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. Introduction∗ Aim of the experiments is to obtain the velocity profile in square duct at different location along x- axis.∗ Velocity Profile Measuring Devices.∗ Pressure Measuring Devices.∗ Pitot Static Tube.∗ Pressure Transducers.
  3. 3. Principles∗ Viscous flow∗ Laminar, Transition and Turbulent flow∗ Reynolds Number∗ Hydraulic diameter∗ Entrance length
  4. 4. Viscous Flow∗ Viscosity is a measure of the resistance of a fluid which is being deformed by shear stress.∗ Dynamic viscosity.∗ Kinematic viscosity .
  5. 5. Flow Regimes∗ Laminar Flow, Re<2300.∗ Transition Flow, 2300<Re<4000.∗ Turbulent Flow, Re>4000.
  6. 6. Reynolds Number
  7. 7. Hydraulic Diameter
  8. 8. Entrance Length∗ It is the length required to reach the fully developed flow.
  9. 9. Governing Equations∗ Conservation of Mass∗ Conservation of Momentum∗ Navier stokes equation∗ Eulers Equation∗ Bernoullis equation
  10. 10. Conservation of Mass
  11. 11. Navier Stokes Equation
  12. 12. Eulers Equation
  13. 13. Bernoullis Equation
  14. 14. Experimental Setup∗ Square 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 ⊽.
  18. 18. In figure 4.4, velocity profile Over y-Axis With Fixed Height z=0 cm, along x- Axis without straws. Normalized by dividing each velocity by the mean one, ⊽/Vm.
  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 ⊽.
  20. 20. Figure 4.6 shows the velocity profile for the duct channel along x-axis withvariation of z-axis, without straws and fixed height y=0cm. it is normalized by dividing the velocity of each location by the mean velocity ⊽/Vm.
  21. 21. Figure 4.7,Comparing the results at x=180 cm, for y & z axis
  22. 22. Conclusion∗ Vibration 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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