摘要:

A critical examination of Constantinescu's theory of turbulent fluid film lubrication has been undertaken. Several of its anomalies were traced to violations of certain well-established basic phenomena in turbulent shear flows. A new approach, which is free of some of these objections, has been made. It holds promise of yielding a more consistent turbulent lubrication theory. Comparison is given on infinitely long bearing with Constantinescu's results.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972061

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The experimental and analytical literature is reviewed briefly and is drawn upon to provide solutions for the interactions of weak pressure flows with a strong Couette flow, as would be experienced in turbulent film bearings. In the pertinent derivations, care has been taken to avoid known pitfalls in the application of mixing-length theory. Insofar as is possible, the results are shown to be in accord with reported experimental measurements. The areas of uncertainty in these analyses are areas where further experimental measurements are called for.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972062

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

For sufficiently high speeds of the inner cylinder, the flow between concentric rotating cylinders with a circumferential pressure gradient is unstable. By considering the full nonlinear equations, the amplitude of the resulting vortex motion is computed. The effect of the vortex motion on the shear stress at the inner cylinder and the relation between the mean flow and the pressure gradient are discussed.Contributed to the American Society of Lubrication Engineers by the author.

ISSN:0569-8197    

DOI:10.1080/05698196408972063

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

A method for calculating spring and damping coefficients for the tilting-pad journal bearing is presented. The analysis includes the effect of pad inertia. Numerical results are given in form of design curves for the centrally pivoted 4-shoe, 5-shoe, 6-shoe, and 12-shoe journal bearing. A comparison with test results is included.

ISSN:0569-8197    

DOI:10.1080/05698196408972064

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

This paper deals with the effects of lubricant compressibility on the pressure profile and total load capacity in a partial journal bearing; pivot pressure as a measure of shoe load capacity; shoe friction characteristics; and optimum shoe clearnace ratios for various speeds. The parameter A is used as an indicator of the compressibility effect of gas in the bearing clearance.Contributed by the ASLE. Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society fo Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972065

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The work of several authors on the pressure depression effect in externally pressurized gas-lubricated bearings is presented, and improved mathematical formulas and experimental evidence are introduced. The use of the free surface, water table analogue as an aid in the visualization and study of the pressure-depression effect is presented. Good qualitative agreement was found between this analogue and the available experimental data.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972066

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Unlubricated, highly loaded sliding experiments were conducted for systems of mild steel, copper, aluminum, and zinc. Load is critical in determining the wear mode. A Cocks wedge mechanism is the primary method of wear for copper, and for aluminum until a critical temperature is reached. The wear of steel is characterized by the formation of small un-joined fragments.

ISSN:0569-8197    

DOI:10.1080/05698196408972067

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Measurements on the drainage of several mineral oils and a diester from vertical metal surfaces of different roughnesses have been carried out. Metals studied were low-carbon steel, aluminum, and silver-copper alloy (90 Ag-10 Cu). The method was adapted from one devised by Bikerman and applied by him to stainless steel, in which mineral oil retention by rough surfaces was compared with retention by smooth surfaces. High correlation has been obtained between surface roughness, as measured by a stylus instrument, and thickness of an apparently stagnant layer of oil. The correlation is highest when the roughness is measured in the direction of drainage. Equations for calculating the total thickness and volume of fluid retained by smooth surfaces have been reconfirmed.Contributed by the ASLE Technical Committee on Properties of Lubricants and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972068

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The preparation and preliminary evaluation of a number of trimeric and tetrameric bis (α, α, ω-tri H-polyfluoroalkyl) phosphonitrilates, mixed substituted trimeric and tetrameric (phenyl-α, α, ω-tri H-polyfluoroalkyl) phosphonitrilates, and mixed substituted trimeric and tetrameric (substituted phenyl-α, α, ω-tri H-polyfluoroalkyl) phosphonitrilates is described. Many products have wide liquid ranges with pour points ranging down to —55 F. They also have high compression ignition ratios and relatively high spontaneous ignition temperatures. Good wear, and compatibility with rubber are other favorable properties. In order to obtain hydrolytically stable products, new synthesis and purification methods were developed. The compounds are promising candidates for potential use as fire-resistant hydraulic fluids and lubricants.Contributed by the ASLE Technical Committee on Properties of Lubricants and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972069

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Alkylaryl- and alkylpolyethylenoxy phosphate ester acids and their salts were found to be effective load-carrying and rust-inhibiting additives for metalworking fluids. Falex and four-ball data showed that performance in oil, emulsion, and water systems were dependent upon the hydrophobe type and ethylene oxide content. Chip tests demonstrated that chemical composition also influenced rust inhibition.Contributed by the ASLE Fluids for Metalworking Committee and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972070

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor