Measurement of VelocityProfile in a Square Duct ME 400 Jafar Samarah Motasem Abu Shanap
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.
PrinciplesViscous flowLaminar, Transition and Turbulent flowReynolds NumberHydraulic diameterEntrance length
Viscous FlowViscosity is a measure of the resistance of a fluidwhich is being deformed by shear stress.Dynamic viscosity.Kinematic viscosity .
Experimental ResultsWe 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 ⊽. ⊽ [m/s] m/s cm,Vm= m/s cm,Vm= m/s cm,Vm= m/s cm,Vm= y-axis (cm)
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)
⊽/ _ m/s cm,Vm= x= m/s cm,Vm= x= m/s cm,Vm= x= /( _ )
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)
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.