Surface tension is an important biodiesel property, its calculation and prediction are fundamental because high values of surface tension significantly difficult proper atomization, and it can cause a poor engine performance. Surface tensions have been measured for binary liquid blends of pentan-1-ol, pentan-2-ol, 2-methylbutan-1-ol, octan-1-ol, octan-2-ol and 2-ethylhexan-1-ol with biodiesel using a Du Noüy ring tensiometer from (288.15 to 338.15) K at 0.1 MPa over the whole composition range. The measured surface tension data for the pure components shows a good agreement for the six alcohols when it is compared with reported values in the literature, showing an average absolute percentage deviation of 0.93%. Surface tension deviations show positive deviations from the average mole fraction of the pure components and they are correlated using the Redlich-Kister equation over the whole concentration range. Surface entropy and surface enthalpy have been estimated from experimental surface tension values of biodiesel mixtures. A new equation has been developed to correlate the surface tension of biodiesel + alcohols mixtures considering the effects of both temperature and mole fraction. This equation is based upon a quadratic mixing rule for the Gibbs free energy. Our model demonstrates to correlate the surface tension of biodiesel mixtures with an average absolute percentage deviation of 0.4%. The correlative capability of the proposed model is compared with Li et al., Fu et al., Myers and Scott, Wang-Chen, Hoke and Patton, and Jouyban et al. equations.

表面张力是重要的生物柴油性质，其计算和预测至关重要，因为高表面张力值会严重影响适当的雾化，并可能导致发动机性能下降。已经测量了戊丹1醇，戊丹2醇，2-甲基丁烷1醇，辛烷1醇，辛烷2醇和2-乙基己基1醇与在整个组成范围内使用0.1 MPa的DuNoüy环张力计（288.15至338.15）K制备生物柴油。当将其与文献中报道的值进行比较时，所测得的纯净组分的表面张力数据显示了六种醇的良好一致性，表明平均绝对百分比偏差为0.93％。表面张力偏差显示出与纯组分的平均摩尔分数的正偏差，并且使用Redlich-Kister方程将其与整个浓度范围相关。表面熵和表面焓已根据生物柴油混合物的实验表面张力值进行了估算。考虑到温度和摩尔分数的影响，已经开发出新的方程式来关联生物柴油+醇混合物的表面张力。该方程基于吉布斯自由能的二次混合规则。我们的模型表明，生物柴油混合物的表面张力与0.4％的平均绝对百分比偏差相关。将所提出模型的相关能力与Li等人，Fu等人，Myers和Scott，Wang-Chen，Hoke和Patton以及Jouyban等人进行了比较。方程。