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Design and optimization of a new tube aeration device

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Abstract

With the intensification and industrialization of aquaculture, there is an urgent need for new high-performance aeration devices and energy-saving aeration technology to achieve oxygen saturation. Based on the oxygen transfer equation between air and water two-phase and the Venturi principle, a new tube aeration device was designed, developed, and tested in an attempt to solve these problems. The structural parameters affecting the aeration performance were identified and examined, and optimization experiments were undertaken to enhance the design of this aeration and oxygenation energy-saving technology. The key structural parameters were determined to be the air-water mixing distance, the height of the air hole under the water surface, the ratio of the entrance diameter to the throat diameter, the spiral mixing structure, and the air inlet size. These parameters, together with the airflow rate, influenced the aeration efficiency. Within certain limits, the larger the ratio of the entrance to the throat, the larger the air inlet size was, the more adequate the airflow rate was, and the greater the height of the air hole under the water surface was, the greater the oxygenation efficiency was. However, the additional length and the addition of a spiral mixing structure increased the head loss, reduced the airflow rate, and reduced the aeration and oxygenation efficiency.

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Abbreviations

RAS:

Recirculation aquaculture systems

DO:

Dissolved oxygen concentration in water

PVC:

Polyvinyl chloride

θ:

Temperature correction factor

C:

Concentration of oxygen at time t (mg L−1)

C0 :

Dissolved oxygen (DO) concentration at time t = 0 (mg L−1)

Cs:

Oxygen saturation at standard conditions (mg L−1)

Qs:

Oxygenation capacity

KLa:

Oxygen transfer coefficient (min−1)

KLa20 :

Clean water oxygen transfer coefficient at 20 °C (h−1)

εs :

Oxygen utilization efficiency

SOTR:

Standard oxygen transfer rate (kg O2 h−1)

SAE:

Standard aeration efficiency (kg O2 kW−1 h−1)

Hw:

Height of the air hole above the water surface (mm)

D1:D2:

Reducer diameter reduction ratio

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Acknowledgments

We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

Funding

This research was supported by the China Agriculture Research System (CARS-47-G20). Other support was provided through the Open Project by the Key Laboratory of Fishery Equipment and the Engineering, Ministry of Agriculture, China.

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Authors and Affiliations

  1. Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200092, People’s Republic of China

    Chenglin Zhang, Jianjun Shan, Qi Ni & Fan Wu

  2. College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, 201306, People’s Republic of China

    Chenglin Zhang & Shiming Wang

  3. Linde Gas Shanghai Co., Ltd., Shanghai, 201206, People’s Republic of China

    Benben Song

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  1. Chenglin Zhang
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  2. Benben Song
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  3. Jianjun Shan
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Correspondence to Chenglin Zhang.

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Zhang, C., Song, B., Shan, J. et al. Design and optimization of a new tube aeration device. Aquacult Int 28, 985–999 (2020). https://doi.org/10.1007/s10499-020-00507-2

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