Hydrodynamics in a Bubble Column – Part 1: Two‐Phase Flow

Abstract

Multiphase computational fluid dynamics (CFD) simulation is a useful tool to study the hydrodynamics in a bubble column if appropriate closure models are known. Systematic assessment of different models is an ongoing venture that benefits from improved validation data. The present study accumulates a database on two-phase flow experiments in a bubble column. This is achieved by using a combination of particle image velocimetry and shadowgraphy to measure the liquid velocity field and gas dispersion properties simultaneously. This methodology is applied for different needle diameters and gas flow rates. The experimental data are compared with CFD simulations which show good predictions. A systematic investigation of the three-phase flow in the bubble column will appear as a sequel.

Feasibility and Advantages of Continuous Synthesis of Bioinspired Silica Using CO2 as an Acidifying Agent

“…The mass transfer time scale of ∼10 2 s was found to be adequate in the lab scale. Considering that bubble size and volume fraction can be maintained during the scale-up, it is possible to maintain mass transfer performance in the scaled-up reactor similar to the lab scale. − A low-aspect ratio bubble column reactor is recommended to facilitate good mixing. Controlling the pH of the reactor and subsequent elution step is critical for achieving the desired performance and will be a key challenge for scaling up.…”