4. The water velocity at a certain point along a 1:10 scale model of a dam spillway is 5 m/s. What is the corresponding prototype velocity if the model and prototype operate in accordance with Froude number similarity? (Ans: 15.8 m/s)
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- The Stokes number, St, used in particle dynamics studies,is a dimensionless combination of five variables: accelerationof gravity g , viscosity μ , density ρ , particle velocity U ,and particle diameter D . ( a ) If St is proportional to μand inversely proportional to g , find its form . ( b ) Showthat St is actually the quotient of two more traditionaldimensionless groups.The Stokes number, St, used in particle-dynamics studies is a dimensionless combination of 5 variables: acceleration of gravity g, viscosity μ, density p, particle velocity U, and particle diameter D. If St is propotional to μ and inversely proportional to g, find its dimensionless form.Consider liquid flow of density ρ , viscosity μ , and velocityU over a very small model spillway of length scale L ,such that the liquid surface tension coefficient Y is important.The quantity ρ U 2 L / Y, in this case, is important and iscalled the( a ) capillary rise, ( b ) Froude number, ( c ) Prandtl number,( d ) Weber number, ( e ) Bond number
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