Problem 3 The drag force exerted by water flowing past a submerged structural support for a monitoring station needs to

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Problem 3 The Drag Force Exerted By Water Flowing Past A Submerged Structural Support For A Monitoring Station Needs To 1 (110.08 KiB) Viewed 24 times

Problem 3 The drag force exerted by water flowing past a submerged structural support for a monitoring station needs to be determined. The station will be located in a river with an average temperature of 10°C and a flow velocity of 4 m/s. A 1:10 Vale model is built and placed in a wind tunnel. (a) What should the wind speed be in the wind tunnel if the air temperature is 20°C? Assume Reynolds number similarity. (b) Would the wind speed need to be larger or smaller if the air temperature was lower? Justify your answer. (c) If the measured drag force exerted on the model in the 20°C wind tunnel is 15.7 N, what will the force be on the submerged structure in the river? [Drag force is calculated using the equation FD = CopV222 where Cp is a dimensionless drag coefficient that depends on an object's geometry and l is a representative dimension. In this problem, both the model and the structure have the same value of CD.] =