Study Of Gray Feature Of Water Bubbles Group Image

Bubble in water widely exists in many areas,plays an important role in heat and mass transfer,obviously the investigation of bubble in water helps to improve and increase productivity of these areas.The study of water bubbles also is a hot research topic in the two-phase discipline.However,most studies have focused on the bubble geometry parameters,motion parameters,separate parameters,void fraction.This paper studies gas volume and distribution of bubbles via the gray feature of bubbles cluster in water.In this paper,gray of bubbles cluster in water is regarded as the research topic;buliding a bubbles cluster image gray value real-time acquisition system.With the image measurement technology,gray of bubbles cluster in water are measured.The air volume flow rate range is 20.9-27.93 L / min,28.68-36 L / min and 34.08-48.88 L/min.By the entire picture,gray value of image is studied.The image gray value-time curve and air volume rate – time curve has a better similarity.The results reveal that the gray value of the water bubble clusters could reflect the volume flow.To study the spatial distribution of gray values,in the paper,from left to right,from top to bottom,each picture will be divided into nine regions.Three regions which from left to right are named as region left,middle and right;Three regions which from top to bottom are named as the region upper,middle and lower.Analyzing gray value of block area of image,obtain that the gray values present layered phenomenon along the height.Three regional gray value of each column also have good layered phenomenon.When the volume of traffic increases,the layered phenomenon between three areas also exits.Analyzing gray value of block area of image,the central area is the main area of gray value of the bubbles cluster,the gray value-time curve of the central area has a good similarity with the gray value-time curve,and the central area is the best match area of bubbles cluster.When the volume of traffic increases,the position that the central area is the main area of gray value of the bubbles cluster is not changed.And the central area also is the best match area of bubbles cluster.This paper's investigations all base on the gray feature of bubbles cluster in water,the results reveal that the gray value of the water bubble clusters could reflect the volume flow and distribution of the water bubble clusters.This method will help test the volume flow and distribution of the water bubble clusters of unknown area.