Lecture9_5

# Lecture9_5 - AME 331 Introduction to Fluid Mechanics...

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11/30/2010 1 AME 331 Introduction to Fluid Mechanics Chapter 9: External Incompressible Viscous Flow Prof. Jesse Little University of Arizona 12/1/10 1 Lecture Preview and Assignments Today 9.7-9.8 Read 9.8 HW 11 due Friday HW 12 due Friday 12/10 Can be submitted by email (PDF only) Last time . 2

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11/30/2010 2 Drag (9-7) Friction Drag (flat plate) Comes from wall shear Wall shear is related to near wall velocity gradient Stronger near wall velocity gradient means more drag force. Turbulent boundary layers create more drag than laminar Leading edge of flat plate creates a lot of drag Example Problem 9-2 Developed expressions for laminar and turbulent wall shear In dimensionless form we use skin friction coefficient, C f 3 Drag (9-7) Example problem 9-2 revisited Used expressions for wall shear, τ w and integrated to get drag force, F D . Could have used just drag coefficient C D We used the exact Blasius solution for this problem since it was laminar.
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