A sign is being towed at a constant velocity of 4 m/s at an altitude of 100 m where air has a density of 1.20 kg/m³ and absolute viscosity of 1.5 x 10$ Pa-s. Assume that the sign has the same resistance characteristics as a flat plate and neglect the effect of the plane on the free-stream velocity. a) the boundary layer is laminar or turbulent. b) c) What is the boundary layer thickness at the tail end of the sign? Indicate whether What is the boundary shear stress at the tail end of the sign? Estimate the power required to tow the sign. 2.0 m FLUID MECHANICS FOR ALL ENGINEERS 30 m
A sign is being towed at a constant velocity of 4 m/s at an altitude of 100 m where air has a density of 1.20 kg/m³ and absolute viscosity of 1.5 x 10$ Pa-s. Assume that the sign has the same resistance characteristics as a flat plate and neglect the effect of the plane on the free-stream velocity. a) the boundary layer is laminar or turbulent. b) c) What is the boundary layer thickness at the tail end of the sign? Indicate whether What is the boundary shear stress at the tail end of the sign? Estimate the power required to tow the sign. 2.0 m FLUID MECHANICS FOR ALL ENGINEERS 30 m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A sign is being towed at a constant velocity of 4 m/s at an altitude of 100 m where air has
a density of 1.20 kg/m³ and absolute viscosity of 1.5 x 10-5 Pa-s. Assume that the sign has
the same resistance characteristics as a flat plate and neglect the effect of the plane on the
free-stream velocity.
a)
the boundary layer is laminar or turbulent.
b)
What is the boundary layer thickness at the tail end of the sign? Indicate whether
What is the boundary shear stress at the tail end of the sign?
Estimate the power required to tow the sign.
2.0 m
FLUID MECHANICS FOR ALL ENGINEERS
30 m
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