Author/Authors :
TİMURALP, Çisil ESOGÜ - Müh-Mim Fak - Makine Mühendisliği Bölümü, Turkey , ÜREYEN, İrfan ESOGÜ - Müh-Mim Fak - Makine Mühendisliği Bölümü, Turkey
Abstract :
Liquid lubricants are used in the industry at many areas for generating a thin layer in order to reduce the wear and friction of the two surface working under specific force. Therefore, to be able to choose proper lubricant for the used system, viscosity, thermal properties, solidification point, flashing point, and similar features should be known. Viscosity value is the most important feature among these. However, the viscosity value of the liquid lubricant decreases when the temperature rises, and increases when temperature falls. Therefore, viscosity index is used to relatively identify the viscosity variation via temperature. In this study, samples are taken from 3 different brands of manufacturers mineral lubricant. Flow time is measured by Saybolt viscometer, a type of orifice viscometer. All lubricants are held at 400C constant temperature. Viscosity values, indexes of the lubricants are calculated by using obtained flow periods and deviation values are investigated by comparing with values given by the companies which own the brands.
