Mass transfer of chemical absorption of CO2 in a serpentine minichannel
| Autor: | Chunying Zhu, Youguang Ma, Zifan Pang, Shaokun Jiang, Taotao Fu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Mass transfer coefficient
Convection Materials science Precipitation (chemistry) General Chemical Engineering Bubble Flow (psychology) 02 engineering and technology General Chemistry Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Slug flow 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Physics::Fluid Dynamics Mass transfer Environmental Chemistry Absorption (chemistry) 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 414:128791 |
| ISSN: | 1385-8947 |
| Popis: | Based on the online method, the absorption kinetics and mass transfer of CO2 in potassium carbonate solution in a serpentine minichannel are studied. Three flow patterns are observed: slug-bubbly flow, slug flow, and slug flow with precipitation of SiO2. It is observed that the length of bubble decreases linearly with the increase of the travelling distance of bubble x in slug flow, based on which the volumetric mass transfer coefficient (kLa) is calculated. The results show that the average bubble velocity vb is only a function of the gas and liquid flow rates, and it remains unchanged in the whole flow process. Based on the online method, the instantaneous mass transfer coefficient, and instantaneous pH are studied. It’s found that the instantaneous mass transfer coefficients kLa and kL increase with the mass transfer of bubbles along the flow direction in the slug flow. It is concluded that the convection in the liquid slug plays a major role in controlling the mass transfer of fast chemical absorption in a serpentine minichannel. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect