Flow Visualization In Channels


In research and training, flow processes are often considered in simplified models, e.g., in pipe flows, open channel drainage processes or the incident flow of structures.

FM 100.23 can be used to visualize flow around bodies, pipe flows and flow phenomena in open channels. Various models are fixed in the flow section. The streamlines are made visible by using injected ink as a contrast medium. The flow section is illuminated from behind and has a transparent front plate.

Open-channel flow is demonstrated with two weirs. The downstream water level can be adjusted with the aid of another weir. Flow through is shown in three models with change in cross-section and in the model “pipe bundle”. Streamlines in flow around bodies are demonstrated on four drag bodies.

FM 100.23 includes a closed water circuit. Alternatively, the experimental unit can be operated by the laboratory supply.


  1. Experimental unit for visualization of various flow processes
  2. Illuminated flow section with transparent front panel
  3. Open-channel flow demonstrated on 2 weirs
  4. Flow through demonstrated with 4 differently shaped models
  5. Flow around solid bodies demonstrated on four drag bodies
  6. Contrast medium: ink
  7. Optional operation via laboratory supply or as closed water circuit

Technical Details

  1. Flow section: approx. 5L
  2. Contrast medium: ink
  3. Injection of the contrast medium 5 nozzles
  4. Pump flow rate: 10L/min head: 5,7m
  5. Weirs broad-crested sharp-crested
  6. Drag body 2-cylinder cross-sections aerofoil, symmetrical aerofoil, asymmetrical
  7. Change in cross-section / flow through gradual contraction / sudden enlargement sudden contraction / gradual enlargement sudden contraction / enlargement
  8. Tube bundle
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
  • UL/CSA optional
  • L x W x H: 1000x310x680mm
  • Weight: approx. 25kg