Changes between Version 43 and Version 44 of WikiStart

Timestamp:

Sep 15, 2017, 1:55:58 PM (7 years ago)

Author:

steiger5na

Comment:

--

WikiStart

@@ -302 +302 @@
 '''Experiment EXP10'''
 
-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.
+The flow rate is increased, there are again a lot of bubbles. 
+
+Time to reach the first corner: less than 1minute.
 
 After the reaching the first corner a major part of the flow followed the boundary and circulated on the shelf.
@@ -310 +312 @@
 '''Experiment EXP11'''
 
-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. 
+The 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. 
+
+Conversion of flow rate from low to high water level:
 
 ||Q (low water level)||Q (high water level)||
-||10||||
+||10||17||
 ||20||33||
-||35||||
-||50||||
-||80||||
+||35||58||
+||50||83||
+||80||133||
+
+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
+
+Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography. 
+
+Time to reach the first corner: 3 min.
 
 Observations: 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.
@@ -325 +335 @@
 There were very few particles in the end of the horizontal slice. On the vertical slice the flow does not look barotropic.
 
-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
-
-Note: After Exp11 they realized that there was water in the laser, they had to go and move it up. 
-
-New measured water level: 72.7cm at the edge and 68.5cm over the topography. 
+Note: After Exp11 they realized that there was water in the laser, they had to go and move it up.
 
 '''Experiment EXP12'''
 
-This experiment was still without the corner and a water level of 68,5 cm. 
-
-7.7 Friday 
-
- ''6 - Table of Experiments: ''
+This 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.  
+
+The 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.
+
+== 7.7 Friday 15 September ==
+=== Experiment 1''3'' ===
+During night, we increased the rotation rate to get a rotation period of 30s! We kept the corners.
+
+There were still many particles in the ambient water, but Thomas sprayed more particles on the surface.
+
+New measured water levels: [[BR]]- wall: 69.8 cm[[BR]]- center: 59.5 cm[[BR]]- invariant: 65 cm
+
+Water level on the screen: 63.4 cm
+
+For 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.
+
+Observations: 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. 
+
+Note: The source is leaking, which created bubbles and a little "waterfall"
+
+  ''''
+  ''6 - Table of Experiments: ''
 
  * will be updated from Excel sheet!