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Equipment

   

The Laboratory of Hydromechanics and Environmental Engineering is equipped with

1) PARTICLE IMAGE VELOCIMETER (PIV)

Manufactured by LaVision GmbH, Germany. With the following components:

i) Imager Pro X 2M CCD camera. Digital CCD κάμερα 12bit, resolution 1600 x 1200 pixel, pixel size 7.4μm x 7.4μm , 30 frames/sec, μνήμη 4GB

ii) Nd: YAG double-cavity laser. Παλμική πηγή laser 532nm διπλής ενέργειας, power 50mJ/pulse and frequeny up to 100Hz.

iii) Synchronization board. Programmable timing unit with δυνατότητα εσωτερικού ή εξωτερικού σκανδαλισμού (triger).

iv) DaVis Software licence. Import/Export features: BMP, JPG, TIF, TecPlot, DAT, TXT, PS. Built-in AVI Movie Generator. Διαχείριση μέχρι 64 Η/Υ. Standard interfaces (DLL) for Matlab, LabView.

v) System computer. 2 x 3GHz, 250GB harddisk, 1GBRAM, DVD-R/CD-R, MS Windows XP.

 
2) LASER DOPPLER ANEMOMETER (LDA)

Fiber optic Laser Doppler Anemometer with the following characteristics:

i) Measurement of one velocity component (can be upgraded to a two- velocity component)
ii) Laser beam (457-514.5nm) from an Argon - Ion 300mW air cooled laser vertically polarized with polarization ratio >1:100
iii) Fiberoptic cable connecting receiving and transmitting optics to the laser and signal analyzer
iv) Bragg-shift that enables directional velocity measurement
v) Photomultiplier tube for the best performance in low intensity signal
vi) Burst signal analyzer for Doppler frequencies up to 100MHz with software

 
3) TSI LDV/PDPA System (jointly owned with the Mechanical Engineering department).
 
4) A small wind-tunnel facility for the study of boundary layer development in a pipe inlet, head loss measurement, and the dispersion of an isothermal air jet, using Pitot-tube techniques.
 
5) An experimental apparatus for the measurement of friction and local losses in pressure pipe systems.
 
6) A 5m long flume with cross-section bXh = 0.10m X 0.275m. The bottom slope may vary from 0% to 2%.
 
7) A transparent Lucite tank with dimensions 1m X 0.60m, 0.80m deep, for dispersion studies in density stratified water bodies.
 
8) A tank with dimensions 0.80m X 0.80m, 1m deep made of tempered glass, for dispersion studies in buoyant (due to density or temperature variation) flows, using optical techniques.
 
9) A 12-bit, 100 kHz LabView-based data acquisition system with eight (8) differential or 16 single ended channels is also available.
 
10) The computational facilities of the laboratory include a 12-node beowulf cluster running under Linux. In addition, 2 SGI Unix workstations (an Origin 200 and an Octane) as well as 8 PCs are used for educational and research projects that require low to moderate computational power. A number of specialized computer programs are available for the simulation of internal, external and free-surface flows, water supply systems, groundwater, as well as for the development of GIS-based applications.
 
11) Regarding the environmental engineering section, the laboratory is equipped with instruments used for water quality monitoring, including BOD-meters, spectrophotometer, incubator, colorimeter, toxicity meters (using the Daphnia magna, algae or Microtox tests).
 
12) Portable Multimeter with electrodes for in situ measurement of water quality parameters (Temperature, Dissolved Oxygen, Conductivity, salinity, p H), Photometer with RFID technology, Special photochemical device equipped with UV light, Microtox Analyst, Multiple filtration device, Ingestion device, Centrifugal device, Water bath, Analytical yoke, Incubation cabinets, Thermal device, Automatic pipettes.
 
 
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