In studying sand transport by ocean waves, A. Shields in1936 postulated that the threshold wave-induced bottomshear stress τ required to move particles depends on gravityg , particle size d and density ρ p , and water density ρ andviscosity μ . Find suitable dimensionless groups of thisthe problem, which resulted in 1936 in the celebrated Shieldssand transport diagram.

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Q: e peculiar fluid at very low ry is still a very import ons:

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A: GIVEN:-  velocity of aircraft : V=200m/sdensity of air : ρair=1.2kg/m3length ratio of model and…

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Q: An airplane wing, with chord length of 1.5 m and span of 9 m, is designed to move through standard…

A: Air: ν1= 1.51×10-5 m2/sV1= 7.5 m/s Water: ν2= 1.00×10-6 m2/sV2= ? m/s Scale model= D2D1=110

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Q: We want to predict the drag force on a remote-control airplane as it flies through air having a…

A: Solution: Given Data: ρa=1.21 kg/m3μa=1.76×10-5 Pa-sVp=32 m/sD=75 mmρw=3 kg/m3μw=1.82×10-5 Pa-s…

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Q: P6.2 A 1:80 scale model of an aircraft was tested in air at 20C°moves with speed 40m/s a- What is…

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.