Improved Correlation for the Volume of Bubble Formed in Air-Water System

• Published in: Chinese journal of chemical engineering 2011-06, Vol.19 (3), p.529-532
• Main Author: 王红一 董峰 卞聿晨 谭超
• Format: Article
• Language: English
• Subjects: bubble formed volume; Bubbles; Correlation; Digital; gas orifice diameter; gas volume flow rate; High speed; high-speed image; Image processing; Mathematical models; Surface tension; 实验数据; 数字图像处理技术; 气体流量; 气泡体积; 水系统; 泡沫量; 空气; 表面张力
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(11)60017-7

In order to address the bubble formation and movement in air-water two-phase flow,single bubble rising in stagnant water is experimentally studied by digital image processing.Bubbles are released individually from the submerged orifices with different diameters（1.81 mm,2.07 mm,2.98 mm,3.92 mm）at different detachment frequency.Images are recorded by a high-speed video camera and processed by digital image processing technique. The factors impacting the formed volume of bubble are discussed.The experimental results showed that a threshold of gas flow rate（400 mm 3 ·s- 1）divides the bubble formation into two regimes：the constant volume regime and the growing volume regime.Especially for the growing volume regime,the surface tension is taken into account.The bubble volume is consisted of two parts：the surface tension impacting part and the gas volume flow rate impacting part.An improved correlation for bubble volume prediction is developed for the two regimes and better coincidence with the experiment data than the previous models is obtained.