Q: Consider laminar flow over a flat plate. How does the local
Consider laminar flow over a flat plate. How does the local friction coefficient change with position? Answer: We are to discuss how the local skin friction coefficient changes with position along a...
See AnswerQ: In general, how does the drag coefficient vary with the Reynolds
In general, how does the drag coefficient vary with the Reynolds number at (a) low and moderate Reynolds numbers and (b) at high Reynolds numbers (Re > 104)?
See AnswerQ: A car is moving at a constant velocity of 110 km/
A car is moving at a constant velocity of 110 km/h. Determine the upstream velocity to be used in fluid flow analysis if (a) the air is calm, (b) wind is blowing against the direction of motion of the...
See AnswerQ: The resultant of the pressure and wall shear forces acting on a
The resultant of the pressure and wall shear forces acting on a body is measured to be 430 N, making 30° with the direction of flow. Determine the drag and the lift forces acting on the bod...
See AnswerQ: On a hot summer day, a student turns his fan on
On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighboring rooms? Why? Assume all th...
See AnswerQ: What is lift? What causes it? Does wall shear contribute
What is lift? What causes it? Does wall shear contribute to the lift?
See AnswerQ: During a high Reynolds number experiment, the total drag force acting
During a high Reynolds number experiment, the total drag force acting on a spherical body of diameter D = 12 cm subjected to airflow at 1 atm and 5°C is measured to be 5.2 N. The pressure drag actin...
See AnswerQ: The drag coefficient of a car at the design conditions of 1
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90 km/h is to be determined experimentally in a large wind tunnel in a full-scale test. The height and width of the car are 1...
See AnswerQ: To reduce the drag coefficient and thus to improve the fuel efficiency
To reduce the drag coefficient and thus to improve the fuel efficiency, the frontal area of a car is to be reduced. Determine the amount of fuel and money saved per year as a result of reducing the fr...
See AnswerQ: Reconsider Prob. 15–22E. Using appropriate software, investigate
Reconsider Prob. 15–22E. Using appropriate software, investigate the effect of frontal area on the annual fuel consumption of the car. Let the frontal area vary from 10 to 30 ft2 in increments of 2 ft...
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