18 Air flows upward through an inclined 6-cm- diameter pipe with the inclination angle of 0 = 30 at a volume flow rate of Q. The pipe diameter is then reduced gradually to 4 cm using a reducer as sketched. The pressure change across the reducer is measured by a water manometer as h = 12.5 cm when the distance between measurement points is L = 30 cm. a. Assuming an inviscid steady flow, determine the volume and mass flow rates of air in the pipe (Pwater = 1000 kg/m and Patr = 1.26 kg/m). b. For the same volume flow rate computed in part (a), will the manometer reading h be higher or lower when the viscous effects are taken into account? Explain why? Air h