1) This rectangular duct is followed by a circular duct of 140 mm diameter in which there are both orifice and venturi meters. The orifice plate hole diameter is 108 mm and the pressure drop between the upstream tapping and the throat (the hole) is 216 Pa. The venturi throat diameter is 89 mm and the upstream-throat pressure drop is 177 Pa. Given discharge coefficients of 0.61 for the orifice plate and 0.98 for the venturi meter,

(b) This rectangular duct is followed by a circular duct of 140 mm diameter in which there are both orifice and venturi meters. The orifice plate hole diameter is 108 mm and the pressure drop between the upstream tapping and the throat (the hole) is 216 Pa. The venturi throat diameter is 89 mm and the upstream-throat pressure drop is 177 Pa. Given discharge coefficients of 0.61 for the orifice plate and 0.98 for the venturi meter, calculate the flowrate as measured by each of these meters (C & R p243 ~). Note: Useful information is included at the end of these briefing notes.

Table 1: Pressure differences recorded by the digital pressure meter in Pa) in each section of the Pitot tube traverse for the air flow experiment. 75 100 125 100 100 125 150 125 75 150 175 100 50 75 125 75 Each rectangle in the grid above represents an equal area. The density of water (the manometer fluid) is 1000 kg m*(C & Rp232~; note C & R="Coulson and Richardson"). Table 1: Pressure differences recorded by the digital pressure meter in Pa) in each section of the Pitot tube traverse for the air flow experiment. 75 100 125 100 100 125 150 125 75 150 175 100 50 75 125 75 Each rectangle in the grid above represents an equal area. The density of water (the manometer fluid) is 1000 kg m*(C & Rp232~; note C & R="Coulson and Richardson")