|Sep8-12, 09:01 PM||#1|
Nusselt Number dimension question
h is the heat transfer coefficient, and D is the diameter of the pipe in which heat transfer takes place...
..but what are the dimensions of k in terms of mass (M), length (L), time (T) and temperature ([itex]\theta[/itex])?
So far, I've worked out that the units for h are J/(m2 hr C), but I'm having difficulty expressing k in terms of what is given.
Am I wrong is thinking that J/(m2 hr C) can be expressed as W/(m2 K)? I'm thinking that this is relevant to the end units of k, but I am unsure if the dimensions are correct.
|Sep11-12, 10:43 PM||#2|
The Nussult number is dimensionless, so if you already know the units of h and D, then the units of k should be obvious: J/(m hr C)
|Sep11-12, 11:01 PM||#3|
We could do some major dimensional analysis with this to prove it, but I really don't feel like it. I'm guessing you've done the old pi theorem already though?
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