Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator
In order to understand the aeration performance of inverted umbrella aerator and bubble characteristics in aeration tank under different conditions, and to reveal the internal relationship between bubble characteristics and aeration performance, an experimental bench of dissolved oxygen concentratio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/10/2809 |
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| author | Cui Dai Jinnan Guo Jiawei Liu Liang Dong Houlin Liu |
| author_facet | Cui Dai Jinnan Guo Jiawei Liu Liang Dong Houlin Liu |
| author_sort | Cui Dai |
| collection | DOAJ |
| description | In order to understand the aeration performance of inverted umbrella aerator and bubble characteristics in aeration tank under different conditions, and to reveal the internal relationship between bubble characteristics and aeration performance, an experimental bench of dissolved oxygen concentration and high-speed photography was built. Logarithmic oxygen deficit values were fitted under various conditions. The images captured by high-speed photography were processed, then the bubble characteristics were extracted accurately. It was found that the standard oxygen mass transfer coefficient increased linearly with an increase of rotational speed at a certain immersion depth, and increased firstly then decreased with a decrease of immersion depth when rotational speed was kept constant. The bubble size ranged from 0 mm to 1.59 mm under different working conditions, and the variation of the gas holdup was the same as the standard oxygen mass transfer coefficient when the rotational speed and immersion depth were changing. It was shown that bubbles play a leading role in the process of oxygen mass transfer and have a great influence on oxygen mass transfer rate. |
| first_indexed | 2024-03-10T15:45:16Z |
| format | Article |
| id | doaj.art-e69ae0c9f1fd475e8c50826fdcf833c9 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T15:45:16Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-e69ae0c9f1fd475e8c50826fdcf833c92023-11-20T16:33:04ZengMDPI AGWater2073-44412020-10-011210280910.3390/w12102809Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella AeratorCui Dai0Jinnan Guo1Jiawei Liu2Liang Dong3Houlin Liu4School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, ChinaResearch Centre of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Centre of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Centre of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Centre of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaIn order to understand the aeration performance of inverted umbrella aerator and bubble characteristics in aeration tank under different conditions, and to reveal the internal relationship between bubble characteristics and aeration performance, an experimental bench of dissolved oxygen concentration and high-speed photography was built. Logarithmic oxygen deficit values were fitted under various conditions. The images captured by high-speed photography were processed, then the bubble characteristics were extracted accurately. It was found that the standard oxygen mass transfer coefficient increased linearly with an increase of rotational speed at a certain immersion depth, and increased firstly then decreased with a decrease of immersion depth when rotational speed was kept constant. The bubble size ranged from 0 mm to 1.59 mm under different working conditions, and the variation of the gas holdup was the same as the standard oxygen mass transfer coefficient when the rotational speed and immersion depth were changing. It was shown that bubbles play a leading role in the process of oxygen mass transfer and have a great influence on oxygen mass transfer rate.https://www.mdpi.com/2073-4441/12/10/2809aeration performancebubble characteristicsinverted umbrella aeratorstandard oxygen mass transfer coefficient |
| spellingShingle | Cui Dai Jinnan Guo Jiawei Liu Liang Dong Houlin Liu Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator Water aeration performance bubble characteristics inverted umbrella aerator standard oxygen mass transfer coefficient |
| title | Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator |
| title_full | Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator |
| title_fullStr | Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator |
| title_full_unstemmed | Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator |
| title_short | Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator |
| title_sort | experimental study on aeration performance and bubble characteristics of inverted umbrella aerator |
| topic | aeration performance bubble characteristics inverted umbrella aerator standard oxygen mass transfer coefficient |
| url | https://www.mdpi.com/2073-4441/12/10/2809 |
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