Abstract
Abstract (1) Measurements of the kinetic friction coefficient have been made to study the oiliness of liquids. The method consists of the observation of the sliding velocity of a slider on an inclined surface lubricated with the liquid to be tested. Special apparatus has been constructed to measure the sliding velocity. (2) It is confirmed that the kinetic friction coefficient is generally independent of the velocity over the range of the experiment (up to about 100 cm./sec.), and the following equation holds. (Remark: Graphics omitted.) where v is the mean velocity of the slider on the surface of the inclination θ. The above equation lacks the viscosity term, so the conditons of the boundary lubrication are considered to be satisfied. (3) The kinetic friction coefficients of glycerin, aliphatic hydrocarbons, aliphatic alcohols, acetic acid, and water have been measured.
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