Research Article Open Access

Motor Oil Viscosity Stratification in Friction Units of Marine Diesel Motors

Sergey Viktorovich Sagin1 and Oleksandr Vladymyrovich Semenov1
  • 1 Department of Marine Power Plants, Odessa National Maritime Academy, Odessa, Ukraine


The phenomenon of the motor oil viscosity stratification in lubricating the cylinder-piston units of marine diesel engines has been investigated. The correlations for determining the shear stress and the velocity, occurring in the liquid flow between the parallel planes, have been given. The modes of the hydrodynamic and the boundary lubrication, taking place in the cylinder assembly of the marine diesel engine operation, have been considered. The methodology has been introduced for determining the viscosity of the boundary layer, which separates the surfaces of the piston ring and that of the cylinder bushing in the marine diesel motor operation. The results of the experiments, confirming the presence of the viscosity stratification in the boundary lubrication layer of the marine motor oil, have been submitted.

American Journal of Applied Sciences
Volume 13 No. 2, 2016, 200-208


Submitted On: 24 November 2015 Published On: 15 February 2016

How to Cite: Sagin, S. V. & Semenov, O. V. (2016). Motor Oil Viscosity Stratification in Friction Units of Marine Diesel Motors. American Journal of Applied Sciences, 13(2), 200-208.

  • 14 Citations



  • Marine Diesel Motor Oil
  • Marine Diesel Engine Cylinder-Piston Assembly
  • Hydrodynamic Lubrication
  • Boundary Lubrication
  • Liquid Flow
  • Shear Velocity
  • Viscosity Curve
  • Volumetric Viscosity
  • Boundary Layer Viscosity
  • Viscosity Stratification