A new temperature-dependent correlation for the reduced influence parameter of the density gradient theory, when used with the Peng-Robinson equation of state, is proposed and compared with other correlations found in the literature. The proposed correlation is linear in its two fitting parameters and contains a universal exponent related to the one from the liquid-vapor phase transition universal scale law. The overall absolute deviation (OAAD) respect 1275 surface tension data for 39 esters is 1.37%. Only the proposal from Zuo and Stenby with OAAD = 1.29%, yields similar results with the same number of parameters.

Fitting parameters for the new correlation proposed and those from Zuo and Stenby are given for the fluids considered in this work.

当与 Peng-Robinson 状态方程一起使用时，提出了一种新的密度梯度理论的降低影响参数的温度相关相关性，并与文献中发现的其他相关性进行了比较。所提出的相关性在其两个拟合参数中是线性的，并且包含与来自液-气相变通用尺度定律的通用指数相关的通用指数。39 种酯的 1275 表面张力数据的总体绝对偏差 (OAAD) 为 1.37%。只有 Zuo 和 Stenby 提出的 OAAD = 1.29% 的提议，在相同数量的参数下产生了相似的结果。

提出的新相关性以及 Zuo 和 Stenby 的拟合参数适用于本工作中考虑的流体。