Flow noise reduction from superhydrophobic surfaces
Om publikasjonen
This work investigates how a highly (super)hydrophobic
surface can be used to reduce turbulence-generated drag and
noise on a towed streamer cable. The work is done by analyzing
full-scale drag and flow noise measurements taken on
a commercial seismic streamer in combination with direct
numerical simulations of turbulence-generated flow noise.
The main findings are that viscous drag and flow noise
can be significantly reduced on a seismic streamer that is
coated to make the surface highly hydrophobic. In an ocean
towing test, a 4% reduction of drag on a streamer section
was measured. In a separate test on a commercial seismic
vessel, a reduction in the flow noise level of nearly 50%
(6 dB) for frequencies below 10 Hz was found. Based upon
an analysis of numerical simulation data, it is suggested that
the reduction in drag and noise can be attributed to a reduced
level of shear stress and change in the kinematic structure of
the turbulence, both of which occur in the immediate vicinity
of the highly hydrophobic surface.
surface can be used to reduce turbulence-generated drag and
noise on a towed streamer cable. The work is done by analyzing
full-scale drag and flow noise measurements taken on
a commercial seismic streamer in combination with direct
numerical simulations of turbulence-generated flow noise.
The main findings are that viscous drag and flow noise
can be significantly reduced on a seismic streamer that is
coated to make the surface highly hydrophobic. In an ocean
towing test, a 4% reduction of drag on a streamer section
was measured. In a separate test on a commercial seismic
vessel, a reduction in the flow noise level of nearly 50%
(6 dB) for frequencies below 10 Hz was found. Based upon
an analysis of numerical simulation data, it is suggested that
the reduction in drag and noise can be attributed to a reduced
level of shear stress and change in the kinematic structure of
the turbulence, both of which occur in the immediate vicinity
of the highly hydrophobic surface.
Utgiverinformasjon
Elboth, Thomas; Reif, Bjørn Anders Pettersson; Andreassen, Øyvind; Martell, Michael B.. Flow noise reduction from superhydrophobic surfaces. Geophysics 2012 ;Volum 77.(1) s. P1-P10