CHE 215 - Gas pressure loss and venturi flowmeter lab report

Experimental Data and Result Sheet Experiment 9 Gas pressure loss and venturi flowmeter Flow Scale- Reading FLOWRATE (ft3/s) Pressure loss (in W.C, inch of water column) Flow system (pipe, orifice, or venture) 100 0.0317 78.45 95 0.0283 71.54 92 0.0267 64.81 90 0.0257 55.29 85 0.0217 35.37 82 0.02 30.99 80 0.0133 18.76 1266825177800 Air temperature 25oC 1 atm = (33.9 x 12) inches of water column (in WC) Calculations: Calculate the Reynolds number of each flow setting. (Pipe I.D. = 0.6 in) Conversions: Density of the air (?) = 1.1839 kg/m3 95249928194000The density of the fluid was converted to U.S customary unit: 23050491079500 1.1839 kg 2.20462 lbm 1 m3 m3 kg 35.3147 ft3 ? air = 0.0739 lbm/ft3 Fluid Viscosity 857250283210Conversions of Air Viscosity: 18.27 Pa.s 0.672 lbm ft s ? µ = 12.2774 lbm/ ft. s Diameter: Diameter of the Pipe =0.6 in. 166687529845000 1 ft= 12 in ? D Pipe = 0.6 in 1ft 12 in = 0.05 ft Volumetric flow rate: The volumetric flow rate for seven trials for the air in pipe was calculated as shown below: 1.9 ft3 60 min 1hr min 1hr 3600s ? Q= 0.0317 ft3/s Calculation of the Re number: Reynolds number for the pipe and orifice was calculated as shown for trial #1 below: Re pipe = 4 ? Q/ µ ? d = (4 * 0.0739 * 0.0317) / (12.2774 * ?* 0.05) = 0.00486 Table1. NRe of the Air in the Pipe Trial # Air Flow rate Q (ft3/s) Re Pipe Pressure Drops P (psia) 1. 0.0317 0.00486 2.835 2. 0.0283 0.00434 2.585 3. 0.0267 0.00409 2.342 4. 0.0257 0.00394 1.998 5. 0.0217 0.00333 1.278 6. 0.0200 0.00307 1.12 7. 0.0133 0.00204 0.678 Conversions of the Pressure loss of the air in the Pipe for trial #1: 2.835 psia 1atm (33.9x12in) 14.7psia 1atm ? P= 78.45 WC Table2. The Air Pressure loss in pipe Trial #1 Pressure loss in W.C 1 78.45 2 71.54 3 64.81 4 55.29 5 35.37 6 30.99 7 18.76 References: efunda “ Properties of Air “ http://www.efunda.com/materials/common_matl/show_gas.cfm 2013 A Graph of Pressure Loss and Re number the in Pipe