Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production
The wave-driven floating photobioreactors (PBRs) with advantages of easy in scaling-up, low energy inputs and low fabricating cost, hold great potential for massive and cost-energy effective microalgae production. However, their applications may be seriously challenged by intermittent waves that cou...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1095590/full |
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| author | Yunpeng Zhao Yunpeng Zhao Guangchen Jia Yuan Cheng Hongyu Zhu Zhanyou Chi Zhanyou Chi Haibin Shen Chenba Zhu Chenba Zhu |
| author_facet | Yunpeng Zhao Yunpeng Zhao Guangchen Jia Yuan Cheng Hongyu Zhu Zhanyou Chi Zhanyou Chi Haibin Shen Chenba Zhu Chenba Zhu |
| author_sort | Yunpeng Zhao |
| collection | DOAJ |
| description | The wave-driven floating photobioreactors (PBRs) with advantages of easy in scaling-up, low energy inputs and low fabricating cost, hold great potential for massive and cost-energy effective microalgae production. However, their applications may be seriously challenged by intermittent waves that could produce very poor mixing under poor wave conditions, leading to a significant reduction of biomass productivity or even collapse of the cultures. To improve the utilization efficiency of waves for efficient and stable microalgae production in the floating PBRs, this work aims at numerically studying the fluid-dynamics of the floating PBRs, as well as the effects from wave conditions, culture depth and three different PBRs’ structures of square, rectangular and circular types. The results showed that the liquid inside the floating PBRs follow a periodic sinusoidal and reciprocating flow, and the square PBR had aggressive mixing characteristics at high wave excitation frequency, while the rectangular PBR produced more intense mixing at low wave excitation frequency. Regarding the culture depth, the dependence of liquid mixing on the culture depth showed a decreasing trend. Moreover, the results indicated that the PBRs with a high culture depth had several dead zones, although there was apparent upward flow at the high excitation frequency. This work provides valuable insight into increasing the utilization efficiency of wave energy for mixing enhancement in the floating PBRs and their design. |
| first_indexed | 2024-04-10T19:10:43Z |
| format | Article |
| id | doaj.art-1ec74e4e4da743ae9fcaa4416bd626e5 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-10T19:10:43Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-1ec74e4e4da743ae9fcaa4416bd626e52023-01-30T16:19:01ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-01-011010.3389/fmars.2023.10955901095590Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae productionYunpeng Zhao0Yunpeng Zhao1Guangchen Jia2Yuan Cheng3Hongyu Zhu4Zhanyou Chi5Zhanyou Chi6Haibin Shen7Chenba Zhu8Chenba Zhu9State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, ChinaNingbo Institute of Dalian University of Technology, Ningbo, ChinaState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, ChinaNingbo Institute of Dalian University of Technology, Ningbo, ChinaNingbo Institute of Dalian University of Technology, Ningbo, ChinaNingbo Institute of Dalian University of Technology, Ningbo, ChinaSchool of Bioengineering, Dalian University of Technology, Dalian, ChinaNingbo Institute of Dalian University of Technology, Ningbo, ChinaCarbon Neutral Innovation Research Center, Xiamen University, Xiamen, ChinaFujian Key Laboratory of Marine Carbon Sequestration, Xiamen University, Xiamen, ChinaThe wave-driven floating photobioreactors (PBRs) with advantages of easy in scaling-up, low energy inputs and low fabricating cost, hold great potential for massive and cost-energy effective microalgae production. However, their applications may be seriously challenged by intermittent waves that could produce very poor mixing under poor wave conditions, leading to a significant reduction of biomass productivity or even collapse of the cultures. To improve the utilization efficiency of waves for efficient and stable microalgae production in the floating PBRs, this work aims at numerically studying the fluid-dynamics of the floating PBRs, as well as the effects from wave conditions, culture depth and three different PBRs’ structures of square, rectangular and circular types. The results showed that the liquid inside the floating PBRs follow a periodic sinusoidal and reciprocating flow, and the square PBR had aggressive mixing characteristics at high wave excitation frequency, while the rectangular PBR produced more intense mixing at low wave excitation frequency. Regarding the culture depth, the dependence of liquid mixing on the culture depth showed a decreasing trend. Moreover, the results indicated that the PBRs with a high culture depth had several dead zones, although there was apparent upward flow at the high excitation frequency. This work provides valuable insight into increasing the utilization efficiency of wave energy for mixing enhancement in the floating PBRs and their design.https://www.frontiersin.org/articles/10.3389/fmars.2023.1095590/fullmicroalgaefloating photobioreactorscomputational fluid dynamicsfluid-dynamicsnumerical simulation |
| spellingShingle | Yunpeng Zhao Yunpeng Zhao Guangchen Jia Yuan Cheng Hongyu Zhu Zhanyou Chi Zhanyou Chi Haibin Shen Chenba Zhu Chenba Zhu Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production Frontiers in Marine Science microalgae floating photobioreactors computational fluid dynamics fluid-dynamics numerical simulation |
| title | Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production |
| title_full | Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production |
| title_fullStr | Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production |
| title_full_unstemmed | Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production |
| title_short | Numerical study on the internal fluid mixing and its influencing mechanisms of the wave-driven floating photobioreactor for microalgae production |
| title_sort | numerical study on the internal fluid mixing and its influencing mechanisms of the wave driven floating photobioreactor for microalgae production |
| topic | microalgae floating photobioreactors computational fluid dynamics fluid-dynamics numerical simulation |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1095590/full |
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