| Autor: |
El-Shazly Ym, Zidan Ma, Zaatout Aa |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Journal of Thermodynamics & Catalysis. |
| ISSN: |
2157-7544 |
| DOI: |
10.4172/2157-7544.1000194 |
| Popis: |
Agitated vessels are now being extensively used in many applications regarding water and wastewater treatment where reaction and physical treatment processes can occur at the wall. Thus, the aim of the present work is to study the flow pattern of double impeller agitated vessel and its effect on the rate of mass transfer at the wall. Three different configurations were studied: double Rushton turbine, and a combination of pitched blade turbine and Rushton turbine to form pumping up and pumping down configurations. The rotational speed and the distance between the impellers were varied. Computational Fluid Dynamic was used to evaluate the flow pattern in the vessel and the velocity distribution near the wall of the tank, while the limiting current technique was used to determine the value of mass transfer coefficient at different heights of the wall. The mass transfer coefficient was found to depend strongly on the position of the impellers and the speed of rotation. Moreover, the configuration of impellers has a noticeable effect. The results show the potential usefulness of the CFD technique as a tool for designing stirred reactors for different applications. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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