Q$2$

$($a$)$ Briefly explain the different between pipe flow and open channel flow.

$(3$ marks$)$

$($b$)$ An experiment was conducted in the Fluid Mechanics Laboratory to determine the loss coefficient for $90-$degree elbow. The fluid flows upwards and time taken to fill $3-$liter beaker is $13\mathrm{.}86$ second. The different in elevation between inlet and outlet of the elbow is $40$ mm $.$ The diameter of the elbow is $22$ mm $.$ The height of the fluid in the manometer at the inlet and outlet of the elbow are $429mm,360mm$ respectively. If the density and kinematic viscosity of the water are $998k\frac{g}{m^3},1{10}^{-6}\frac{m^2}{s}$ respectively, determine the loss coefficient for $90-$degree elbow.

$(12$ marks$)$