An Experimental and Theoretical study of Lubricant flow rate in Static, Grooved, Rectangular Thrust Bearings

1982 ◽  
Vol 24 (1) ◽  
pp. 21-29 ◽  
Author(s):  
D. J. Hargreaves ◽  
C. M. Taylor
Keyword(s):  
Liquid Film ◽  
Flow Rate ◽  
Theoretical Study ◽  
Film Formation ◽  
Research Programme ◽  
Journal Bearings ◽  
Thrust Bearings ◽  
Rate Prediction ◽  
Lubricant Flow ◽  
Lubricant Films

The work to be described here was undertaken in the preliminary stages of a research programme designed to study the true extent of lubricant films in non-stationary, grooved, rectangular thrust bearings. In such externally pressurized bearings an air-lubricant interface may be formed. The study of this interface was seen as a useful step in a consideration of film formation and flow rate prediction in liquid film journal bearings.

Analysis of Multirecess Hydrostatic Journal Bearing Operating With Micropolar Lubricant

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Suresh Verma ◽  
Vijay Kumar ◽  
K. D. Gupta
Keyword(s):  
Reynolds Equation ◽  
Theoretical Study ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Performance Characteristics ◽  
Constant Flow ◽  
The Finite Element Method ◽  
Lubricant Flow ◽  
Wide Range ◽  
Flow Valve

This paper presents a theoretical study of the performance characteristics of a constant flow valve compensated multirecess hydrostatic journal bearings operating with micropolar lubricant. The finite element method and iterative procedure have been used to solve the modified Reynolds equation governing the micropolar lubricant flow in the bearing. The performance characteristics are presented for a wide range of nondimensional load, lubricant flow, and micropolar parameters. It has been observed that the micropolar parameters significantly influence the performance characteristics of the bearing.

An Experimental and Theoretical Study of Lubricant Film Extent and Flowrate in Grooved Rectangular Pad Slider Thrust Bearings

1984 ◽  
Vol 198 (4) ◽  
pp. 225-233
Author(s):  
D J Hargreaves ◽  
C M Taylor
Keyword(s):  
Theoretical Study ◽  
Journal Bearings ◽  
Lubricant Film ◽  
Accurate Assessment ◽  
Interface Position ◽  
Thrust Bearings ◽  
Analysis Scheme ◽  
Wide Range ◽  
The Reformation ◽  
Theoretical Predictions

In liquid lubricated journal bearings an accurate assessment of the flowrate requires detailed consideration of the extent of the cavitated or ruptured region. Particular difficulties are encountered analytically when attempting to locate the boundary where the lubricant film reforms, normally in the vicinity of a supply groove. Most bearing analyses omit a consideration of this reformation boundary because of such difficulties. However, it is now widely recognized that the prediction of flowrate may be seriously in error if reformation effects are not incorporated in the analysis. In the present paper an externally pressurized, grooved, rectangular pad, slider hearing is examined. An air-lubricant interface may form in such a bearing which is akin to the reformation boundary encountered in journal bearings. A numerical analysis scheme to locate the interface is described in detail and theoretical predictions of bearing flowrate and interface position presented for a wide range of conditions. A comparison of the analytical predictions with experimental measurements is undertaken.

Paper 15: Thermal Aspects of Hydrodynamic Journal Bearing Performance at High Speeds

1966 ◽  
Vol 181 (15) ◽  
pp. 127-135 ◽  
Author(s):  
R. G. Woolacott ◽  
W. L. Cooke
Keyword(s):  
Flow Rate ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Inlet Temperature ◽  
Flow Rates ◽  
High Speeds ◽  
Lubricant Flow ◽  
Hydrodynamic Journal Bearing ◽  
Temperature And Pressure

This paper describes a rig for testing journal bearings at high speeds under steady loads and reports on measurements of bearing and lubricant temperatures and lubricant flow-rates for hydrodynamic journal bearings operating at speeds up to 35 000 rev/min and mean bearing pressures up to 3333 lbf/in2. Variations of temperature and flow-rate with load, speed, oil-inlet temperature and pressure, clearance, and oil-inlet grooving are also described, and the effects of bearing and lubricant temperatures on bearing performance are discussed.

Centrifugal Effects in Misaligned Hydrostatic Thrust Bearings

1983 ◽  
Vol 105 (4) ◽  
pp. 621-624 ◽  
Author(s):  
Z. S. Safar
Keyword(s):  
Flow Rate ◽  
Load Capacity ◽  
Friction Torque ◽  
Centrifugal Forces ◽  
Thrust Bearings ◽  
Lubricant Flow

An analysis is conducted and solutions are provided for the effect of centrifugal forces on hydrostatic misaligned thrust bearings. The results show that centrifugal forces reduce considerably the load capacity, the friction torque and increase the lubricant flow rate. It is found that the effect of centrifugal forces is decreased as tilting of the bearing is increased.

Computational and theoretical research of the injector block function

2020 ◽  
pp. 123-126
Author(s):  
В.В. Кожемякин ◽  
Р.А. Иванов ◽  
Е.С. Игнатьева
Keyword(s):  
Hydraulic Resistance ◽  
Cross Section ◽  
Flow Rate ◽  
Pressure Dependence ◽  
Theoretical Study ◽  
Water Jet ◽  
Theoretical Research ◽  
Sudden Expansion ◽  
Operating Modes ◽  
Coefficient Of Hydraulic Resistance

Работа посвящена расчетно-теоретическому исследованию работы блока инжекторов. Рассмотрен пароводяной струйный аппарат, который применяется в качестве средства циркуляции теплоносителя первого контура. Подвод дополнительного потока осуществляется на цилиндрическом участке с внезапным расширением сечения через перемычку. Для достижения поставленной цели разработана программа для ЭМВ, в которой смоделирована зависимость давления от нагрузки в контуре, а также проведено расчетно-теоретическое исследование влияние гидравлического сопротивления на расход перемычки. В данной работе рассмотрены только рабочие режимы, т.е. все инжекторы работают как насосы. В ходе работы было установлено, что при нагрузке в 30% увеличиваются коэффициенты инжекции пароводяного струйного аппарата, но характер работы перемычек не меняется. Так же было установлено, что расход через перемычку меняется не пропорционально коэффициенту гидравлического сопротивления перемычки. The paper is devoted to the computational and theoretical study of the injector block operation. A steam-water jet apparatus is considered, which is used as a means of circulating the primary circle coolant. The additional flow is supplied on the cylindrical section with a sudden expansion of the cross-section through the bridge. To achieve this goal, a computer program was developed that modeled the pressure dependence on the load in the circuit, and also a theoretical study of the influence of hydraulic resistance on the flow of the jumper was conducted. In this paper, only operating modes are considered, i.e. all the injectors function as pumps. In the process of the research, it was found that at a load of 30%, the injection coefficients of the steam-water jet apparatus increase, but the nature of the work of the jumpers does not change. It was also found out that the flow rate through the jumper does not change in proportion to the coefficient of hydraulic resistance of the jumper.

scholarly journals Study of Injection Method for Maximizing Oil-Cooling Performance of Electric Vehicle Motor with Hairpin Winding

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 747
Author(s):  
Taewook Ha ◽  
Dong Kyu Kim
Keyword(s):  
Electric Vehicle ◽  
Flow Rate ◽  
Film Formation ◽  
Formation Rate ◽  
Cooling Performance ◽  
Oil Film ◽  
Injection Method ◽  
Cooling Method ◽  
Oil Flow ◽  
Oil Injection

The oil injection method was studied to maximize the cooling performance of an electric vehicle motor with a hairpin winding. The cooling performance of the motor using the oil cooling method is proportional to the contact area of the oil and the coil. A numerical analysis was conducted to examine the effect of the spray nozzle type on the oil flow. The dripping nozzle forms the thickest oil film on the coil, making it the most effective for cooling of hairpin-type motors. Subsequently, an experimental study was conducted to optimize the nozzle diameter and number of nozzles. When the inlet diameter and number was 6.35 mm and 6, the oil film formation rate was 53%, yielding the most uniform oil film. Next, an experiment was performed to investigate the effects of the oil temperature and flow rate on the oil flow. The oil film formation rate was the highest (83%) when the oil temperature was 40 °C and the flow rate was 6 LPM.

An Approximate THD Theory for Journal Bearings

1990 ◽  
Vol 112 (2) ◽  
pp. 224-229 ◽  
Author(s):  
G. Gupta ◽  
C. R. Hammond ◽  
A. Z. Szeri
Keyword(s):  
Journal Bearing ◽  
Load Capacity ◽  
Pressure Coefficient ◽  
Journal Bearings ◽  
Maximum Pressure ◽  
Substantial Agreement ◽  
Interactive Mode ◽  
Lubricant Flow ◽  
Bearing Load ◽  
Sophisticated Model

The aim of this paper is to make available to the industrial designer results of the thermohydrodynamic theory of journal bearings, by providing a simplified, yet accurate model of journal bearing lubrication that can be implemented on a personal computer and be used in an interactive mode. The simplified THD theory we propose consists of two coupled ordinary differential equations for pressure and energy and an algebraic equation for viscosity, which are to be solved iteratively. Bearing load capacity, maximum bearing temperature, maximum pressure, coefficient of friction and lubricant flow rate calculated from this simplified theory compare well with results from a more sophisticated model. We also make comparisons with experimental data on full journal bearings, demonstrating substantial agreement between experiment and simplified theory.

Effect Of The Rib Inclination Angle On Liquid Film Spreading Over The Structured Surface

2015 ◽  
Vol 10 (1) ◽  
pp. 42-49
Author(s):  
Aleksandr Pavlenko ◽  
Oleg Volodin ◽  
Vladimir Serdyukov
Keyword(s):  
Liquid Film ◽  
Flow Rate ◽  
Inclination Angle ◽  
High Speed ◽  
Film Flow ◽  
Complex Geometry ◽  
Experimental Studies ◽  
Local Flow ◽  
Structured Packing ◽  
Film Spreading

Results of experimental studies on hydrodynamics of the film flow of liquid nitrogen over the surface of the single elements of structured packing are presented. The effect of inclination angle of the large ribs and perforation on the zones of liquid film spreading over the corrugated surface with microtexture at different Reynolds numbers of the film is shown based on a comparison of experimental data. It is shown that the angle of large rib inclination has a significant influence on redistribution of the local flow rate of liquid flowing on the surface with complex geometry. Analysis of results of the high-speed video revealed that in a vicinity of the vertical lateral edges of corrugated plates, the intense rivulet flows are formed, including those with separation from the film flow surface. This negative factor can lead to significant liquid accumulation and flow near the vertical edges of the structured packing and on the inner wall of the heat exchanging apparatuses and, finally, to a significant increase in the degree of maldistribution of local liquid flow rate over the crosssection, for instance, of the distillation columns.

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