engineering recuitment Vizag Steel MT Mechanical 2020 Test Series 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
\({D_h} = \frac{{4ab}}{{a + b}}\)