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f6_mud

# f6_mud - wherever the pressure increases such as just in...

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Lecture F6 Mud: Control Volumes, Mass Conservation (33 respondents) 1. The 18.02 math stuff in the lecture was rather complex. (3 students) Yes, but it’s tough to avoid when doing Fluids. I’ll try to review the math concepts as they come up. 2. How do you calculate the divergence? (1 student) Using its definition. In the general continuity equation the vector in question is V = �u ˆ ı + �v ˆ+ �w ˆ k , so we calculate: � · ( ( �u ) ( �v ) ( �w ) V ) = + + �x �y �z If is a constant (low-speed ﬂow), it can be taken outside the derivatives, but not in general. 3. How can one increase volume and decrease density in the steady ﬂow equa- tion? (1 student) In a steady low speed ﬂow ( M 2 1), the only way to decrease the gas density is to add heat to it, as in the heater-in-pipe PRS question. In high-speed ﬂow ( M 2 not small), density
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Unformatted text preview: wherever the pressure increases, such as just in ±ront o± an air±oil leading edge. In liquids the density is pretty much constant no matter what happens, short o± boiling. 4. Didn’t understand how you got − 1 V 1 A 1 + 2 V 2 A 2 = (1 student) I’ll go over this again on Monday. 5. There’s a typo in the notes (“mass ﬂux” should be “mass ﬂow” in one equation). (1 student) Thanks. It’s fxed. The Fluids notes this term will be hot out o± the oven, so typo reports are welcome. 6. No mud (26 students)...
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