Heterogeneous nucleation of bubbles on an advancing solidification front during freezing of water containing a dissolved gas has been experimentally and analytically studied. The formation of bubbles resulting from supersaturation of liquids is commonly encountered in different fields such as heat transfer, manufacturing, and bioscience.
In this work, sizes of nucleating bubbles and concentration profiles of dissolved oxygen and carbon dioxide gases in water ahead of the solidification front have been measured. From successful comparisons between the measured and predicted critical radii of nucleating bubbles and distributions of dissolved gas content, phenomena of heterogeneous nucleation in a binary weak solution during the freezing process are quantitatively confirmed.
The results show that an increase in gas content at the solidification front in the liquid decreases the free energy barrier and critical radii of bubbles that are formed on the solidification front. In the early stage of solidification, sizes of the critical radii decrease and the number of nucleating bubbles increase. As solidification rates decrease later, content of the dissolved gas in the liquid on the advancing interface decreases and the critical radii of nucleating bubbles increase.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0704103-094139 |
| Date | 04 July 2003 |
| Creators | Huang, Chang-Chen |
| Contributors | F.B Hsiao, Jiin-Yuh Jang, Peng-Sheng Wei, Han-Taw Chen |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704103-094139 |
| Rights | unrestricted, Copyright information available at source archive |
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