完全轮廓法计算液体表面张力的改进

周斌; 李思维; 陈志勇; 张嵘

doi:10.16511/j.cnki.qhdxxb.2016.25.047

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清华大学学报（自然科学版） ›› 2016, Vol. 56 ›› Issue (12) : 1352-1356. DOI: 10.16511/j.cnki.qhdxxb.2016.25.047

精密仪器与机械学

完全轮廓法计算液体表面张力的改进

周斌, 李思维, 陈志勇, 张嵘

作者信息 +

Full-profile fit pendent drop method for surface tension measurements

ZHOU Bin, LI Siwei, CHEN Zhiyong, ZHANG Rong

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文章历史 +

摘要

为了提高液体表面张力测量的准确性和稳定性，该文基于悬滴法中完全轮廓法计算原理，改进了二维寻优算法中变量初值的选取方法，并利用权重因子对变量误差函数进行了修正，减小了液滴轮廓偏离点对表面张力测量结果的影响。在温度为25℃，常压条件下，利用改进后的完全轮廓法对水和无水乙醇表面张力进行了测量，结果表明：改进后的完全轮廓法相比原完全轮廓法测量标准差减小了40%，充分证明改进后的完全轮廓法具有更好的测量重复性和稳定性。

Abstract

The accuracy and stability of surface tension measurements are improved fitting the entire surface profile in the pendent drop method with an algorithm to determine the initial value for two-dimensional optimization. Moreover, the error function was modified by a weighting factor which reduced the influence of the droplet profile deviation point on the surface tension measurement. The full-profile fitting method was used to calculate the surface tension of water and ethanol at 25℃ and atmosphere. The final results show the standard deviation was reduced by 40% compared with the previous method, which verifies the stability and repeatability of this full-profile fitting pendent drop method.

导出引用

周斌, 李思维, 陈志勇, 张嵘. 完全轮廓法计算液体表面张力的改进[J]. 清华大学学报（自然科学版）. 2016, 56(12): 1352-1356 https://doi.org/10.16511/j.cnki.qhdxxb.2016.25.047

ZHOU Bin, LI Siwei, CHEN Zhiyong, ZHANG Rong. Full-profile fit pendent drop method for surface tension measurements[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(12): 1352-1356 https://doi.org/10.16511/j.cnki.qhdxxb.2016.25.047

中图分类号： O552.4+21

参考文献

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收稿日期	出版日期
2016-01-19	2016-12-15
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2016-12-15

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