化工学报2016，Vol.67Issue(6)：2495-2502,8.DOI:10.11949/j.issn.0438-1157.20151867
表面张力对自由落体液滴形变的影响
Effect of surface tension on deformation of free falling drops
摘要
Abstract
The deformation of moving drop plays an important role in its evaporation and combustion. Surface tension is one of the factors which influence the deformation. For investigating the effect of surface tension on the deformation, the low concentration SDBS surfactant water based solutions with surface tension in the range of 30 to 72 mN·m−1 are used as the experimental liquid. The different sizes of needles are employed to get drops with diameter at 3—5 mm. The image processing is utilized to analyze the drop shape by using a high speed camera (Phantom V211, 1000 pps,800×600 pixel). The complete drop falling image process is assembled by 9 sections at different position with different drops. A stable drop formation time of (2.4±0.1) s makes the dispersion of size and initial velocity of these drops meet the experimental accuracy. Analyzing the experimental data by Image-pro plus obtains the semi-empirical correlations of Eötvös number (Eo). The results show that the period and amplitude of drop deformation decrease with increasing surface tension. Furthermore, the momentum transfer inside the drop causes initial transient impulse, which makes the drop periodic deformation when it falls down.关键词
蒸发/表面活性剂/表面张力/动量传递/液滴/形变/Eötvös数Key words
evaporation/surfactants/surface tension/momentum transfer/drop/deformation/Eötvös number分类
数理科学引用本文复制引用
丁思源,王瑞祥,徐荣吉,张一灏,蔡骥驰..表面张力对自由落体液滴形变的影响[J].化工学报,2016,67(6):2495-2502,8.基金项目
国家自然科学基金项目（51506004）。@@@@supported by the National Natural Science Foundation of China (51506004) （51506004）
