The Drag Force Analysis and Phenomenon Study of Liquid Droplets in Liquid-Liquid system

• Main Authors: Chi-Chung Tien, 田其錩
• Other Authors: 王興華
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/03846813906158498677

碩士 === 國立臺灣大學 === 機械工程學研究所 === 89 === The experiments discuss the drag and phenomenon vibration of liquid droplets which fall or rise in liquid-liquid system. The temperature is controlled between 20-23℃,and the pressure is 1atm. To avoid the mass transition, we use water, heptane, dodecane and hexadecane to be as for the droplet and the continued fluid. The range of Reynolds numbers are between 0.2 to 2200. The present data shows that the drag coefficients, for all fall or rise systems,whould be decreased gradually, reached a minimum, and then rise rapidly. The reasons can be solved by the effectivies of surface flow, internal flow, and deformation . After the critical Reynolds numbers, the development of oscillations lead to lower velocities. Otherwise,the velocities are just dependent upon their physical properties. In general, the higher density difference and the lower interfacial tension lead to the easier oscillation, and the fall or rise path of droplets are zigzag.