Helium bubble generator SAI Model 5

The generator is a compact and unique device for visualization of complex flow structures produced by SAGE Action Inc. It generates monodisperse neutrally buoyant, helium-filled bubbles of a diameter ranging from 0.8 to 4.5 mm. The bubbles follow complex air flow patterns without the risk of bubble burst or attachment to an object inserted into the flow. The system is widely applicable to all engineering issues where air flow is of interest.


  • number of bubbles generated: 300 – 400 bubbles/sec and head
  • bubble diameter: 0.8 – 4.5 mm
  • bubble life: 1 – 2 minutes
  • minimal spatial resolution: 0.64 – 1.9 mm
  • recommended bubble film solution: SAI™ 1035 BFS


Typical applications

  • flow visualization in fluid dynamics, experimental research into gaseous flow
  • bubbles are suitable as seeding/tracer particles for optical measuring methods such as PIV, PTV, LDA particularly for observation of large areas
  • internal and external aerodynamics, studies of flow around bodies in wind tunnels
  • research into heating, ventilation and air-conditioning in rooms, assessment of indoor climate of vehicles
  • investigation of air/gas discharge flow from ventilation outlets, tubes and nozzles
  • studies on gas jet mixing
  • particle tracking, streamlines and vortex structures


Contact person

Jan Jedelsky, Ph.D., Associate Professor
phone: +420 54114 3266 | e-mail: jedelsky@fme_vutbr_cz

Energy Institute, Department of Thermodynamics and Environmental Engineering
Faculty of Mechanical Engineering, Brno University of Technology
Technicka 2896/2, 616 69 Brno, Czech Republic

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