利用高速摄像技术研究气流通过浸没垂直导管口在液体中形成气泡的机理及其行为规律，分析导管内径、气体流量、导管口浸没深度和导管外径对气泡脱离直径的影响。结果表明：在导管内径分别为7、10和14 mm，气体流量在0~450 mL/s的条件下，气泡脱离直径随导管内径和气体流量的增加而增大；在浸没深度为0.05~1 m的条件下，导管口浸没深度对气泡脱离直径的影响很小可以忽略；当气体流量在100 mL/s以上，导管内径为10 mm、导管外径为14~26 mm时，随着导管外径的增加，气泡脱离直径减小。

The high speed camera shooting technology was utilized to investigate the mechanism governing the formation of a gas bubble in a liquid when gas was flowing out from the mouth of a vertical guide tube submerged in the said liquid and its variation law and analyze the influence of the inner diameter, gas flow rate, immersion depth of the mouth of the guide tube and the outer diameter of the guide tube on the diameter of the gas bubble at the time of separation. It has been found that when the inner diameter of the guide tube is 7,10 and 14 mm respectively, under the condition of the gas flow rate being in a range of 0-450 mL/s, the diameter of the gas bubble at the time of separation will increase with an increase of the inner diameter of the guide tube and the gas flow rate. Under the condition of the immersion depth of the mouth of the guide tube being in a range of 0.05-1 m, the depth under discussion has a very small influence on the diameter of the gas bubble at the time of separation and such an influence can be neglected. When the gas flow rate is above 100 mL/s, the inner diameter of the guide tube is 10 mm and its outer diameter falls in a range of 14-26 mm, the diameter of the gas bubble at the time of separation will decrease with an increase of the outer diameter of the guide tube.

O359+.1

国家自然科学基金（51266001、51466001）