Cheetos
Mechanical
- Jul 27, 2007
- 56
I'm reading up on this article about heat sink calculation. Link
I'm confused about the Reynold's number equation. Eq 10.
It shows Re = (rho)(V)/(mu)(b)(b)/(L) b is the fin spacing and L is fin length.
The author treated hydraulic diameter, Dh, as b^2/L. I don't really understand why. I thought Dh = 4A/P. How did the length come into the equation? The author said it's the "modified channel Reynolds number"
I'm confused about the Reynold's number equation. Eq 10.
It shows Re = (rho)(V)/(mu)(b)(b)/(L) b is the fin spacing and L is fin length.
The author treated hydraulic diameter, Dh, as b^2/L. I don't really understand why. I thought Dh = 4A/P. How did the length come into the equation? The author said it's the "modified channel Reynolds number"