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The effect of netting solidity ratio and inclined angle on the hydrodynamic characteristics of knotless polyethylene netting

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Abstract

Knotless polyethylene (PE) netting has been widely used in aquaculture cages and fishing gears, especially in Japan. In this study, the hydrodynamic coefficient of six knotless PE netting panels with different solidity ratios were assessed in a flume tank under various attack angles of netting from 0° (parallel to flow) to 90° (perpendicular to flow) and current speeds from 40 cm s−1 to 130 cm s−1. It was found that the drag coefficient was related to Reynolds number, solidity ratio and attack angle of netting. The solidity ratio was positively related with drag coefficient for netting panel perpendicular to flow, whereas when setting the netting panel parallel to the flow the opposite result was obtained. For netting panels placed at an angle to the flow, the lift coefficient reached the maximum at an attack angle of 50° and then decreased as the attack angle further increased. The solidity ratio had a dual influence on drag coefficient of inclined netting panels. Compared to result in the literature, the normal drag coefficient of knotless PE netting measured in this study is larger than that of nylon netting or Dyneema netting.

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Acknowledgements

This study was supported financially by the National High Technology Research and Development Program of China (No. 2012AA092302), the Shanghai Education Commission ‘Summit and Highland’ Discipline Construction for Fisheries Sciences (No. B2-5005-13-0001-5), the open funding for the Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources (No. A- 0203-16-2007-6), the Public Projects of Research on Technology and Application in Zhejiang Province (No. 2016C33083) and the National Natural Science Foundation of China (No. 41506151). We also then extend our thanks to Dr. He Pingguo for his correcting the manuscript and constructive criticism for revising the manuscript.

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Authors and Affiliations

  1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, P. R. China

    Hao Tang, Liuxiong Xu & Xuefang Wang

  2. Faculty of Marine Science, Tokyo University of Marine Science and Technology, Minato, Tokyo, 108-8477, Japan

    Fuxiang Hu & Shuchuang Dong

  3. National Engineering Research Center for Oceanic Fisheries, Shanghai, 201306, P. R. China

    Liuxiong Xu & Xuefang Wang

  4. Shanghai Collaborative Innovation Center for Oceanic Fisheries, Shanghai, 201306, P. R. China

    Liuxiong Xu & Xuefang Wang

  5. College of Fisheries, Zhejiang Ocean University, Zhoushan, 316000, P. R. China

    Cheng Zhou

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  1. Hao Tang
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  2. Fuxiang Hu
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  3. Liuxiong Xu
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  4. Shuchuang Dong
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  5. Cheng Zhou
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Correspondence to Liuxiong Xu.

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Tang, H., Hu, F., Xu, L. et al. The effect of netting solidity ratio and inclined angle on the hydrodynamic characteristics of knotless polyethylene netting. J. Ocean Univ. China 16, 814–822 (2017). https://doi.org/10.1007/s11802-017-3227-6

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  • DOI: https://doi.org/10.1007/s11802-017-3227-6

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