It is possible to see flow structures resembling large vortices with dimensions comparable with the channel cross-section above the ventricular folds. The vortices disappear in the narrowest epilaryngeal part of the vocal tract where the flow is uniform. Considerable 3D effects of the glottal flow were observed in the vocal tract near the vibrating vocal folds, especially for higher airflow rates. Large eddies of a size comparable with the channel height were observed in the model of the mouth cavity where the airflow was attached to one wall of the channel resembling a Coanda effect [10]. Acknowledgement The research is supported by the Grant Agency of the Czech Republic by project No 101/08/115.
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