Method for detecting evaporation process of droplet particles and measuring evaporation rate of droplet particles

A technology of evaporation rate and measurement method, which is applied in measurement devices, particle size analysis, particle and sedimentation analysis, etc. It can solve the problems affecting the measurement accuracy of droplet evaporation rate and inaccurate particle diameter, and achieve strong practicability and high measurement accuracy. , the effect of high measurement accuracy

Inactive Publication Date: 2018-10-12
TIANJIN UNIV
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Problems solved by technology

For the case where the refractive index changes with the particle size, such as spray combustion field, if the refractive index is regarded as a constant, the calculated particle diameter is inaccurate, which affects the measurement accuracy of the droplet evaporation rate

Method used

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  • Method for detecting evaporation process of droplet particles and measuring evaporation rate of droplet particles
  • Method for detecting evaporation process of droplet particles and measuring evaporation rate of droplet particles

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Embodiment Construction

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0022] A kind of detection method of droplet particle evaporation process and its evaporation rate, see figure 1 and figure 2 , the measurement method includes the following steps:

[0023] 1. Build the optical system

[0024] according to figure 2 Build an optical path system, including: laser 1, beam expander collimation system 2, beam compression system 3, beam splitter 4, first mirror 5, second mirror 6 and third mirror 7, particles 8, imaging lens 9 , CCD 10.

[0025] Laser 1 is a vertically polarized semiconductor laser with a wavelength of λ=532nm and a maximum power of 1.5W. The thin beam emitted by the laser 1 is expanded, filtered, and collimated by the beam expander and collimator system 2 to form a circular beam with a diameter of 20mm;

[0026] Then the beam...

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Abstract

The invention discloses a method for detecting an evaporation process of droplet particles and measuring the evaporation rate of the droplet particles. The spherical droplet particles are illuminatedby two equal-intensity lamellar light beams oppositely, a focused two-point image or interference fringe pattern formed by scattered light of the particles is recorded in a 90-DEG scattering angle region, and the particle diameter d is obtained; a change relationship curve (d-t) of the particle size with the time is obtained according to the time-sequence focused two-point image or interference fringe pattern, and the droplet evaporation process is detected; the droplet evaporation rate is obtained by fitting the d2-t curve; the particle sizes at different times are squared and then subtracted, and the average evaporation rate of the droplets is calculated by the square difference of the particle sizes and the time intervals; the surface area and volume of the droplets at the time t are calculated, and the evaporation rate per unit surface area is calculated according to the surface area and volume changes of the droplets. The non-contact measurement has the advantages of simple principle, high measurement accuracy, high practicability and the like, and can be used for evaporation process and evaporation rate measurement of the droplet particles in spray atomization, spray combustion fields and chemical processes.

Description

technical field [0001] The invention relates to the field of droplet evaporation process and its evaporation rate measurement field, in particular to a detection method of droplet particle evaporation process and its evaporation rate measurement method. Background technique [0002] Droplet evaporation is a basic physical phenomenon in the process of spraying, chemical industry, etc. Accurately grasping the process of droplet evaporation and its laws is of great significance for improving production efficiency, energy saving, environmental protection and process stability. The detection of the droplet evaporation process is usually realized according to the size change of the droplet particle. Various measurement techniques and methods based on different measurement principles and suitable for different measurement objects have been proposed. Based on optical measurement methods mainly include: [0003] Imaging method, this method is to record the images of droplet particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/0211G01N15/0227
Inventor 吕且妮尉小雪李子璇
Owner TIANJIN UNIV
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