Author(s): Chendi Zhang, Mengzhen Xu, Zhaoyin Wang
Linked Author(s):
Keywords: Limnoperna fortunei larvae, turbulence-generating materials, high frequency turbulence, mortality
Abstract: Golden mussel (Limnoperna fortunei) is an invading macro-invertebrate species in water transfer pipelines, easily leading to heavy biofouling and pipe clogging. The species invades the pipelines during its planktonic larva stage, which is suitable to be killed by high frequency turbulence. To explore the hydraulic characteristics and killing mechanism of turbulence in pipelines, plates with hole diameters of 3 mm (PP3) and 6 mm (PP6), and wires with mesh spacing of 3 mm (WM3) and 2 mm (WM2) have been selected as turbulence-generating materials (TGMs) and are installed in a 12. 6 m-long experimental pipe (average flow velocity?1 m/s) with a space of 50 cm. The downstream flow field of the TGMs is measured by an Acoustic Doppler Velocimeter (ADV). The experimental results illustrates that the TGMs triggers a disturbance of flow velocity both transversely and longitudinally downstream. The distribution of the downstream turbulence intensity of the TGMs presents mostly a uniform transverse pattern. The TGMs increases the frequency of the dissipation range in the energy spectra for turbulence and results in the decrease of the length scale of the dissipative eddies, i. e. the Kolmogorov length scale. The larvae-killing tests indicates that the veliger community would be heavily damaged when the dissipation range was in a similar or smaller length scale than the veliger body length
Year: 2017