Contact angle temperature dependence for water droplets on practical aluminum surfaces
Contact angle temperature dependence for water droplets on practical aluminum surfaces
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DOI：
10.1016/0017-9310(96)00184-6
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发表时间：
1997-03-01
影响因子：
5.2
通讯作者：
Franses, EI
中科院分区：
文献类型：
--
作者：
Bernardin, JD;Mudawar, I;Franses, EI
本文对水在按照沸腾传热研究中常用的表面制备技术抛光的铝表面上的准静态前进接触角与温度的关系进行了实验研究。表面，推测含有氧化铝和有机残留物留下的抛光过程中，其特征在于与扫描电子显微镜，表面接触轮廓术，和椭圆偏振。通过利用压力容器来提高液体饱和温度，用座滴技术在表面温度从25 ° C至170 ° C和压力从101.3至827.4kPa的范围内测量接触角。在低于120 ° C的较低温度范围内，观察到90度的相对恒定的接触角。在高于120 ° C的高温状态下，接触角以相当线性的方式减小。经验的相关性来描述这种行为，模拟以前的非金属表面的实验数据以及理论趋势。版权所有（C）1996 Elsevier Science Ltd.
zThis paper presents an experimental investigation of the temperature dependence of the quasistatic advancing contact angle of water on an aluminum surface polished in accordance with surface preparation techniques commonly employed in boiling heat transfer studies. The surface, speculated to contain aluminum oxide and organic residue left behind from the polishing process, was characterized with scanning electron microscopy, surface contact profilometry, and ellipsometry. By utilizing a pressure vessel to raise the liquid saturation temperature, contact angles were measured with the sessile drop technique for surface temperatures ranging from 25 to 170 degrees C and pressures from 101.3 to 827.4 kPa, Two distinct temperature-dependent regimes were observed. In the lower temperature regime, below 120 degrees C, a relatively constant contact angle of 90 degrees was observed. In the high temperature regime, above 120 degrees C, the contact angle decreased in a fairly linear manner. Empirical correlations were developed to describe this behavior which emulated previous experimental data for nonmetallic surfaces as well as theoretical trends. Copyright (C) 1996 Elsevier Science Ltd.