The viscosity of liquid mixtures in e-vapor products (EVPs) is key to their performance and is sensitive to mixture composition and temperature. To date, no accurate model exists for the viscosities of said mixtures. Herein, we report an empirical model for the viscosity of liquid mixtures containing propylene glycol (PG), glycerol (GL), and water (W), representative of the mixtures in EVPs. The model captures the interactions between component liquids and makes accurate viscosity predictions for liquid mixtures of PG, GL, and W, as well as such mixtures containing small amounts of menthol, from 20 to 80 °C. The model is calibrated to new experimental data for PG–GL–W ternary mixtures and may be extended to incorporate different or additional liquids or a wider temperature range given additional fitting data. The model should also prove beneficial for food, cosmetic, and pharmaceutical products containing aqueous solutions of PG and GL.

中文翻译：

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丙二醇，甘油和水的液体混合物的粘度模型

电子蒸汽产品（EVP）中液体混合物的粘度是其性能的关键，并且对混合物的组成和温度敏感。迄今为止，还没有关于所述混合物的粘度的精确模型。本文中，我们报告了包含丙二醇（PG），甘油（GL）和水（W）的液体混合物的粘度的经验模型，该混合物代表了EVP中的混合物。该模型捕获了组分液体之间的相互作用，并对PG，GL和W的液体混合物以及含有少量薄荷醇的20至80°C的混合物进行了准确的粘度预测。该模型已针对PG–GL–W三元混合物的新实验数据进行了校准，并且可以扩展为包含其他液体或其他液体，或者在提供其他拟合数据的情况下可以包含更宽的温度范围。