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Method for measuring gaseous diffusion coefficient with double-flow gaseous quasi-static process

A technology of gas diffusion and quasi-static method, which is applied in the field of measuring gas diffusion coefficient, and can solve problems such as deviation of measured value from the true value, vibration, and complex structure

Inactive Publication Date: 2013-10-23
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of the Loschmidt cell system is complex; the stefan tube can only measure the diffusion coefficient of the gas after the liquid is vaporized; the double volume method needs to set up agitators in two large containers, and the stirring effect keeps the gas concentration in the containers uniform. The introduction of the stirrer will cause the gas in the cavity to vibrate due to the working frequency of the stirrer and its difference. The heat accumulation of the stirrer for a long time will inevitably lead to the temperature difference in the two containers, which will make the measured value deviate from the true value.

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  • Method for measuring gaseous diffusion coefficient with double-flow gaseous quasi-static process
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  • Method for measuring gaseous diffusion coefficient with double-flow gaseous quasi-static process

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Effect test

Embodiment 1

[0076] Embodiment 1. A method for measuring the diffusion coefficient of non-radioactive gases using a double-flow gas quasi-static method, adopting a large-volume gas tank 10 in the closed-loop first air flow circuit A at one end of the diffusion tube 1, and the gas in the gas tank 10 The two ends of the first gas flow pipe 2 are connected through the first gas pump 9 , the first gas concentration measuring device 6 and the pipeline. Under the action of the first air pump 9, the gas circulates in the closed-loop first airflow circuit A. Since the volume of the gas tank 10 is large enough, the gas concentration in the closed-loop first airflow circuit A is considered to be constant during the diffusion process. See Be a diffusion source with a constant concentration. In the open-loop second gas flow circuit B at the other end of the diffusion pipe 1 , the concentration of the diffused gas is measured by the second gas pump 7 and the second gas concentration measuring device 8 ...

Embodiment 2

[0098] Embodiment 2. A method for measuring the diffusion coefficient of radioactive gases using a double-flow gas quasi-static method. A radioactive gas source 11 is used in the first gas flow circuit A at one end of the diffusion tube 1, and the radioactive gas in the radioactive gas source 11 passes through the first gas flow circuit A. The air pump 9 , the first gas concentration measuring device 6 and the pipeline are connected to both ends of the first gas flow pipe 2 . Under the action of the first gas pump 9, the radioactive gas circulates in the first gas flow circuit A. During the circulation process, since the radioactive gas source 11 releases gas at a constant rate, and at the same time decays into other substances, it can be recovered after a period of time. When equilibrium is reached, it can be considered that during the diffusion process, the concentration of radioactive gas in the first gas flow circuit A remains unchanged, and it can be regarded as a diffusio...

Embodiment 3

[0125] Embodiment 3. A method for measuring the diffusion coefficient of radioactive gas using a double-flow gas quasi-static method. A radioactive gas source 11 is used in the first air flow circuit A at one end of the diffusion tube 1, and the radioactive gas in the radioactive gas source 11 passes through the first gas flow circuit A. The air pump 9 , the first gas concentration measuring device 6 and the pipeline are connected to both ends of the first gas flow pipe 2 . Under the action of the first gas pump 9, the radioactive gas circulates in the first gas flow circuit A. During the circulation process, since the radioactive gas source 11 releases gas at a constant rate, and at the same time decays into other substances, it can be recovered after a period of time. When equilibrium is reached, it can be considered that during the diffusion process, the concentration of radioactive gas in the first gas flow circuit A remains unchanged, and it can be regarded as a diffusion ...

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Abstract

The invention discloses a method for measuring a gaseous diffusion coefficient with a double-flow gaseous quasi-static process. A pipeline of a diffusion pipe is applied to gas diffusion; the length of the diffusion pipe is L; air pressures at the two ends of the pipeline of the diffusion pipe are equal; a first gas flow loop A and a second gas flow loop B are formed respectively at the two ends of the diffusion pipe; a first gas flow pipe in the first gas flow loop A is arranged at one end of the diffusion pipe; a first gas pump, a gas tank or a radioactive gas source and a first gas concentration measuring device are connected in series to the two ends of the first gas flow pipe in sequence through pipelines, so that the first gas flow loop A is constructed, and content gas concentration in the loop is ensured; a second gas flow pipe in the second gas flow loop B is arranged at the other end of the diffusion pipe; gas mixing cavities are formed at gas inlet and outlet at the two ends of the second gas flow pipe; and a second gas pump and a second gas concentration measuring device are connected in series to the two ends of the second gas flow pipe in sequence through pipelines, so that the second gas flow loop is constructed for measuring gas concentration after diffusion.

Description

technical field [0001] The invention relates to a method for measuring the gas diffusion coefficient, in particular to a method for measuring the gas diffusion coefficient by a double-flow gas quasi-static method. Background technique [0002] At present, the methods for measuring the gas diffusion coefficient include: Loschmidt cell, stefan tube and double volume method. The structure of the Loschmidt cell system is complex; the stefan tube can only measure the diffusion coefficient of the gas after the liquid is vaporized; the double volume method needs to set up agitators in two large containers, and the stirring effect keeps the gas concentration in the containers uniform. The introduction of the stirrer will cause the gas in the chamber to vibrate due to the operating frequency of the stirrer and its difference. The heat accumulation of the stirrer for a long time will inevitably lead to the temperature difference between the two containers, which will make the measured...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 谭延亮刘辉袁红志
Owner HENGYANG NORMAL UNIV