Wall Shear Stress Generated by a Bernoulli Pad: Hot-Film Anemometry and Model Testing
arxiv(2024)
摘要
The wall shear stress generated by a Bernoulli pad over a workpiece is of
interest for the particular application of non-contact biofouling mitigation
from ship hulls. The shear stress distribution has been determined numerically
in the literature; it is directly measured experimentally for the first time in
this paper. A constant temperature anemometer is used with a hot-film sensor
and water as the working fluid; the sensor is calibrated using fully developed
channel flow. Experiments with a Bernoulli pad accurately capture the magnitude
of the maximum shear stress and its location resulting from constriction of the
flow and flow separation due to sudden change in direction from axial to
radial. Several numerical models are tested against the experimental
measurements.
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