Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F15
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
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F15D
FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
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F15D1/002
by influencing the boundary layer
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F15D1/0025
using passive means, i.e. without external energy supply
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F15D1/003
comprising surface features, e.g. indentations or protrusions
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F15D1/0035
in the form of riblets
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