Showing papers by "Satish C. Sharma published in 2001"
TL;DR: In this paper, the combined effect of non-Newtonian lubricant behavior and bearing shell flexibility on the performance of an orifice compensated multirecess hydrostatic/hybrid journal bearing system is studied.
Abstract: The combined effect of non-Newtonian lubricant behavior and bearing shell flexibility on the performance of an orifice compensated multirecess hydrostatic/hybrid journal bearing system is studied. The analysis considers the constitutive equations for the flow of a non-Newtonian lubricant through an orifice restrictor, the generalized Reynold's equation governing the flow of lubricant having variable viscosity and 3-D elasticity equations. The computed results demonstrate that loss in bearing performance due to the pseudo-plastic effect of the non-Newtonian lubricant can be mitigated by a proper selection of parameters such as the deformation coefficient ([Cbar]4) and non-linearity factor ([Kbar]) or power law index (n).
33 citations
TL;DR: In this article, a theoretical study describing comparative performance of non-recessed hybrid journal bearing using different flow control devices has been carried out by considering bearing shell flexibility into the analysis, the relevant governing equations have been solved using finite element method.
Abstract: For bearings operating under heavy loads, the elastic deformation of bearing surface induced by fluid film pressures can no longer be neglected as it is comparable to the order of magnitude of fluid film thickness. In the present work a theoretical study describing comparative performance of non-recessed hybrid journal bearing using different flow control devices has been carried out by considering bearing shell flexibility into the analysis. The relevant governing equations have been solved using finite element method. The comparative performance of non-recessed hybrid journal bearings of two separate configurations have been studied for various values of bearing flexibility parameter (([Cbar]d)). The results have been presented for hole-entry type journal bearings compensated by capillary, orifice and constant flow valve restrictors and for a slot-entry type journal bearing, for the same set of values of operating and geometric parameters. The computed results indicates that in order to get an improved ...
32 citations
TL;DR: In this article, a vertical U-tube is made to pass through a vertical shaker and at the same time it is vibrated by a shaker, the rotary motion produced as a result of vibration causes Coriolis force to act on the tube and causes it to twist.
Abstract: In many process industries, mass flow rate is the desired parameter rather than the volume flow rate. There are two approaches to measure mass flow rate. In the first approach, volume flow rate is measured and then it is multiplied with density. The second approach utilizes the flow metering concepts which are sensitive to mass flow rate. The work presented here falls in the second category. Here, the fluid is made to pass through a vertical U-tube and at the same time it is vibrated by a shaker. The rotary motion produced as a result of vibration causes Coriolis force to act on the tube and causes it to twist. Because of the twisting action, the two limbs of the tube do not pass through the mean position simultaneously. The resulting time lag (Δt) is measured with the help of an 8085 microprocessor and two proximity pick-ups. Mass flow rate is directly proportional to time lag (Δt) and is calculated and displayed subsequently after multiplying time lag (Δt) with a constant of proportionality. The work pr...
1 citations
01 Jan 2001
TL;DR: The effect of surface roughness on the performance of a constant flow valve compensated misaligned hole-entry hybrid journal bearing system has been theoretically studied in this article, where a pair of misalignment parameters ϕ and δ are used to modify the classical Reynolds equation for a rough surface journal bearing.
Abstract: The effect of surface roughness on the performance of a constant flow valve compensated misaligned hole-entry hybrid journal bearing system has been theoretically studied. The journal misalignment has been accounted by defining a pair of misalignment parameters ϕ and δ . The pressure and shear flow factors are used to modify the classical Reynolds equation for a rough surface journal bearing. The non-dimensional parameters Λ (surface roughness parameter) and γ (surface pattern parameter) have been defined to represent the magnitude of height distribution of surface roughness and their orientation respectively. The bearing performance has been studied for the isotropic surface patterns of the hole-entry hybrid journal bearing configuration. The study indicates that for prediction of realistic bearing characteristic data, the inclusion of surface roughness effects in the analysis is essential.