Procedure_Flow_Visualization_Boundary_Layers_Wakes

Procedure_Flow_Visualization_Boundary_Layers_Wakes - Lab 1:...

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Lab 1: Flow Visualization, Boundary Layers and Wakes Procedure 1. Calibrate the water tunnel, that is, measure the speed of the water versus the setting of the speed controller in Hz. a) The speed of the water flow can be measured using the hydrogen bubble wire. First set the speed controller to 60 Hz. Turn on the web cam using Astra Image. Turn the bubble wire on. Note how the bubbles grow in size as contaminants build up on the wire. What happens to the larger bubbles? Why? The bubble wire can be ‘cleaned’ by reversing the polarity on the generator box for 10 seconds. Switch the bubble wire to pulsed mode and study the effects of varying the width and period controls. Adjust the pulse rate and pulse width on the hydrogen bubble wire to get several cycles of bubbles in the webcam image. b) Measure the pulse rate by counting the number of pulses over some time measured with the stop watch. Make sure you get an average over at least a minute . You also need a calibration of the webcam scale, which you can get by placing a scale in the water at the position of the hydrogen bubble wire and capturing an image. c)
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Procedure_Flow_Visualization_Boundary_Layers_Wakes - Lab 1:...

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