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粘度計的分類

发表时间：2018-12-24 17:31

粘度計的分類

液體受外力作用移動時，液體分子間産生的內摩擦力的性質，稱爲粘度。粘度分爲動力粘度（**粘度）、運動粘度和條件粘度。因采用不同的特定粘度計，又分爲恩氏粘度、賽氏粘度和雷氏粘度。

（1）運動粘度和動力粘度

? ? 某流体的动力粘度与该流体在同一温度和压力下的密度之比，称为该流体的运动粘度。运动粘度v和动力粘度η两者的关系是v=η/ρ ,动力粘度η的单位是g/cm.s;运动粘度v的单位是cm2/s，而实际生产中常用mm2/s作为油品质量之比中的运动粘度v的单位。

（2）恩氏粘度

? ?条件粘度是指采用不同的特定粘度计，所测得的以条件单位表示的粘度。恩氏粘度即恩格勒粘度是条件粘度的一种。它是指一定量的试样，在规定温度（如50°C，80°C，100°C）下，从恩氏粘度计留出200ml所需的时间（s）与同体积水在20°C从恩氏粘度计流出所需时间（s）（即恩氏粘度计的水值）的比值。以符号“E”表示。在温度t°C时，恩氏粘度计以Et表示，单位为“条件度”，用符号“°E”代表。条件粘度可以相对的衡量油品的流动性，但它不具有任何物理意义，只是一个公称值。各种表示方法之间可以换算，换算条件是温度必须相同。

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文章分類：技術知識

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