The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Kyung Woong Kim - One of the best experts on this subject based on the ideXlab platform.
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Effects of Distance Between Pads on the Inlet Pressure Build-Up on Pad Bearings
Journal of Tribology, 2002Co-Authors: Jong-soo Kim, Kyung Woong KimAbstract:Full Navier-Stokes equations are solved numerically for a cavity region between two consecutive pads and a parallel lubricating film. Numerical solutions are obtained for a wide range of Reynolds number and various values of a distance between pads. Numerical results show that the Inlet Pressure build-up is significantly affected by Reynolds number and the distance between two adjacent pads. A new formula is derived of loss coefficient with Reynolds number and a distance factor, for using it in an extended Bernoulli equation, on the basis of numerical results. Experiments are conducted to investigate the validity of the formula of loss coefficient proposed by authors.
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Inlet Pressure effects on the thermohydrodynamic performance of a large tilting pad journal bearing
Journal of Tribology, 1995Co-Authors: Ho Jong Kim, Kyung Woong KimAbstract:Inlet Pressure effects on the thermohydrodynamic performance of a 4-pad large tilting pad journal bearing are investigated both theoretically and experimentally. The theory takes into account the Inlet Pressure and the three-dimensional variation of oil viscosity and eddy viscosity. Film Pressure, film thickness, bearing metal temperature, load capacity, and eccentricity are measured by experiments. A noticeable Inlet Pressure rise is observed at the entrance of pads. It is shown that the Inlet Pressure increases not only the film Pressure and the load capacity but also the supply flow rate, while it decreases the mixing and bearing surface temperature. The bearing characteristics predicted by the turbulent thermohydrodynamic theory, including the Inlet Pressure, are in good agreement with the experimental results. Therefore it can be suggested that the Inlet Pressure must be taken into account in theoretical calculations in order to predict the thermohydrodynamic performance of large tilting pad journal bearings accurately
A I Khandwawala - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of 120 mw thermal power plant with combined effect of constant Inlet Pressure 127 06 bar and different condenser back Pressures
2014Co-Authors: Ankur Geete, A I KhandwawalaAbstract:Thermal power plants are used to generate power. They are designed based on the required conditions, but actually Inlet conditions are not as per the designed conditions. Variations in the power outputs from the power plant are always a matter of dispute. So correction curves for power and heat rate are generated. In this paper, a thermodynamic analysis of 120 MW thermal power plant was done at a particular Inlet Pressure (127.06 bar) and at different condenser back Pressures (0.068 bar, 0.088 bar, 0.1015 bar, 0.107 bar, 0.127 bar and 0.142 bar). The correction curves for power and heat rate were generated for the combined effect of constant Inlet Pressure and different condenser back Pressures. These curves indicate that if Inlet Pressure is 127.06 bar and condenser back Pressures vary, simultaneously power output and heat rate also vary.
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thermodynamic analysis of 120 mw thermal power plant with combined effect of constant Inlet Pressure 124 61 bar and different Inlet temperatures
Case Studies in Thermal Engineering, 2013Co-Authors: Ankur Geete, A I KhandwawalaAbstract:Abstract The thermal power plants are used to generate power. The thermal power plants are designed based on required conditions, but actually Inlet conditions are not as per the designed conditions. Variations in the power outputs from power plant are always a matter of disputes. So correction curves for power and heat rate are generated. In this paper, the thermodynamic analysis of 120 MW thermal power plant has been done at particular Inlet Pressure (124.61 bar) and at different Inlet temperatures (507.78 °C, 517.78 °C, 527.78 °C, 537.78 °C, 547.78 °C, 557.78 °C, and 567.78 °C). The correction curves for power and heat rate have been generated for combined effect of Inlet Pressure and different Inlet temperatures. These curves indicate that if Inlet Pressure is 124.61 bar and Inlet temperatures vary, then power output and heat rate also vary.
C. M. Rodkiewicz - One of the best experts on this subject based on the ideXlab platform.
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On the Thermal Effects in the Design of Tilting-Pad Bearings Subjected to Inlet Pressure Build-Up
Journal of Tribology, 1991Co-Authors: K. W. Kim, C. M. RodkiewiczAbstract:The presented analytical consideration of tilting-pad bearings incorporates simultaneously the changes in viscosity (due to viscous dissipation) and in the nonambient Inlet Pressure (due to momentum depletion within the fore-region). The solution provides the following quantities: film temperature distributions, Pressure distribution, maximum temperature of the pad, load capacity, friction force, coordinate of the center of Pressure, and coordinate of the pivot point. Comparison with the case when the Inlet Pressure is assumed to be ambient indicates the significance of the Pressure build-up in the fore-region.
Ankur Geete - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of 120 mw thermal power plant with combined effect of constant Inlet Pressure 127 06 bar and different condenser back Pressures
2014Co-Authors: Ankur Geete, A I KhandwawalaAbstract:Thermal power plants are used to generate power. They are designed based on the required conditions, but actually Inlet conditions are not as per the designed conditions. Variations in the power outputs from the power plant are always a matter of dispute. So correction curves for power and heat rate are generated. In this paper, a thermodynamic analysis of 120 MW thermal power plant was done at a particular Inlet Pressure (127.06 bar) and at different condenser back Pressures (0.068 bar, 0.088 bar, 0.1015 bar, 0.107 bar, 0.127 bar and 0.142 bar). The correction curves for power and heat rate were generated for the combined effect of constant Inlet Pressure and different condenser back Pressures. These curves indicate that if Inlet Pressure is 127.06 bar and condenser back Pressures vary, simultaneously power output and heat rate also vary.
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thermodynamic analysis of 120 mw thermal power plant with combined effect of constant Inlet Pressure 124 61 bar and different Inlet temperatures
Case Studies in Thermal Engineering, 2013Co-Authors: Ankur Geete, A I KhandwawalaAbstract:Abstract The thermal power plants are used to generate power. The thermal power plants are designed based on required conditions, but actually Inlet conditions are not as per the designed conditions. Variations in the power outputs from power plant are always a matter of disputes. So correction curves for power and heat rate are generated. In this paper, the thermodynamic analysis of 120 MW thermal power plant has been done at particular Inlet Pressure (124.61 bar) and at different Inlet temperatures (507.78 °C, 517.78 °C, 527.78 °C, 537.78 °C, 547.78 °C, 557.78 °C, and 567.78 °C). The correction curves for power and heat rate have been generated for combined effect of Inlet Pressure and different Inlet temperatures. These curves indicate that if Inlet Pressure is 124.61 bar and Inlet temperatures vary, then power output and heat rate also vary.
Tal M. Nahir - One of the best experts on this subject based on the ideXlab platform.
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Nonsteady-state flow in gas chromatography during fast changes in Inlet Pressure.
Journal of chromatography. A, 2004Co-Authors: Tal M. NahirAbstract:The steady-state assumption for describing the flow in a capillary gas chromatography column fails when changes in Inlet Pressure are introduced at a fast rate. To accommodate the possibility of nonsteady-state conditions, or a transient behavior, a second-order nonlinear differential equation for the Pressure is suggested. Good agreement between the new theoretical model and representative experimental results is shown when the Inlet Pressure is increased at a rate of several hundred kPa per minute; in contrast, predictions from traditional steady-state calculations are relatively poor.
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Linear programming of Inlet Pressure or flow-rate in isothermal gas chromatography with near-vacuum outlet Pressure.
Journal of Chromatography A, 2001Co-Authors: Tal M. Nahir, Jeffrey A. GerbecAbstract:The equation of motion for a peak in a gas chromatography experiment is shown to be exact whenever the column outlet Pressure is approximately zero. Based on steady-state assumptions, this equation is solved for an isothermal analysis with a single-ramp Inlet-Pressure or flow-rate program. Theoretical calculations of retention times are confirmed experimentally for two n-alkanes using a capillary column connected to a mass-selective detector. A slight but consistent discrepancy between theoretical and measured results is interpreted as a failure of the steady-state assumption when the magnitude of the rate of change of Inlet Pressure is large.
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Constant holdup times in gas chromatography by programming of column temperature and Inlet Pressure
Analytical chemistry, 2000Co-Authors: Tal M. Nahir, Kathryn M. MoralesAbstract:The requirements for attaining constant holdup times in capillary gas chromatography (GC), while linearly programming both column temperature and Inlet Pressure, are illustrated. A scheme, which is based on a series of responses from isothermal and isobaric conditions, is proposed. The responses from two commonly used GC instruments, one with a mass-selective detector operating at near-vacuum Pressure and another with a flame-ionization detector at ambient Pressure, are analyzed. A significant deviation from Poiseuille flow is noted due to the use of helium as a carrier gas. Nonetheless, the experimental holdup times are approximately constant over a range of temperatures and Pressures. Theoretical analysis reveals the spatial and temporal dependence of flow rates inside the column during the programmed runs.