Detailed modeling of hydrodynamics, mass transfer and chemical reactions in a bubble column using a discrete bubble model

Abstract

A 3D discrete bubble model is adopted to investigate complex behavior involving hydrodynamics, mass transfer and chemical reactions in a gas-liquid bubble column reactor. In this model a continuum description is adopted for the liquid phase and additionally each individual bubble is tracked in a Lagrangian framework, while accounting for bubble-bubble and bubble-wall interactions via an encounter model. The mass transfer rate is calculated for each individual bubble using a surface renewal model accounting for the instantaneous and local properties of the liquid phase in its vicinity. The distributions in space of chemical species residing in the liquid phase are computed from the coupled species balances considering the mass transfer from bubbles and reactions between the species. The model has been applied to simulate chemisorption of CO 2 bubbles in NaOH solutions. Our results show that apart from hydrodynamics behavior, the model is able to predict the bubble size distribution as well as temporal and spatial variations of each chemical species involved.

Analysis of Effectiveness of Interphase Transfer in a Case of Purification of Biogas in Microbubbling Equipment with a Consideration of Chemisorption of Carbon Dioxide

“…Expression (20) can be used in temperature range 290-314 K. Ionic force is calculated according to the following expression (Darmana, et al, 2007): Diffusion coefficient СО 2 in alkali solution is defined according to the following equation (Bobilev, 2003):…”

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

“…[79]. Zhang et al [79] followed a procedure similar to that used by Darmana et al [78], although in this case an E-E approach was used to simulate flow, mass transfer, and chemical reactions in square cross-sectional bubble column [19]. Zhang et al studied physical and chemical absorption of CO 2 bubbles in water and in an aqueous sodium hydroxide (NaOH) solution.…”

“…[77,78]. Darmana et al [77,78] used LES with E-L approach to simulate flow, mass transfer, and chemical reaction in flat bubble column. They considered mass transfer, rate in liquid-phase momentum equation and reaction interfacial forces in the bubble motion equation.…”

Simple model for CO2 absorption in a bubbling water column

“…Integration in r from the bubble radius r 0 to infinity, and application of mass balance of the gas (pure-CO 2 ), of density ρ g =p g /(R g T), assuming time independence and constant liquid density, as in Darmana et al (2004), yields a simple expression for the total dissolution time, t d :…”