摘要:

A semi-empirical correlation which fits quite well to most of the published data on the solubility of gases in lubricants is presented. Helium, hydrogen, nitrogen, air, and oxygen are well supported. Carbon dioxide is well supported in hydrocarbons but not in esters or silicones. Reactive gases such as HCl, SO2and NH3are excluded, as are hydroxy liquids. Other gases (Ne, CO, Ar, CH4, and Kr) are included by analogy with their solubility in pure fuel hydrocarbons. The overall standard error of estimate was 21 percent. The correlation is based on ASTM D 2779 procedure, modified to include the Hildebrand solubility parameter. Means for estimating the parameter from lubricant density, refractive index or chemical structure are given.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982977

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Fluorohydrocarbon elastomers are well known for their resistance to heat and fluids. However, certain additive packages in lubricating oils have been found to have a deleterious effect on the properties of these rubbers. Consequently, a study was undertaken to determine the effect of oil additive on the properties of fluorohydrocarbon rubbers under total immersion conditions. Most of the tests were conducted at 163°C to accelerate the effects that might be observed under normal automotive operating temperatures. Performance was based on the change in elongation, degree of crazing and volume increase.

ISSN:0569-8197    

DOI:10.1080/05698198008982978

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Stiffness, damping and rigid rotor stability curves are presented for 13, finite-step (pressure dam), journal bearings of different geometries. Step inertia effects are neglected, but the axial and circumferential effects of turbulence over the entire bearing surface are included. Experimental results are compared to a theoretical stability analysis for a single-mass, flexible rotor. Good correlation is obtained between the predicted theoretical stability threshold speed and the experimental threshold speed for three test cases.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982979

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The unbalance response and stability of a simple flexible rotor was tested over a speed range with three different types of journal bearings: axial groove, pressure dam and tilting pad. Measurements were made of total rotor response, synchronous response and frequency spectrums at various running speeds and at selected locations along the shaft. Axial groove bearings were better for low-speed use and near the critical speed but oil whip occurred at approximately twice the first rotor critical speed. Two sets of pressure dam bearings with different geometries were tested and both controlled vibrations at the critical speed. Whip occurred at twice and thrice the critical speed for the two pressure dam bearings. Tilting-pad beatings exhibited large vibration amplitudes near the critical speed, but did not go into oil whip at speeds up to three times the first rotor critical speed.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982980

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The measured heat of adsorption for the oleophilic rust inhibitor sodium dinonylnaphthalenesulfonate, at the iron oxidelcyclohexane interface was found, to be 42.3 Kj/mole at. 30°C. In systems containing trace amounts of water, the measured heat of adsorption was found to decrease with increasing water concentration. An investigation of the effect of water on sulfonate adsorption indicated that (1) a complex equilibrium involving adsorbed and micellar water exists and (2) water penetration of a sulfonate monolayer is a facile process. These findings contradict this laboratory's earlier suggestion of a barrier type mechanism and indicate the importance of bulk fluid adsorption to form a mixed monolayer in the mechanism of rust protection.

ISSN:0569-8197    

DOI:10.1080/05698198008982981

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

A mixed friction model is presented for the mechanical face seal. The model considers load sharing between mechanical and fluid hydrostatic pressures and the friction that results. Thermal rotation resulting from friction heating is included. Equilibrium solutions are presented which show a strong influence of thermal rotation on initial seal performance. A wear model shows that seal faces wear parallel after a period of steady operation in spite of initial taper. The model can be used to simulate seal performance over a period of time and under variable operating conditions.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982982

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Since the advent, of railways, the main work in lubrication has been towards understanding the formation of the oil film. The emphasis is now changing. Interest, is concentrated on film breakdown. While hydrodynamic theory can calculate the film thickness between surfaces, it cannot predict the critical, oil-film thickness for failure. This is the task of surface chemistry and metallurgy. In this paper, the factors involved in failure are described, in particular the importance of physisorption and chemical reaction, or chemisorption, is emphasized. A mechanism of scuffing based, on the residence time of molecules is advanced.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982983

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Component deformations have a significant effect on performance of high-pressure, end-face seals. Deflection analysis is necessary for prediction, control and understanding, but is often complicated by existing arrangements of support for seal faces. The common commercial design for both a stationary and a rotating seal face is the two-component assembly.

ISSN:0569-8197    

DOI:10.1080/05698198008982984

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

An interest in the wear of steel nonsteel systems, currently in use in aircraft fuel systems, has led to a study of aluminum bronze sliding on KE961 steel in the presence of kerosene with, and without, the addition of a commercial boundary lubricant. Experiments were conducted to determine wear rates with change of load together with an extensive investigation of the contacting surfaces using physical techniques such as EPMA, SEM and Auger spectroscopy.

ISSN:0569-8197    

DOI:10.1080/05698198008982985

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

A single correlation was obtained to predict Newtonian viscosity-pressure coefficients of mineral oils, resin and polymer blends, pure hydrocarbons, and nonhydrocarbons. The correlation has been tested for a temperature range from 0°c (32 °F) to 135°C (275 °F). The empirical correlation makes use of atmospheric viscosity and density at the temperature of interest and viscosity-temperature property (mo) of the fluids. When the correlation was compared with other leading correlations, it was shown to require less physical-property data, apply to n wider range of chemical compositions, cover a wider range in fluidity, and provide greater accuracy. The correlation is presented in the form of a polynominal equation.Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May 3, 1979

ISSN:0569-8197    

DOI:10.1080/05698198008982986

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor