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

Tang, Hao; Hu, Fuxiang; Xu, Liuxiong; Dong, Shuchuang; Zhou, Cheng; Wang, Xuefang

doi:10.1007/s11802-017-3227-6

Cited by 23 publications

(24 citation statements)

References 10 publications

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“…First, the drag coefficient formula for a knotless PA netting was derived based on Tauti’s theoretical formula, Kumazawa et al .’s 8 formula, and Tang et al .’s 3 formula to precisely estimate the hydrodynamic performance of a fishing gear at small attack angles. Considering the characteristic angle, the netting was set parallel to the flow, and a parallel drag coefficient was incorporated into the empirical formula.…”

Section: Resultsmentioning

confidence: 99%

“…Bi et al . 12 found a significant reduction in flow velocity downstream from the netting panel, and the shielding effect increased with increasing netting solidity ratio, i.e., with increasing solidity ratio, the flow velocity on downstream netting decreased significantly, leading to a relatively smaller force on the netting panel 3,12 . In addition, a nominally high solidity ratio was used to calculate the drag coefficient in the case of small attack angles, also resulting in a low value.…”

Section: Discussionmentioning

confidence: 96%

“…10 , and Tang et al . 3 . The drag coefficients of nettings made of three materials decreased with the increase in solidity ratio at small attack angles; this can be attributed to the “shielding effect” as the fluid is transferred from upstream to downstream strands.…”

Section: Discussionmentioning

confidence: 99%

“…Most previous studies evaluated fabric nets as a fishing gear material because it is difficult to predict how the nets change with ever-changing sea conditions. For a netting panel, drag depends on the netting area, flow velocity, solidity, Reynolds number, and attack angle; drag is affected by knot type, weave pattern, twine bending stiffness 1 , and netting-surface roughness 2,3 .…”

Section: Introductionmentioning

confidence: 99%

“…10 and Tang et al . 3 investigated the drag and lift coefficients of netting at an attack angle ranging from 0° to 90° with 10° interval; the drag coefficient rapidly changed at small attack angles, making the prediction difficult. Tang et al .…”

Section: Introductionmentioning

confidence: 99%

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Variations in hydrodynamic characteristics of netting panels with various twine materials, knot types, and weave patterns at small attack angles

Tang

et al. 2019

Sci Rep

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It is essential to conduct hydrodynamic experiments for fishing gear at small attack angles along the flow direction to better understand the hydrodynamic characteristics of netting and application of gear. The hydrodynamic characteristics of netting panels made of different materials at small attack angles were investigated by a self-designed setup; this is essential for the effective use of netting on different types of gears. As confirmed by experiments, the measured drag of designed frame without netting accounted for less than 20% of the total setup drag including experimental netting and remained in a steady state under various current speeds and small attack angles, indicating that the self-designed frame setup is suitable for such trials. The drag coefficient was determined by varying the attack angle, solidity ratio, Reynolds number, knot types, weave pattern, and twine materials at small attack angles. The results indicate that the drag coefficient increased as the attack angle increased, but decreased as the solidity ratio and Reynolds number increased. The drag generated by knot accounted for 21% of the total drag of nylon (PA) netting. For braided knotless netting, the drag coefficient of PA netting was about 8.4% lower than that of polythene netting (PE) and 7% lower than that of polyester netting (PES). Compared with twined netting, the braided netting exhibited a higher resistance to flow, corresponding to higher values of drag coefficient.

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Section: Resultsmentioning

confidence: 99%