f12_mud_0304

F12_mud_0304 - Lecture F12 Mud Energy Conservation ˙ E 1 What’s the difference between dE/dt and E ˙ flow(1 student dE/dt is the rate of

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Unformatted text preview: Lecture F12 Mud: Energy Conservation ˙ E 1. What’s the difference between dE/dt and E ˙ flow ? (1 student) dE/dt is the rate of change of energy contained by the mass already in the volume. flow is haw fast energy is being brought into or out of the volume by inflowing and outflowing mass. ˙ 2. What’s the difference between Q ˙ viscous and W viscous ? (1 student) Imagine a viscous friction force F f rubbing on the surface of the CV, much like a boundary layer “rubs” on the surface of an airfoil. This force does work if there is ˙ fluid velocity at the point of application, W viscous = F f · V . But if there’s a friction force, there must also be frictional heating present (a boundary layer is always slightly warmer than the effectively-inviscid fluid next to it). This excess heat will flow into the CV, and constitute Q ˙ viscous . 3. How do the physical definitions of h and h o and h o differ? (1 student) The static enthalpy h measures only the energy of the molecules...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.

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F12_mud_0304 - Lecture F12 Mud Energy Conservation ˙ E 1 What’s the difference between dE/dt and E ˙ flow(1 student dE/dt is the rate of

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