Mass transfer characteristics for CO2 absorption in nanoabsorbents
| Autor: | Yong Tae Kang, Hwan Suk Lim, Lirong Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Work (thermodynamics) Materials science Mechanical Engineering Bubble 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Upper and lower bounds 010305 fluids & plasmas Physics::Fluid Dynamics chemistry.chemical_compound chemistry Drag Mass transfer 0103 physical sciences Volume fraction Methanol 0210 nano-technology Pressure gradient |
| Zdroj: | International Journal of Heat and Mass Transfer. 129:650-659 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2018.10.005 |
| Popis: | In this work, an improved VOF-PLIC model is developed to simulate 3D bubble behavior and to analyze the mass transfer characteristics for CO2 absorption in pure methanol and methanol with Al2O3 nanoparticles. The lower bound boundary value of CO2 volume fraction( α g ) is redefined according to the influence of α g on bubble shape and diameter as well as the interfacial area between gas and liquid. In addition, a reasonable drag force is added into the momentum equation using UDF code based on the assumption that the drag force only exists in liquid phase. It is found that the level lines of bubbles with the α g value of 0.05 agree well with the real case, and the drag force has significant influence on the bubble behavior and mass transfer characteristics. The velocity contours and pressure gradients around the bubble are proposed to analyze the influence of drag force on the mass transfer characteristics. Also, the influence of the Al2O3 nanoparticles on the mass transfer enhancement is studied, and the results show that the dispersed particles can significantly enhance the mass transfer by increasing the gas–liquid interfacial surface renewal frequency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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