Numerical analysis of elastohydrodynamic lubrication with non newtonian lubricant

Abstract

Elastohydrodynamic lubrication is a form of hydrody namic lubrication involving physical interaction between two contacting surface s and liquid where elastic deformation of the contacting surfaces due to heavily loading applied will affect the elastohydrodynamic pressure and fluid film thickness significantly. In this paper, a line contact EHL is modeled through the cylinder contact to a flat surface to represent the applicat ion of roller bearing. This solution is limited to two dimensional line contact problem only, an infinite length of cylinder was used as physical modeling. The behavior of non-Newtonian fluid also was invest igated using power law fluid model. Bearing speed is to be assumed in steady state and temperat ure is assumed constant. The bearing performance parameters such as pressure and film th ickness of lubricated contacts are calculated using Newton-Raphson method.The results show that t he peak pressure increases as the parameters such as velocity, load and material parameter were increases and the spike was found to shift to the center of roller. The film was almost flat at conta ct region and formed a dimple shape near the outlet flow. The value of pressure spike and minimu m film thickness were smaller at lower speed and were increased during raising speed then the pe ak point was found to be shifted to center of roller.