Air flows through a round duct section with a diverging, round to round, transition (see Fig. 11.3b) at the rate of 0.5 m3 s í1 . The angle of divergence, ș =300 . The lengths and diameters of the...

Air flows through a round duct section with a diverging, round to round, transition (see Fig. 11.3b) at the rate of 0.5 m3 s í1 . The angle of divergence, ș =300 . The lengths and diameters of the duct sections upstream and downstream of the transition are 5 m, 0.25 m and 15 m, 0.35 m respectively. The upstream section includes two 90° bends (see Fig. 11.3a). Assume the friction factor for the straight duct sections as 0.02. Calculate (i) the change in velocity pressure and the total pressure loss across the transition, (ii) the total pressure loss from the entrance to the exit of the duct.