Study of bubble behavior in high-viscosity liquid in a pseudo-2D column using high-speed imaging

Bubbles, as a critical microscale phenomenon, play an important role in determining the performance of gas-liquid transport and reactions. Reactors should be designed and scaled up suitably to investigate their bubble dynamics, which is generally influenced by the liquid viscosity. Compared to low-viscosity systems, high-viscosity systems have rarely been investigated for their bubble behavior (espe-cially their bubble swarm behavior, which is often involved in relevant industrial processes). This paper reports a case study of nitrogen-glycerin viscous systems, conducted via high-speed imaging. Bubbly flows with naturally generated interactions and collisions are investigated quantificationally, and the special conjunct bubble is observed qualitatively. The correlation of equivalent bubble diameters is obtained for the relevant viscous system by fitting the experimental results. The aspect ratio that char-acterizes the bubble shape is correlated, and a novel EoRe-E equation is derived.CO 2022 Elsevier Ltd. All rights reserved.

Automated summary

This paper investigates the behavior of bubbles in high-viscosity systems using high-speed imaging. The results show that the liquid viscosity plays a crucial role in determining the shape and dynamics of bubbles. The correlation between bubble diameter and shape for the relevant viscous system is obtained by fitting the experimental results. This study is of great importance for optimizing the design of relevant industrial processes.