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Document IIF

Study on distribution characteristics and regulation of trapped air bubbles in twodimensional droplets.

Numéro : 0030

Auteurs : GAO R., SONG M., SHAO K., LIANG Y., SHI H.

Résumé

Water droplet solidification is a common phase-change process encountered in numerous environmental and engineering applications. However, direct observation of transient internal solidification phenomena in conventional three-dimensional (3D) droplets remains challenging because of optical obstruction and interfacial curvature. In this study, a Hele-Shaw cell is employed to confine water droplets into a quasi-twodimensional (2D) geometry, allowing the internal freezing process and trapped-air-bubble evolution to be directly visualized under substrate temperatures ranging from -12 °C to -20 °C. The results show that the width, length, and volume of the trapped bubbles exhibit an approximately bell-shaped variation along the droplet height. As the substrate temperature decreases from -12 °C to -20 °C, the average bubble width, length, and individual volume decrease by 45.7%, 41.6%, and 78.2%, respectively. In addition, the bubble width decreases with increasing local freezing-front rate and follows an approximately inverse square-root scaling. These findings reveal a close coupling between freezing-front propagation and bubble entrapment during confined droplet solidification and provide useful insight into internal freezing processes that are difficult to resolve in conventional 3D droplets.

Documents disponibles

Format PDF

Pages : 8 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Study on distribution characteristics and regulation of trapped air bubbles in twodimensional droplets.
  • Identifiant de la fiche : 30035377
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 15th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings:  Xi'an China, September 16-18, 2026.
  • Date d'édition : 09/2026
  • DOI : http://dx.doi.org/10.18462/iir.pcm.2026.0030

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