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Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures
| Title: | Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures |
| Authors: | Sakashita, Hiroto Browse this author | | Ono, Ayako Browse this author | | Nakabayashi, Yuta Browse this author |
| Keywords: | Critical heat flux | | Binary mixtures | | Pool boiling | | Conductance probe | | Macrolayer |
| Issue Date: | Mar-2010 |
| Publisher: | Elsevier |
| Journal Title: | International Journal of Heat and Mass Transfer |
| Volume: | 53 |
| Issue: | 7-8 |
| Start Page: | 1554 |
| End Page: | 1562 |
| Publisher DOI: | 10.1016/j.ijheatmasstransfer.2009.11.028 |
| Abstract: | Saturated pool boiling of 2-propanol/water mixtures on a 12 mm diameter horizontal disk under atmospheric pressure was investigated. The CHF of the mixtures increased up to 1.7 times the CHF of water at 3.0-4.7 mol% concentrations of 2-propanol. To examine the mechanism of the CHF enhancement in the mixtures, liquid-vapor structures close to the heating surface were measured using a conductance probe. It was found that in the boiling of the mixtures, liquid-vapor structures show strong non-uniformity in the radial direction of the heating surface. The void fractions at 0.1mm to 1mm above the heating surface are small at the central region and large near the periphery of the heating surface. The liquid layer between the vapor mass and the heating surface is considerably thicker than that of water at the central region and becomes thinner near the periphery of the heating surface. This thicker liquid layer is likely to be the cause of the CHF enhancement in the 2-propanol/water mixtures. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/42767 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 坂下 弘人
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