Hydrodynamic characteristics of plane minnow netting made of high-strength polyethylene (Dyneema)

Abstract

The hydrodynamic characteristics of minnow netting composed of high-strength polyethylene (Dyneema) with different types of twine diameter and mesh size were evaluated through experiments conducted in a flume tank. The drag coefficient C D90 of Dyneema minnow netting set normal to the water flow was 8% and 25% smaller than that of minnow netting made of the conventional materials of polyamide and polyvinyl alcohol, respectively. The drag coefficient C D0 of minnow netting set parallel to the water flow showed a slight difference between the materials. Additionally, C D90 and C D0 were expressed as functions of Reynolds number and mesh factor α Furthermore, the drag and lift coefficients of minnow netting set at various angles to the water flow were estimated by empirical equations as functions of C D90, C D0 and attack angle θ.