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Heterogeneous Nucleation Induced by Capillary Wave During Acoustic Levitation |
| LÜ Yong-Jun;XIE Wen-Jun;WEI Bing-Bo
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| Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072 |
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| Cite this article: |
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LÜ, Yong-Jun, XIE Wen-Jun et al 2003 Chin. Phys. Lett. 20 1383-1386 |
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Abstract The rapid solidification of acoustically levitated drops of Pb-61.9 wt.%Sn eutectic alloy is accomplished. A surface morphology of spreading ripples is observed on a sample undercooled by 15 K. The ripples originate from the center of sample surface, which is also the heterogeneous nucleation site for eutectic growth. The Faraday instability excited by forced surface vibration has brought about these ripples. They are retained in the solidified sample if the sound pressure level exceeds the threshold pressure required for the appearance of capillary waves. Theoretical calculations indicate that both the pressure and displacement maxima exist in the central part of a levitated drop. The pressure near the sample center can promote heterogeneous nucleation, which is in agreement qualitatively with the experimental results.
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| Keywords:
81.30.Fb
43.25.Uv
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Published: 01 August 2003
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