Changes between Version 43 and Version 44 of WikiStart


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Timestamp:
Sep 15, 2017, 1:55:58 PM (3 years ago)
Author:
steiger5na
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  • WikiStart

    v43 v44  
    302302'''Experiment EXP10'''
    303303
    304 The flow rate is increased, there are again a lot of bubbles. The beginning of the "jet" took less than 1minute to reach the 1st corner.
     304The flow rate is increased, there are again a lot of bubbles.
     305
     306Time to reach the first corner: less than 1minute.
    305307
    306308After the reaching the first corner a major part of the flow followed the boundary and circulated on the shelf.
     
    310312'''Experiment EXP11'''
    311313
    312 The water level is increased of 10 centimeters compared to the previous experiment. With the higher water level, we need to calculate new flow rates with the ration of the outflow area before and after the higher water level. Now, we are aiming to a flow rate of 33 l/min, which corresponds to the 20 l/min for the lower water level.
     314The water level is increased by 10 centimeters to 68.5 cm. With the higher water level, we need to calculate new flow rates with the ration of the outflow area before and after the higher water level. Now, we are aiming to a flow rate of 33 l/min, which corresponds to the 20 l/min for the lower water level.
     315
     316Conversion of flow rate from low to high water level:
    313317
    314318||Q (low water level)||Q (high water level)||
    315 ||10||||
     319||10||17||
    316320||20||33||
    317 ||35||||
    318 ||50||||
    319 ||80||||
     321||35||58||
     322||50||83||
     323||80||133||
     324
     325Note: In the previous experiment, the measured flow rate was always  higher than the expected one with their diaphragme - flowrate curve. We  plotted the diaphrame vs. flowrate again with the values from our  experiments. For the flowrate of Q = 33 l/min, we therefore used a  diaphragme with  diameter of 10 mm, instead of 8.6 mm (which it was for  the 20 l/min flux  before).[[BR]]We measured the flux 4 times during this experiment. It gave:[[BR]]- 32.4 l/min[[BR]]- 34.5 l/min[[BR]]- 33.3 l/min[[BR]]- 34.9 l/min
     326
     327Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography.
     328
     329Time to reach the first corner: 3 min.
    320330
    321331Observations: There are no more bubbles. The flow crossed the shelfbreak between the 1st and the 2nd corner. After the flow is established it follows along the rough topography and returns along the continental coast.
     
    325335There were very few particles in the end of the horizontal slice. On the vertical slice the flow does not look barotropic.
    326336
    327 Note: In the previous experiment, the measured flow rate was always higher than the expected one with their diaphragme - flowrate curve. We plotted the diaphrame vs. flowrate again with the values from our experiments. For the flowrate of Q = 33 l/min, we therefore used a diaphragme with  diameter of 10 mm, instead of 8.6 mm (which it was for the 20 l/min flux  before).[[BR]]We measured the flux 4 times during this experiment. It gave:[[BR]]- 32.4 l/min[[BR]]- 34.5 l/min[[BR]]- 33.3 l/min[[BR]]- 34.9 l/min
    328 
    329 Note: After Exp11 they realized that there was water in the laser, they had to go and move it up.
    330 
    331 New measured water level: 72.7cm at the edge and 68.5cm over the topography.
     337Note: After Exp11 they realized that there was water in the laser, they had to go and move it up.
    332338
    333339'''Experiment EXP12'''
    334340
    335 This experiment was still without the corner and a water level of 68,5 cm.
    336 
    337 7.7 Friday
    338 
    339  ''6 - Table of Experiments: ''
     341This experiment was the same as EXP11 with a water level of 68.5 cm but with the corner. The expected flowrate was 33 l/min and the measured flowrate was 34.6 l/min. 
     342
     343The exposure time was increased to 40 ms, because the flow is slow - so no need to have a short exposure time. It makes the particles more visible.
     344
     345== 7.7 Friday 15 September ==
     346=== Experiment 1''3'' ===
     347During night, we increased the rotation rate to get a rotation period of 30s! We kept the corners.
     348
     349There were still many particles in the ambient water, but Thomas sprayed more particles on the surface.
     350
     351New measured water levels: [[BR]]- wall: 69.8 cm[[BR]]- center: 59.5 cm[[BR]]- invariant: 65 cm
     352
     353Water level on the screen: 63.4 cm
     354
     355For the desired fluxrate of 50 l/min, we used the diaphragme with 12.6 mm diameter. The measured fluxrate after the experiment was 54.5 l/min.
     356
     357Observations: In the beginning of the experiment, there were too many particles in the influx, but got less with time. The main current turned left at the second corner into the trough.
     358
     359Note: The source is leaking, which created bubbles and a little "waterfall"
     360
     361  ''''
     362  ''6 - Table of Experiments: ''
    340363
    341364 * will be updated from Excel sheet!