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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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