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arXiv physics/0504056physics.flu-dyn
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表面冻结液体中的Faraday不稳定性

Faraday Instability in a Surface-Frozen Liquid

Patrick Huber, Viktor Soprunyuk, Jan Embs, Christian Wagner, Moshe Deutsch, Satish Kumar

摘要:

用法拉第表面不稳定性方法测量了二十四烷醇(C_24H_50)熔体的驻波临界加速度a_c和波数k_c,结果表明,在高于体相凝固温度T_s= 54 ℃时,驻波的临界加速度a_c和波数k_c发生突变。用流体动力学模型定量地解释了a_c和k_c随温度和驱动频率的变化,揭示了从自由液面的自由滑移流动(T>T_s)到固体湿壁附近的表面钉扎无滑移流动(T < T_s)的变化。在Ts处的变化被追踪到表面冻结的开始,其中在表面钉扎流中的陡峭的速度梯度显著地增加了表面附近的粘性耗散。

英文摘要:

Faraday surface instability measurements of the critical acceleration, a_c, and wavenumber, k_c, for standing surface waves on a tetracosanol (C_24H_50) melt exhibit abrupt changes at T_s=54degC above the bulk freezing temperature. The measured variations of a_c and k_c vs. temperature and driving frequency are accounted for quantitatively by a hydrodynamic model, revealing a change from a free-slip surface flow, generic for a free liquid surface (T>T_s), to a surface-pinned, no-slip flow, characteristic of a flow near a wetted solid wall (T < T_s). The change at T_s is traced to the onset of surface freezing, where the steep velocity gradient in the surface-pinned flow significantly increases the viscous dissipation near the surface.

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