Title: Dataset for Ultra-High-Speed Visualization of Droplet Impact Regimes on a Spherical Baffle of a Jet Nebulizer
Authors: Henrik Schmitz, Wilko Rohlfs, Manuel Reddemann

Contact: info@wsa.rwth-aachen.de 

WSA Institute of Heat and Mass Transfer
RWTH Aachen University
Augustinerbach 6
52056 Aachen

This data was used in the article 'ULTRA-HIGH-SPEED VISUALIZATION OF DROPLET IMPACT REGIMES ON A SPHERICAL BAFFLE OF A JET NEBULIZER'
doi: https://doi.org/10.1615/AtomizSpr.2026063093

Keywords: Jet Nebulizer, High-Speed-Visualization, Spray-Wall-Interaction, Splashing, Aerosol

The files contain experimental data. The experimental set-up and metadata is described for each method below (more details are provided in the corresponding paper):

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Ultra-high-speed Microscopy:

This dataset contains ultra-high-speed microscopy videos capturing the primary atomization and droplet-baffle impaction phenomena of a nebulizer.

IMAGING HARDWARE & ILLUMINATION
    Camera: Kirana 5M ultra-high-speed camera (Specialized Imaging).
    Resolution & Limits: 924 x 768 pixels, limited to a maximum sequence of 180 frames per recording.
    Illumination: SILUX640 laser (640 nm wavelength, 20 ns pulse duration) expanded to a 25 mm beam.
    Setup: The laser illumination was positioned directly opposite to the camera, creating a shadowgraphy setup  to visualize the liquid structures as dark silhouettes    against a bright background.

RECORDING PARAMETERS
    Frame Rate: 5,000,000 frames per second (5 Mfps).
    Duration: At 5 Mfps, the 180-frame limit results in a total capture time of 36 microseconds per video.
    Timing: All recordings were triggered 5 seconds after gas flow initiation to guarantee steady-state operation.

OPTICAL CONFIGURATIONS
Depending on the video, one of two optical setups was used:
    Overview Setup: K2-CF4 long-range microscope objective. Yields a spatial resolution of 4.3 um/pixel and a Field of View (FOV) of roughly 3.97 x 3.30 mm.
    High-Resolution Setup: Mitutoyo MPlan APO 50x objective with a custom lens tube. Yields a spatial resolution of 1.0 um/pixel and a FOV of 0.92 x 0.77 mm at a 13 mm     working distance (protected by a shielding airflow).
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File list:
- 'README.txt' (this file)
- 'Video01': Free Spray (Configuration A)
- 'Video02': Atomization region on the baffle (Configuration B), global overview
- 'Video03': Droplet Splashing on baffle center
- 'Video04': Oblique Splash in FOV with center 0.8 mm from symmetry axis
- 'Video05': Detail View of Crown formation in baffle center
- 'Video06': Detail View of Splash in center region of baffle
- 'Video07': Detail view of Oblique drop impact in FOV 0.8 mm from symmetry axis
- 'Video08': Bag Breakup observed in FOV 0.8 mm from symmetry axis