A rapid measurement method of liquid mist characteristics based on digital image processing technology

Abstract

The invention provides a rapid liquid mist characteristic measuring method based on a digital image treatment technique. The measuring method comprises the following steps: acquiring an image of a liquid mist field through a CCD (Charge Coupled Device) camera, performing gray processing, subsequently extracting liquid drop information in the image by a Roberts edge detection algorithm, calculating the SMD (Sauter Mean Diameter) of different areas of the liquid mist field, accounting the number of liquid drops in the different areas and the number of liquid drops with different diameters so as to obtain the distribution of the number of the liquid drops in the different areas, the distribution of the liquid drops with different diameters, the density distribution of the liquid drops, the volume distribution of the liquid drops, the accumulation volume distribution of the liquid drops, the average MMD (Mass Median Diameter) and the evenness indexes of the liquid drops, and inputting the data into Tecplot software to output a change curve and cloud distribution of the liquid mist characteristic parameters. The measuring method is high in measurement precision, high in speed and high in efficiency and is capable of performing batch processing on multiple liquid mist images and capable of further improving the measurement precision by increasing the sampling frequency, the liquid mist characteristic parameters are detailed, stable and reliable, and the measurement cost is effectively lowered.

Description

technical field [0001] The invention relates to the field of non-contact liquid mist characteristic measurement, in particular to a liquid mist characteristic rapid measurement method based on digital image processing technology. Background technique [0002] In the spray system and other industrial production processes, the atomization of liquid jet plays an important role in increasing the effective contact area between gas and liquid and strengthening the heat transfer and mass transfer between gas and liquid. The parameters for evaluating atomization quality are mainly the size distribution and spatial distribution of droplets. Among the literature (papers, reports and patents) published so far, LDV, PDPA, PDA and Malvern particle size analyzer, etc., can be developed by modern optical methods. The test technology measures the oil mist field, but its measurement cost is high, it is not easy to operate, and the measurement range is narrow, so it cannot measure the entire ...

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Problems solved by technology

The parameters for evaluating atomization quality are mainly the size distribution and spatial distribution of droplets. Among the literature (papers, reports and patents) published so far, LDV, PDPA, PDA and Malvern particle size analyzer, etc., can be developed by modern optical methods. The test technology measures the oil mist field, but its measurement cost is high, it is not easy to operate, and the measurement range is narrow, so it cannot measure the entire field, and different measurement technologies have different measurements of the characteristic parameters of the liquid mist field. The parameters are not comprehensive enough

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