Analyzing air flow through Sqaure duct

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Analyzing air flow through Sqaure duct

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Analyzing air flow through Sqaure duct

  1. 1. Measurement of VelocityProfile in a Square Duct ME 400 Jafar Samarah Motasem Abu Shanap
  2. 2. IntroductionAim of the experiments is to obtain the velocityprofile in square duct at different location along x-axis.Velocity Profile Measuring Devices.Pressure Measuring Devices.Pitot Static Tube.Pressure Transducers.
  3. 3. PrinciplesViscous flowLaminar, Transition and Turbulent flowReynolds NumberHydraulic diameterEntrance length
  4. 4. Viscous FlowViscosity is a measure of the resistance of a fluidwhich is being deformed by shear stress.Dynamic viscosity.Kinematic viscosity .
  5. 5. Flow RegimesLaminar Flow, Re<2300.Transition Flow, 2300<Re<4000.Turbulent Flow, Re>4000.
  6. 6. Reynolds Number
  7. 7. Hydraulic Diameter
  8. 8. Entrance LengthIt is the length required to reach the fully developedflow.
  9. 9. Governing EquationsConservation of MassConservation of MomentumNavier stokes equationEulers EquationBernoullis equation
  10. 10. Conservation of Mass
  11. 11. Navier Stokes Equation
  12. 12. Eulers Equation
  13. 13. Bernoullis Equation
  14. 14. Experimental SetupSquare Cross Section (20X20cm) and 2 m long duct.Fan.Glass piece on the side of the duct.Nozzle.Pitot Static Device.Signal Reading Device with Pressure Transducers.Straighteners.
  15. 15. Experimental Setup
  16. 16. Experimental ResultsWe Obtained The Velocity Profiles at The Locations Shown in The Figures
  17. 17. Figure 4.3 shows the velocity profile for the duct channel along x-axis with variation of y-axis, without straws at fixed z=0 cm. For each location we took 5 readings of velocity, and then we took the average velocity ⊽. ⊽ [m/s] m/s cm,Vm= m/s cm,Vm= m/s cm,Vm= m/s cm,Vm= y-axis (cm)
  18. 18. ⊽/ _ 200cm,Vm=5.479m/s 190cm,Vm=5.333m/s 160cm,Vm=5.453m/s 140cm,Vm=5.529m/s /( _ )
  19. 19. Figure 4.5 shows the velocity profile for the duct channel along x-axis with variation of z-axis, without straws and fixed height y=0cm. For each location we took 5 readings of velocity, and then we took the average ⊽. ⊽ [m/s] m/s cm,Vm= x= m/s cm,Vm= x= m/s cm,Vm= x= z-axis (cm)
  20. 20. ⊽/ _ m/s cm,Vm= x= m/s cm,Vm= x= m/s cm,Vm= x= /( _ )
  21. 21. Figure 4.7,Comparing the results at x=180 cm, for y & z axis ⊽[m/s] cm, z axis x= cm,y axis x= z axis (cm) y axis (cm)
  22. 22. ConclusionVibration of the duct due to the fan rotation.Irregularity of the duct shape.Extra friction due to the flange connection.Eccentricity of the fan eye.Vibration of Pitot static tube due to the air flow.The Frame of the glass which gives extra friction.
  23. 23. Questions

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