Measurement of droplet coalescence in a mixing tank

In this study, a method was firstly developed to directly measure the droplet coalescence frequency in turbulent flow field by using a specially designed mixing tank and a high-speed camera. The effects of the rotating speed and holdup fraction on the droplet coalescence frequency were quantitatively investigated. The increasing of rotation speed promotes first and then inhibits the coalescence, while the holdup fraction has little influence on the coalescence frequency function. The droplet collision frequency was also counted and the coalescence efficiency was calculated. The models in the literature were tested with our experimental data and were found failing to predict the coalescence frequency in the stirring tank. Empirical correlation was finally proposed and good agreement was found between the prediction results and the experimental data.

Source: AIChE Journal - December 30, 2023 Category: Science Authors: Yubin Cai, Zhongshu Yang, Yijing Jin, Shan Jing, Wenjie Lan, Shaowei Li Tags: RESEARCH ARTICLE Source Type: research