presentation(velocity profile in square duct)
TRANSCRIPT
Measurement of Velocity Profile in a Square Duct
ME 400
Jafar Samarah
Motasem Abu Shanap
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.
Introduction
Viscous flow Laminar, Transition and Turbulent flow Reynolds Number Hydraulic diameter Entrance length
Principles
Viscosity is a measure of the resistance of a fluid which is being deformed by shear stress.
Dynamic viscosity. Kinematic viscosity .
Viscous Flow
Laminar Flow, Re<2300. Transition Flow, 2300<Re<4000. Turbulent Flow, Re>4000.
Flow Regimes
Reynolds Number
Hydraulic Diameter
It is the length required to reach the fully developed flow.
Entrance Length
Conservation of Mass Conservation of Momentum Navier stokes equation Euler's Equation Bernoulli's equation
Governing Equations
Conservation of Mass
Navier Stokes Equation
Euler's Equation
Bernoulli's Equation
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.
Experimental Setup
Experimental Setup
Experimental Results
We Obtained The Velocity Profiles at The Locations Shown in The Figures
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 ⊽.
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.
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 ⊽.
Figure 4.6 shows the velocity profile for the duct channel along x-axis with variation 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.
Figure 4.7,Comparing the results at x=180 cm, for y & z
axis
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.
Conclusion
?Questions