Recent content by Ron_H

“The paper I linked in post #8, discusses the dependence of lift on viscosity, in section 6.“ Got it! Wonderful! Thanks very much for your patience.

Thanks for the link. I didn’t know about the paradox. I think it was a given (not my assumption) that this fluid is inviscid. So the article says that there is no *drag* in our problem. But it does not say that there is no lift. Picturing a ceiling fan with non-zero pitch, I still see fluid...

I'm assuming you are correct. But I can't track with you. Here's where I am: The blades have an angle of attack. So there seems to be no way to rotate the fan without accelerating the fluid. That tells me it takes torque to turn the fan. Where did I go wrong?

So let’s say that there is no lift without viscosity. Does that imply no fan can move the fluid? Think about the questions I asked before.

So can you rotate the fan? If so: What happens when you rotate the fan? Does it require torque to rotate the fan? What does this fluid do when you rotate the fan?

Hi Charles Link, I've been thinking about your posts. What was your thought process? How do you know you are right? You say And you also say In setting up my question, I'm going to re-write these statements. Please correct me if I've misunderstood you. The statement of the problem...

Hi Charles Link, Thanks!

Thank you Orodruin and Charles Link, Orodruin, the book I took the problem from (Halliday & Resnick, 1966) says, in this context, They are using ##\mu## for the number of moles. This gives Cv dimensions ML2T-3 or as you say 'energy per temp per quantity of substance amount'. So, I could not...

I don't see how isolate m or M. That is, how to get rid of <v^2> which is how I wrote the average of v2