Research Papers: Hydrodynamic Lubrication

On Olsson's Interphase Condition in Cavitation Analysis

[+] Author and Article Information
Coda H. T. Pan

Global Technology,
Millbury, MA 01527
e-mail: panwrites1@aol.com

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 4, 2015; final manuscript received September 18, 2015; published online July 26, 2016. Assoc. Editor: Mircea Teodorescu.

J. Tribol 138(4), 041704 (Jul 26, 2016) (10 pages) Paper No: TRIB-15-1241; doi: 10.1115/1.4032912 History: Received July 04, 2015; Revised September 18, 2015

Olsson's interphase condition (OIC) is carefully examined and scrutinized with respect to both physical and mathematical implications. It is a genuine initial value problem statement so that its full compliance is mandatory for analyzing time-dependent cavitation problems in the journal bearing. Implementation of OIC must include: (1) an unambiguous description of the initial state of the entire fluid film of the bearing, (2) a realistic description of fluid supply configuration, (3) accurate determination of the locations of the void boundaries together with the corresponding pressure gradients, and (4) a suitable morphology model for the cavitated fluid. A new computation algorithm is proposed for cavitation studies that are governed by cross-boundary interface continuity (CBIC), which is a modified statement of OIC.

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Fig. 1

Alternative interpretations of striated void patterns. (a) Narrow oil strips model of Jakobsson and Floberg [7] as sketched in Braun and Hannon [13]. (b) Photographs after Dowson and Taylor [20] depicted as the model of two-component rupture front.

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Fig. 3

Half-cell divergence emulation for end-leakage calculation

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Fig. 2

Five-point centered divergence emulation schemes: (a) centered five-point emulation and (b) Christopherson algorithm

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Fig. 5

Void boundaries and peripheral flows, π-film and Pfeed=10−6

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Fig. 9

Profiles of Olsson parameters of π-film at incipience

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Fig. 8

Cavitated fluid at incipience

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Fig. 6

Characteristics of an end-fed bearing with moderate pressurization

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Fig. 7

Void-feeding flux profiles in 10× scale with Pfeed = 10−3

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Fig. 4

Comparison of π-film calculated by five- and nine-point emulation with (M=72,N=12)




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