A water vapor condensation characteristic measurement device based on laser absorption and scattering

Abstract

The invention discloses a laser-absorption / scattering-based water vapor condensation characteristic measuring device which comprises a condensation cavity for gas mixing and heat exchange, and an optical measurement module arranged in the condensation cavity, wherein the condensation cavity is arranged in a vacuum case; both ends of the condensation cavity are respectively provided with a gas inlet and a gas outlet; the gas inlet is provided with an air inlet and a nitrogen inlet in parallel; the optical measurement module comprises a U-shaped bracket, and a minitype laser generator and a minitype spectrographic detector which are arranged on both arms of the U-shaped bracket; a second reflecting mirror and a fourth reflecting mirror are arranged below the minitype laser generator; and a first reflecting mirror and a third reflecting mirror are arranged above the minitype spectrographic detector, and a minitype temperature sensor is arranged below the minitype spectrographic detector. Water vapor in the air is condensed to form water fog in the condensation tube. The minitype laser generator can generate the laser with specific intensity and wavelength; and the minitype spectrographic detector can measure the intensity of the absorbed and scattered laser, and can accurately measure the volume percent of the water fog in the air according to the light intensity-water fog concentration corresponding relation.

Description

technical field [0001] The invention relates to a fluid phase change experiment device, in particular to a water vapor condensation characteristic measurement device based on laser absorption and scattering. Background technique [0002] Water mist has been widely used in extinguishing various types of fires in electrical appliances, ships, and buildings. It has also been used and developed in the fields of oil and natural gas pipeline transportation and mine gas explosion prevention and suppression. Water mist concentration is one of the important parameters to characterize the characteristics of water mist in space. The research on the condensation characteristics of water vapor and other gases is generally limited to the contact heat transfer research with solids, such as the condensation characteristics of gas on the inner surface of a circular tube or the surface of a fin. The liquid formed by heat exchange and condensation inside the gas is often misty and mixed with ...

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Problems solved by technology

[0012] Aiming at the deficiencies of the existing technology, the present invention provides a water vapor condensation characteristic measurement device based on laser absorption and scattering, which solves the following problems in the research of the internal heat transfer and condensation characteristics of the gas: It is difficult to quickly and accurately measure local water mist concentration; the measurement of water mist concentration at different locations; the variable working condition control problem of heat transfer characteristics research

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