Changes between Version 35 and Version 36 of WikiStart


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Timestamp:
Sep 13, 2017, 11:26:53 AM (3 years ago)
Author:
steiger5na
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  • WikiStart

    v35 v36  
    1111
    1212=  =
     13=  =
    1314= ''6 - Table of Experiments: '' =
    1415=  =
     
    1617||||||||$(m)$||$(s)$||$(L min!^{-1})$||$(m)$||$(kg m!^{-3}$||$(mm)$||$H_1,H_2,\Delta t $||VS/HS/Scan||$cm$||$cm$||t1/t2/t3[[BR]]$\Delta t$||yes / no||||||
    1718||0||test||11092017 __[https://servforge.legi.grenoble-inp.fr/projects/pj-coriolis-17iceshelf/search?q=hh%3Amm hh:mm]__||0.604||50||58.5||0.50||0||13||170,150,41s||VS||-||-||?||yes||Dye did not show up in photos :-(||Elin||
    18 ||1||exp01||12092017[[BR]]!14:38||0.584||50||40.67||0.50||0||12.6||170,150,59s||HS,VS,Scan||55||55:-5:30,4||500ms[[BR]](reality: 1000ms)||no||Expl. time = 50 ms too little. Only every second photo was taken||Elin||
     19||1||exp01||12092017[[BR]]!14:38||0.584||50||40.67||0.50||0||12.6||170,150,59s||HS,VS,Scan||55||55:[-5:30,4 -5:30;4]||500ms[[BR]](reality: 1000ms)||no||Expl. time = 50 ms too little. Only every second photo was taken||Elin||
    1920||2||exp02||12092017[[BR]]!17:02||0.583||50||44.2||0.50||0||12.6||180,150,81.4s||HS||55?||-||200ms[[BR]](reality: 400ms)||no||Only every second photo was taken||Elin||
    20 ||3||exp03||13092017||||50||||0.50||0||12.6||||HS,Scan||||||200ms||no||Problem with photos fixed; particles in ambient||Elin||
     21||3||exp03||13092017||||50||50||0.50||0||12.6||||HS,Scan||||||200ms||no||Problem with photos fixed; particles in ambient||Elin||
     22||4||exp04||13092017||||50||||0.50||0||6.8||||HS,Scan||||||200ms||no||Laser started vibrating for the scans||Elin||
    2123
    2224=  =
     
    238240Observations: On the horizontal scans we can clearly see with our eyes that the particles are turbulent along the continental coast and don't flow straight along the continental slope. They turn left at the curvature and follow along the topography to the wall. Some particles turn right above the trough/ shelf and flow out to the slope again.
    239241
    240 Data check: We checked these first results with the PIV and decided to decrease the exposure time to 40 ms to get sharper images of the particles. With PCO2, the flow around the curvature can be captured with the PIV, but on PCO1 the PIV is not very good, because the flow is more turbulent and more 3 dimensional. We decide to decrease the time between the photos. '''Later we realized that the cameras only too every second photo, so with a time interval of 1000ms! '''
     242Data check: We checked these first results with the PIV and decided to decrease the exposure time to get sharper images of the particles. With PCO2, the flow around the curvature can be captured with the PIV, but on PCO1 the PIV is not very good, because the flow is more turbulent and more 3 dimensional. We decide to decrease the time between the photos. '''Later we realized that the cameras only took every second photo, so with a time interval of 1000ms! '''
    241243
    242244'''Experiment EXP02'''
     245
     246We repeated the HS with a reduced time to 200 ms between the photos and and exposure time of 30ms'''. We realized afterwards that the cameras only took every second photo, so with a time interval of 400ms! '''
     247
     248'''13 September'''
     249
     250The cameras are fixed now and taking every photo and the particles are spread out in the ambient water.[[BR]]So, we start the next experiments.
     251
     252'''Experiment EXP03'''
     253
     254The setup is still the same as for the previous experiments with 200ms time difference between the photos (this time working!) and particles in the ambient water. This time, we measured the flow rater AFTER the experiment and it was $Q = 50 l/min$, as expected. There are still bubbles coming out of the source!
     255
     256'''Experiment EXP04'''
     257
     258We started a new experiment at !10:25 with a reduced flow rate of about $Q = 20 l/min$ (diaphrama diameter of 6.8 mm). The first HS is run for 15 min now. We waited for 5 more minutes until the flow is more established until we start the scan.
     259
     260Note: During the scan, the laser is shaking too much! This needs to be changed.
     261
     262Observations: The bubble at the source disappeared due to the lower flow rate. The current follows along the slope and turns left at the 2nd curvature into the trough. After the 15 min after the flow was turned on, the flow bifurcates at the continental coast and at the trough and fills up the trough. The return flow does not follow along the upstream slope of the trough, but occurs in the middle of the trough. The main current along the slope is getting wider with time. [[BR]]''''''