The friction drag force for the given condition and when the velocity is doubled.
Explanation of Solution
Given:
Pressure is 1 atm.
Temperature is
Wind velocity is
Dimension of the wall is
Calculation:
Refer Table A-22 “Properties of air at 1 atm pressure” from Appendix 1 and obtain the following properties of air:
The Reynolds number is,
Thus the flow is turbulent. Hence the friction coefficient is given by,
The drag force is,
Thus, the drag force is
When the velocity is doubled:
The Reynolds number is,
Thus the flow is turbulent. Hence the friction coefficient is given by,
The drag force is,
Thus, the drag force when the velocity is doubled is
Treating the flow over the side wall as a flow over a flat plate is unrealistic because the separation bubble exists over most of the side panels of the house and the boundary layer equations does not hold good.
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Chapter 15 Solutions
Fundamentals of Thermal-Fluid Sciences
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