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Exam_2_2008

# Exam_2_2008 - EAS 4101 Aerodynamics Spring 2008 Exam 2 Name...

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EAS 4101 - Aerodynamics – Spring 2008 04/04/08, Exam # 2 Name: __________________________________ 1 I. TRUE/FALSE (7 points total - 1 point each) 1. Momentum and energy are transferred by molecular diffusion in turbulent flow. 2. Fluid particles within a viscous boundary layer near a solid wall are rotational and, hence, posses vorticity. 3. In Couette flow, the source of the flow is caused by the boundary conditions. 4. In Hagen Poiseuille flow, pressure balances shear stress. 5. Skin friction drag is mainly due to axisymmetric pressure distribution largely due to separation. 6. Laminar boundary layers are thicker than turbulent boundary layers. 7. Turbulent boundary layers have higher skin friction than laminar boundary layers. II. MULTIPLE CHOICE (6 pts total - 3 pts each unless otherwise marked): There may be more than one correct answer. To receive full credit, circle ALL of the correct answers. 7. Which assumption(s) is(are) NOT used to derive the boundary layer equations: a) 2-D b) Incompressible c) Fully developed d) Irrotational e) Inviscid f) Steady 8. What assumption(s) is(are) required to transform the Navier-Stokes Equations into Euler’s equations? a) Fully Developed b) Incompressible c) Inviscid d) Irrotational e) Steady III. SHORT ANSWER (33 pts total - 3 pts each unless otherwise marked): Answer all parts of the question to receive full credit. 9. What does the Reynolds number represent the ratio of in terms of typical forces? 10. What is the dx dp term equal to in the “boundary layer” equations (reduced form of the Navier-Stokes equations) for a boundary layer possessing an edge velocity of U ?

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Exam_2_2008 - EAS 4101 Aerodynamics Spring 2008 Exam 2 Name...

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