中文摘要：

气泡生成过程中气液传质是气液接触设备的设计、优化的重要参考指标。以二氧化碳气泡在羧甲基纤维素钠（carboxymethyl cellulose，CMC）溶液中生成过程中的传质为研究对象，分别考察了气速、CMC溶液浓度、针头直径对气泡生成过程气液传质的影响，采用具有 CCD 显微相机的动态接触角分析仪测量了气泡形状、表面积和体积的变化，进而获得气泡生成过程气液传质系数kl。实验结果表明，CMC浓度从0.2%增加到0.8%，黏度逐渐增大，传质系数随CMC浓度的增大而增大；针头直径从2.5 mm增加到4 mm，传质系数也随之增大；气速从1 ml·min-1增加到9 ml·min-1，传质系数也逐渐增大。

英文摘要：

The mass transfer process of growing bubbles has important effect on the design and optimization of gas-liquid contacting devices. By investigating a single carbon dioxide bubble growing in a sodium carboxymethyl cellulose （CMC） solution, the effects of gas velocity, concentration of CMC solution, and diameter of the needle on gas-liquid mass transfer were examined. The shape, surface area and volume of growing bubble were captured by a dynamic contact angle analysis instrument with a micro-CCD camera and the liquid mass transfer coefficient kl was calculated. The results show that the mass transfer coefficient increased with the solution viscosity as CMC concentration increased from 0.2% to 0.8%, with the diameter of the needle changing from 2.5 mm to 4 mm, and with the gas injection rate increased from 1 ml·min-1 to 9 ml·min-1.