Full-profile fit pendent drop method for surface tension measurements

ZHOU Bin; LI Siwei; CHEN Zhiyong; ZHANG Rong

doi:10.16511/j.cnki.qhdxxb.2016.25.047

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (12) : 1352-1356. DOI: 10.16511/j.cnki.qhdxxb.2016.25.047

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Full-profile fit pendent drop method for surface tension measurements

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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.

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surface tension / full-profile fitting method / pendent drop

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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

References

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