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Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency. Processes (Basel) 2020. [DOI: 10.3390/pr8111498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A novel auto-aspirated sparger is examined experimentally in a closed-loop reactor (CLR) at lab scale using particle image velocimetry, high-speed camera and oxygen mass transfer rate measurements. State-of-the-art 3D printing technology was utilized to develop the sparger design in stainless steel. An insignificant change in the bubble size distribution was observed along the aerated flow, proving the existence of a low coalescence rate in the constraint domain of the CLR pipeline. The studied sparger created macrobubbles evenly dispersed in space. In pure water, the produced bubble size distribution from 190 to 2500 μm is controlled by liquid flow rate. The bubble size dynamics exhibited a power-law function of water flow rate approaching a stable minimum bubble size, which was attributed to the ratio of the fast-growing energy of the bubble surface tension over the kinetic energy of the stream. Potentially, the stream energy can efficiently disperse higher gas flow rates. The oxygen transfer rate was rapid and depended on the water flow rate. The aeration efficiency below 0.4 kW/m3 was superior to the commonly used aerating apparatuses tested at lab scale. The efficient gas dissolution technology has potential in water treatment and carbon capture processes applications.
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Chen J, Meng C, Wang S, Song X. Gas-Solid Flow in an Airlift Loop Reactor: A Cluster Structure-Dependent Drag Model. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Juhui Chen
- Harbin University of Science and Technology; School of Mechanical Engineering; 150080 Harbin China
| | - Cheng Meng
- Harbin University of Science and Technology; School of Mechanical Engineering; 150080 Harbin China
| | - Shuai Wang
- Harbin Institute of Technology; School of Energy Science and Engineering; 150001 Harbin China
| | - Xiaojiao Song
- Harbin Institute of Technology; School of Energy Science and Engineering; 150001 Harbin China
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Mießner U, Kück UD, Dujardin V, Heithoff S, Räbiger N. Correlation for kLaPrediction of Airlift Loop Reactors Including the Gas Phase Residence Time Effect. Chem Eng Technol 2015. [DOI: 10.1002/ceat.201500154] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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