Transcription of FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER …
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FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER …
1 FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER THEORY In order to complete this TUTORIAL you should already have completed TUTORIAL 1 and 2 in this series. This TUTORIAL examines BOUNDARY LAYER theory in some depth. When you have completed this TUTORIAL , you should be able to do the following. Discuss the drag on bluff objects including long cylinders and spheres. Explain skin drag and form drag. Discuss the formation of wakes. Explain the concept of momentum thickness and displacement thickness.
Calculate the drag force on each side of a thin smooth plate 2 m long and 1 m wide with the length parallel to a flow of fluid moving at 30 m/s. The density of the fluid is 800 kg/m3 and the dynamic viscosity is 8 cP. SOLUTION R x Wetted Area 1173.6 x 2 x 1 2347.2 N C x dynamic pressure 0.00326 x 360 x 10 1173.6 Pa 360 kPa 2 800 x 30 2 u
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