Exam_1_2005

Exam_1_2005 - EGN 6812 Fluid Mechanics I Fall 2005 Exam 1...

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EGN 6812 - Fluid Mechanics I – Fall 2005 10/11/05, Exam 1 Name: ______________________ 1/11 Questions: (20 points total, 4 points each, unless otherwise marked) 1. Provide a physical explanation of Stokes’ hypothesis ( i.e., not an equation) and describe when it is and is not valid for the specific case of a polyatomic molecule in a compressible flow . 2. () j ij i uT x is the surface work term due to surface forces in the energy equation. Mathematically decompose this term into pressure and viscous forces. Then further decompose this into components that increase/decrease kinetic and internal energy. Clearly label your terms and explain your answer in terms of forces, velocities, and deformations . 3. At a planar air/water interface, what are the appropriate boundary conditions for the continuity and momentum equations for incompressible flow without mass transfer? What approximations can be made? What additional forces would become important if the interface was curved?

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EGN 6812 - Fluid Mechanics I – Fall 2005 10/11/05, Exam 1 Name: ______________________ 2/11 Questions: (20 points total, 4 points each, unless otherwise marked) 4. Considering both length scale and time scale arguments, state when the continuum assumption is not valid? 5. The coefficient of viscosity is strictly a function of pressure and temperature. What is the dependence for increasing/decreasing pressure and temperature for the dynamic viscosity for both a gas and a liquid ? Please provide a physical explanation.
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Exam_1_2005 - EGN 6812 Fluid Mechanics I Fall 2005 Exam 1...

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