Instrumentation & Automation
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# Venturi Nozzle - Gas Mixtures

Example Of Gas Flowrate
Flowrate - Mass
Calculation of the flowrate [q] for a given differential pressure [Δp].
1. Input values
 Calculated values Symbol Unit Value Device diameter at 20 °C d20 mm 84,000 Pipe diameter at 20 ° D20 mm 160,000 Device material steel AISI 321, S32100 Pipe material steel 1030, 1034, 1035, 1038 Arithmetical mean deviation of the roughness profile (Steel new, seamless hot drawn) Ra mm 0,0300 Uniform equivalent roughness Rk mm 0,1000 Operating temperature t °С 0,00 Atmospheric pressure pa kPa 101,33 Upstream pressure pu kPa 1200,00 Differential pressure Δp kPa 16,00 Operating conditions Dynamic viscosity μ μPa·s 17,3580 Density, standard conditions ρs kg/m³ 1,2050 Compressibility factor K - 0,99350 Adiabatic index k - 1,40700

2. Calculation of intermediate values
 Calculated values Symbol Unit Value Absolute pressure p kPa 1301,33 Thermodynamic temperature T °K 273,15 The temperature coefficient of change in the diameter of the device, caused by temperature deviations from 20 °C Kd - 1,000000 Device diameter at operating temperature d mm 84,0000 The temperature coefficient of change in the diameter of the pipe, caused by temperature deviations from 20 °C Kp - 1,000000 Pipe diameter at operating temperature D mm 160,0000 Diameter ratio β - 0,525000 Input rate factor E - 1,04030 Density, operating conditions ρ kg/m³ 16,7177 Expansibility factor ε - 0,99271

3. Final calculations
 Calculated values Symbol Unit Value 1-st approximation Reynolds number Re - 1000000 Discharge coefficient C - 0,975011 The roughness coefficient of the internal surface of the pipe Kr - 1,00082 Mass flowrate qm kg/s 4,08469 2-nd approximation Reynolds number Re - 1872618 Discharge coefficient C - 0,975011 The roughness coefficient of the internal surface of the pipe Kr - 1,00082 Mass flowrate qm kg/s 4,08469 Deviation Δ % 0,0000000