Lecture Demonstrations Laboratory

The Demonstrations Manual

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Surface Tension
Fluid Statics
Fluid Dynamics: Torricelli's Law; Air Driven Devices; Venturi Tube and Qualitative Verification of Bernouilli's Equation; Toilet paper gun; Airplane Wing in Wind Tunnel; Air Flow Dynamics; Terminal Velocity in Glycerin and Water; Terminal Velocity of Coffee Filters; Laminar and Turbulent Flow; Tornado Vortex; Vortex Cannon

Venturi Tube and Qualitative Verification of Bernouilli's Equation

Purpose:

To demonstrate operation of a venturi tube and to verify variation of gas velocity with area of tube.

Procedure:

Connect the hose to the compressed air source and show different pressures in flow tube by flowing air through system and noting pressure relationships by the level of colored liquid in the tubes.

Hints:

We have an alternative setup with only 3 tubes available. It might be a little bit trying for the room 203 but the advantage is that the flow velocity could be controlled with the pump.

Note: the large cros section pipes after the narrowing almost never show the same level as the first large pipe most likely due to the formation of the turbulence (continuity equation does not hold for turbulent flow)

Comments:

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Equipment:

Compressed Air Source
Venturi Tube