Elastohydrodynamic (EHD) Traction Properties of Seed Oils1
Elastohydrodynamic (EHD) Traction Properties of Seed Oils1
复制标题
种子油的弹流动力学 (EHD) 牵引特性1
DOI：
10.1080/10402001003599769
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发表时间：
2010
影响因子：
2.1
通讯作者：
Grigor B. Bantchev
中科院分区：
文献类型：
--
作者：
G. Biresaw;Grigor B. Bantchev
使用球盘牵引装置研究了九种不同化学结构的种子油、聚α烯烃油（PAO）和十六烷的弹流体动力牵引系数（tc）特性。种子油为蓖麻油，一种带有羟基官能团的甘油三酯；荷荷巴油，一种单酸甘油酯；以及七种具有不同脂肪酸组成的甘油三酯种子油。在恒定温度（40 或 100°C）和恒定负载（10、20、30 或 40 N）下进行了两种类型的实验：tc 作为 1 m/s 夹带速度 (u) 下滑滚比 (srr) 的函数； tc 是 50% srr 时 u 的函数。在这两种类型的实验中，tc 随着温度的降低、负载的增加和 srr 的增加而增加。所有 u 与 tc 实验都给出了熟悉的 Stribeck 型配置文件。在一些 srr 与 tc 实验中观察到 tc 值的最大值。回归分析显示，这两种类型的实验的限制 tc（1 m/s u 和 50% srr 下的 tc）值非常一致。十六烷和 PAO 的 tc 值高于种子油，尽管它们的粘度分别比种子油低 80 倍和 7 倍。这一观察结果不能用分子结构论证来合理化。结果归因于两组油之间极性的差异。与 PAO 和十六烷不同，种子油是极性的，吸附在摩擦表面上，并降低边界摩擦，这有助于降低 EHD 状态下的 tc。
The elastohydrodynamic traction coefficient (tc) properties of nine seed oils of varying chemical structures, polyalphaolefin oil (PAO) and hexadecane, were investigated using a ball-on-disk traction apparatus. The seed oils were castor oil, a triglyceride with hydroxyl functional group; jojoba, a monoglyceride; and seven triglyceride seed oils with varying fatty acid compositions. Two types of experiments were conducted at constant temperature (40 or 100°C) and constant load (10, 20, 30, or 40 N): tc as a function of slide-to-roll ratio (srr) at 1 m/s entrainment speed (u); and tc as a function of u at 50% srr. In both types of experiments, tc increased with decreasing temperature, increasing load, and increasing srr. All u vs. tc experiments gave the familiar Stribeck-type profiles. A maximum in tc values was observed in some srr vs. tc experiments. Regression analysis showed excellent agreement between limiting tc (tc at 1 m/s u and 50% srr) values from these two types of experiments. Hexadecane and PAO displayed higher tc values than the seed oils, even though their viscosities were up to 80 and 7 times lower, respectively, than that of seed oils. This observation cannot be rationalized using molecular structure arguments. The results were attributed to differences in polarity between the two groups of oils. Unlike PAO and hexadecane, seed oils are polar, adsorb on friction surfaces, and lower boundary friction, which contributes to the lowering of tc in the EHD regime.