A Thermohydrodynamic Analysis of Journal Bearings Lubricated by a Non-Newtonian Fluid

Our earlier work on the flow of a non-Newtonian fluid of the differential type in a journal bearing is extended here to include nonisothermal operations and temperature dependent viscosity. We show that for the type of lubricant investigated, even a slight departure from Newtonian behavior renders the bearing performance relatively insensitive to changes in lubricant temperature. But whether this change in lubricant behavior actually results in improved load capacity depends on the value and the sign of the material parameters.

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A Thermo-Elasto-Hydrodynamic Study of Journal Bearing With Controlled Deflection

Journal of Tribology ◽

10.1115/1.2921673 ◽

1993 ◽

Vol 115 (3) ◽

pp. 550-556 ◽

Cited By ~ 6

Author(s):

N. O. Freund ◽

A. K. Tieu

Keyword(s):

Thermal Effects ◽

Journal Bearing ◽

Load Capacity ◽

Three Dimensions ◽

The Finite Element Method ◽

Temperature Dependent ◽

Temperature Dependent Viscosity ◽

Lubricating Film ◽

Hydrodynamic Study ◽

Dependent Viscosity

A thermo-elasto-hydrodynamic study of a specially modified journal bearing is included. A numerical simulation is carried out by the finite element method, coupling the deflection of the bearing housing and the pressure derived from the Reynolds equation. In turn, this is coupled through its temperature dependent viscosity terms to the energy equation. Elastic effects are treated in three dimensions. Thermal effects are considered in three dimensions in both the lubricating film and bearing housing with convection specified on the housing boundaries. The bearing is specially modified with an undercut on the bearing housing. It will be demonstrated that by design an appropriate deflection of the undercut can be achieved to improve the load capacity.

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Mixed convective heat and mass transfer in a non-Newtonian fluid at a peristaltic surface with temperature-dependent viscosity

Archive of Applied Mechanics ◽

10.1007/s00419-007-0181-6 ◽

2007 ◽

Vol 78 (8) ◽

pp. 599-624 ◽

Cited By ~ 75

Author(s):

N. T. M. Eldabe ◽

M. F. El-Sayed ◽

A. Y. Ghaly ◽

H. M. Sayed

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Convective Heat ◽

Newtonian Fluid ◽

Temperature Dependent ◽

Temperature Dependent Viscosity ◽

Dependent Viscosity

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Numerical Study for the Effects of Temperature Dependent Viscosity Flow of Non-Newtonian Fluid with Double Stratification

Applied Sciences ◽

10.3390/app10020708 ◽

2020 ◽

Vol 10 (2) ◽

pp. 708 ◽

Cited By ~ 2

Author(s):

Hafiz Abdul Wahab ◽

Hussan Zeb ◽

Saira Bhatti ◽

Muhammad Gulistan ◽

Seifedine Kadry ◽

...

Keyword(s):

Newtonian Fluid ◽

Numerical Study ◽

Mathematical Formulation ◽

Nano Particles ◽

Physical Parameters ◽

Concentration Profiles ◽

Temperature Dependent ◽

Double Stratification ◽

Temperature Dependent Viscosity ◽

Dependent Viscosity

The main aim of the current study is to determine the effects of the temperature dependent viscosity and thermal conductivity on magnetohydrodynamics (MHD) flow of a non-Newtonian fluid over a nonlinear stretching sheet. The viscosity of the fluid depends on stratifications. Moreover, Powell–Eyring fluid is electrically conducted subject to a non-uniform applied magnetic field. Assume a small magnetic reynolds number and boundary layer approximation are applied in the mathematical formulation. Zero nano-particles mass flux condition to the sheet is considered. The governing model is transformed into the system of nonlinear Ordinary Differential Equation (ODE) system by using suitable transformations so-called similarity transformation. In order to calculate the solution of the problem, we use the higher order convergence method, so-called shooting method followed by Runge-Kutta Fehlberg (RK45) method. The impacts of different physical parameters on velocity, temperature and concentration profiles are analyzed and discussed. The parameters of engineering interest, i.e., skin fraction, Nusselt and Sherwood numbers are studied numerically as well. We concluded that the velocity profile decreases by increasing the values of S t , H and M. Also, we have analyzed the variation of temperature and concentration profiles for different physical parameters.

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