Science Mile Q3 | Schlieren method for the visualization of room air flows
© Lia Becher
© Lia Becher
© Lia Becher
Project information
submitted by
Lia Becher
Co-Authors
Amayu Wakoya Gena
Mentors
Conrad Völker
Faculty:
Civil and Environmental Engineering
Degree programme:
Civil Engineering (Master of Science (M.Sc.))
Type of project presentation
Research project
Semester
Summer semester 2023
- Coudraystraße 13B
(Raum 110 - Schlierenlabor)
Project description
The optical schlieren and background oriented schlieren (BOS) methods can be used to visualize indoor air flows over large areas. Both methods are based on the physical principle of light deflection, which the light rays experience as soon as they enter a medium with a different density. In order to visualize these density gradients two-dimensionally with the Schlieren method, a Schlier mirror with astronomical qualities is used at the Chair of Building Physics, the diameter of which is 1m. In contrast to the schlieren method, the BOS method can also record the density differences 2.5-dimensionally or three-dimensionally with several cameras. In this case, the BOS uses an irregular background pattern to visualize the air flows, which is virtually distorted due to the light beams deflected at the density gradient. Furthermore, here the measurement range is theoretically spatially unlimited. Both methods use a high-resolution camera to record the air flows.