Fluid Mechanics Laminar Flow Laminar Flow through Pipe

The hydraulic diameter, Dh of a rectangular duct with side ‘a’ and ‘b’ is

1
\( {D_h} = \frac{{4ab}}{{2a + b}}\)
2
\({D_h} = \frac{{2ab}}{{a + b}}\)
3
\({D_h} = \frac{{2ab}}{{2a + b}}\)
4
\({D_h} = \frac{{4ab}}{{a + b}}\)

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