Toms 효과가 있는 저어널베어링에서의 k-ε 모델을 이용한 성능해석

Abstract

Recently the utilization of journal bearings operation in the turbulent regime is increased, thus frictional loss in turbulent journal bearing becomes an important problem.It is known that frictional loss can be reduced by adding small amount of a certain high polymer to be turbulent flowing liquid. This phenomenon is Toms`` effect.In the present study, a turbulent lubrication theory using k-ε model is employed to describe the operating characteristic of journal bearing with the without drag reduction.The results obtained from the theory are compared with experiments for flows with and without drag reduction.