Ch 9. External Flow Multimedia Engineering Fluids Drag Lift BoundaryLayer
 Chapter 1. Basics 2. Fluid Statics 3. Kinematics 4. Laws (Integral) 5. Laws (Diff.) 6. Modeling/Similitude 7. Inviscid 8. Viscous 9. External Flow 10. Open-Channel Appendix Basic Math Units Basic Equations Water/Air Tables Sections Search eBooks Dynamics Fluids Math Mechanics Statics Thermodynamics Author(s): Chean Chin Ngo Kurt Gramoll ©Kurt Gramoll

 FLUID MECHANICS - CASE STUDY Introduction Problem Graphic Andy, the manager of EZ Trucking, would like to convince his boss to invest in installing air deflectors on their 18-wheelers. Research has shown that the drag coefficient, CD, is lower for an 18-wheeler with an air deflector (from 0.95 to 0.75). How can he show that the air deflector will save the company a small fortune? Questions What is the drag exerted on the 18-wheeler with and without the air deflector? Approach The drag force is directly proportional to the fuel consumption. Base the analysis on a frontal area, A, of 100 ft2. Assume the 18-wheeler runs at an average speed of 65 mph on the highway.

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