Basic Relationships in Turbulent Lubrication and Their Extension to Include Thermal Effects

Constantinescu, V. N.

doi:10.1115/1.3451755

Cited by 69 publications

(38 citation statements)

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“…As can be seen, this curve falls within the range of values of k, determined from the pressure results. Comparison is also made with the predictions of Black and Walton (14), Constantinescu (15) and Hirs (16). Observation shows that, apart from the values of eccentricity of 0.3, the other theories predict much greater dependency on the local Reynolds number than that observed in the present work.…”

Section: Correlation Of the Transition Regime Resultsmentioning

confidence: 94%

An Experimental Investigation of Pressure Distributions in a Journal Bearing Operating in the Transition Regime

Roberts

Mason²

1986

Proceedings of the Institution of Mechanical Engineers, Part C:

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Experimental results are presented, relating to friction factors and circumferential pressure distributions, for a plain cylindrical ,journal bearing with a central circumferential inlet groove. The length-diameter ratio of each journal bearing land was 0.25 and the clearance ratio was 0.0031. The friction factor results showed the existence of a distinct 'transition regime', characterized by a pronounced 'hump' in the friction factor-Reynolds number relationship. Pressure measurements recorded when operating in this transition regime revealed the inadequacy of many existing 'turbulent' theories for superlaminar lubrication. By using a short-bearing theory a good correlation of the pressure distribution results was obtained, in terms of a non-dimensional viscosity parameter, k,, which is dependent on both the eccentricity ratio and Reynolds number. The magnitude of k, in this regime was considerably higher than the corresponding value for laminarflow, and was similar to the magnitude predicted.from a simple theory based on relating k , to the variation of measured friction factor with Reynolds number.

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Section: Correlation Of the Transition Regime Resultsmentioning

confidence: 94%

An Experimental Investigation of Pressure Distributions in a Journal Bearing Operating in the Transition Regime

Roberts

Mason²

1986

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The discontinuous steps in the Black and Walton curves occur at the critical Reynolds number (7) predicted by Taylor (19).…”

Section: Non-inertial Theorymentioning

confidence: 86%

The Characteristics of a Statically Loaded Journal Bearing with Superlaminar Flow

Hinton

Roberts

1980

Journal of Mechanical Engineering Science

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Experimental results are presented, relating to the friction factor, load capacity and attitude angle, for a plain, cylindrical journal bearing with a central, circumferential inlet groove. The length to diameter ratio of the journal bearing was 1/3 and the clearance ratio was 0.011. By the use of various lubricants, including water, Reynolds numbers ranging from 40 to 50 OOO were attained. Comparisons with various theoretical predictions are given. It is shown that a simple, empirical theory, which incorporates measured friction factors, gives better agreement with the experimental load capacity results than previous theories.

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“…The first and second spatial derivatives of U p , W p are obtained numerically and used in Eqs. (27)(28)(29)(30)(31)(32)(33) to find those of the inertia parameters, and flow rate in circumferential direction.…”

Section: Steady-state Operationmentioning

confidence: 99%

“…In this approach, the inertia effects are limited to changes in the magnitude of the lubricant average velocity. Constantinescu [26,29], Constantinescu and Galetuse [30,27], and Frene and Constantinescu [31,32] extended this model to include both turbulent and laminar regimes [27,30]. They used Prandtl's mixing length theory and divided the film thickness into near wall, and core regions to find the velocity profile.…”

Section: Introductionmentioning

confidence: 98%

An extended Reynold equation applicable to high reduced Reynolds number operation of journal bearings

Dousti¹,

Allaire²,

Dimond³

et al. 2016

Tribology International

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Basic Relationships in Turbulent Lubrication and Their Extension to Include Thermal Effects

Cited by 69 publications

References 0 publications

An Experimental Investigation of Pressure Distributions in a Journal Bearing Operating in the Transition Regime

An Experimental Investigation of Pressure Distributions in a Journal Bearing Operating in the Transition Regime

The Characteristics of a Statically Loaded Journal Bearing with Superlaminar Flow

An extended Reynold equation applicable to high reduced Reynolds number operation of journal bearings

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