Abstract
Abstract - The formation behavior of a single bubble in power-law fluids (carboxymethyl cellulose solution, CMC) and Newtonian fluids (glycerol solution) was experimentally investigated via a high-speed camera. The effects of liquid property, orifice diameter and gas flow rate on bubble volume and aspect ratio were observed. It was found that the formation time and detaching volume increased with the increase of fluid viscosity. The increase of bubble aspect ratio during the bubble formation process was complex, with main emphasis on the decrease in the initial stage and an increase in the final stage along with the shear thinning property variation. Nevertheless, the bubble detaching volume, instantaneous volume and formation time increased following the increase of orifice diameter and gas flow rate. On the contrary, the bubble aspect ratio decreased with the orifice diameter increase but increased with a higher gas flow rate. Keywords : Bubble formation; Power-law fluids; Rheological property; Bubble volume; Aspect ratio.
Highlights
The bubble motion in liquid phases is broadly encountered in many industrial processes, such as chemical, biochemical, mineral and environmental processes (Chhabra, 2006; Li et al, 2012)
A profound understanding of the bubble formation process in liquid phases is essential for optimizing the design of gas-liquid equipment, and significant efforts have been devoted in the last few decades
The viscosity and rheological property play a notable role in bubble shape evolution
Summary
The effects of liquid property, orifice diameter and gas flow rate on bubble volume and aspect ratio were observed. It was found that the formation time and detaching volume increased with the increase of fluid viscosity. The increase of bubble aspect ratio during the bubble formation process was complex, with main emphasis on the decrease in the initial stage and an increase in the final stage along with the shear thinning property variation. The bubble detaching volume, instantaneous volume and formation time increased following the increase of orifice diameter and gas flow rate. The bubble aspect ratio decreased with the orifice diameter increase but increased with a higher gas flow rate.
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