A pressure drop of 30 Pa is measured over a 60-m length of a 100 cm × 2 cm rectangular horizontal channel transporting 20°C air. What is the maximum flow rate? (rho=1.2 kg/m3, μ=1.81×10-5 N. S2/m)

Aseries piping system conveys methyl alcohol. the system consists of 70 m of 1- nominal pipe follow by 50 m of 2-nominal pipe, both schedule 40 commercial steel. the 1-nominal pipe contains 3 90° elbows (regular) anda fully open gate valve, all threaded. the pressure drop through the system is 150 kpa. determine the volume flow rate through the system that is horizontally laid.