Flow and Stress Induced Cavitation in a Journal Bearing With Axial Throughput

Pereira, Anne G.; McGrath, G.; Joseph, Daniel D.

doi:10.1115/1.1387026

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Examples of stress-induced cavitation in extensional flow and shear flow were discussed by Joseph (1998). Pereira, McGrath & Joseph (2001) did a theoretical study of cavitation in a journal bearing with axial throughput. They found that the inception of cavitation in a moving fluid is always stress-induced.…”

Section: Introductionmentioning

confidence: 99%

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

et al. 2007

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The theory of stress-induced cavitation is applied here to the problem of cavitation of a viscous liquid in the streaming flow past a stationary sphere. This theory is a revision of the pressure theory which states that a flowing liquid will cavitate when and where the pressure drops below a cavitation threshold, or breaking strength, of the liquid. In the theory of stress-induced cavitation the liquid will cavitate when and where the maximum tensile stress exceeds the breaking strength of the liquid. For example, liquids at atmospheric pressure which cannot withstand tension will cavitate when and where additive tensile stresses due to motion exceed one atmosphere. A cavity will open in the direction of the maximum tensile stress, which is 45° from the plane of shearing in pure shear of a Newtonian fluid. This maximum tension criterion is applied here to analyse the onset of cavitation for the irrotational motion of a viscous fluid, the special case imposed by the limit of very low Reynolds numbers and the fluid flow obtained from the numerical solution of the Navier–Stokes equations. The analysis leads to a dimensionless expression for the maximum tensile stress as a function of position which depends on the cavitation and Reynolds numbers. The main conclusion is that at a fixed cavitation number the extent of the region of flow at risk to cavitation increases as the Reynolds number decreases. This prediction that more viscous liquids at a fixed cavitation number are at greater risk of cavitation seems not to be addressed, affirmed nor denied, in the cavitation literature known to us.

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Section: Introductionmentioning

confidence: 99%

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

et al. 2007

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“…Cavitation could occur in polymer processing and lubrication applications where it has not been previously considered. In fact, Pereira et al15 demonstrated the effect of a PNSCC on cavitation in a journal bearing with axial throughput. A better understanding of the cavitation inception criterion will improve efforts at inhibiting cavitation when it is not desired, or ensuring cavitation when it is desirable.…”

Section: Introductionmentioning

confidence: 99%

Cavitation in creeping shear flows

2005

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“…[3], [4], [5], [13], and [14]. They are a set of sufficient conditions to provide a unique solution for the system performance: the pressure distributions P 1 = P 2 = P 3 , P 4 and the flow distributions…”

Section: Analysis Of Multiple-channel Grease Lubricationmentioning

confidence: 99%

Grease Lubrication of a Multiple-Branch Mechanical System

Shih

Cheng

Grace

2005

Tribology Transactions

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Greasing is the preferred lubrication method in many mechanical devices. To simplify the design, some systems use multiple branches so that the grease must go through channels or different restrictions to reach target spots. Conceptually, flow restriction can be included in the design to achieve optimal grease distribution, but the detailed design can be complicated. For example, appropriate dimensions of various machine elements and their manufacturing tolerances must be considered along with the property of the grease, its feeding device, and its seal design. Currently, grease-feeding design relies heavily on experimental tests. A system-level modeling and analysis is desirable to understand the sensitivity of design parameters to the overall lubrication performance. In the study of grease lubrication of a universal joint, we have developed a semi-empirical model to address this challenge. The model is found useful to provide design guidance. The methodology can be extended and applied to more complicated cases. Laboratory tests on grease flow rates were conducted for a number of design alternates. Based on these data, the functional relationship of an equivalent discharge coefficient and the system parameters can be determined. Charts generated by the analytical model provide designers with a convenient tool for making design decisions.

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Flow and Stress Induced Cavitation in a Journal Bearing With Axial Throughput

Cited by 4 publications

References 3 publications

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

Cavitation in creeping shear flows

Grease Lubrication of a Multiple-Branch Mechanical System

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