure of the diffusion cavity is kept constantly by a movable piston and a pressure-controlled gas cylinder in the diffusion process; the movement distance of the movable piston in the measurement process is measured by the displacement sensor; diffusion data of the gas in the liquid are calculated and obtained through the Fick's second law. The device realizes measurement of diffusion data of the gas in the liquid at the constant pressure, and has the advantages of simple structure, low cost, convenience in operation and stable system.

Description

technical field [0001] The invention belongs to the fields of chemical engineering and fluid thermophysical property measurement, in particular to a device and method for measuring the diffusion coefficient of gas in liquid under variable volume and constant pressure. Background technique [0002] As one of the three major migration properties of fluids, diffusion coefficient is the basic parameter for studying the movement and transfer phenomena of fluid molecules, for example, it is the limiting factor for the mixing and separation process of solutions and chemical reactions. At present, there are many reports on the measurement methods of gas diffusion coefficient in liquid, mainly including: pressure decay method, gravity balance method, time delay method, dynamic light scattering method, real-time concentration measurement method, etc. Among them, the pressure decay method is the most widely used. It mainly obtains the diffusion coefficient by measuring the relationship...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 何茂刚刘向阳彭三国张颖
Owner XI AN JIAOTONG UNIV
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