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Research Papers: Hydrodynamic Lubrication

A Homogeneous Phase Change Model for Two-Phase Mechanical Seals With Three-Dimensional Face Structures

[+] Author and Article Information
Tao Wang, Ying Liu, Xiangfeng Liu, Yuming Wang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China

Weifeng Huang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: huangwf@tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 29, 2014; final manuscript received July 7, 2014; published online August 4, 2014. Assoc. Editor: Luis San Andres.

J. Tribol 136(4), 041708 (Aug 04, 2014) (11 pages) Paper No: TRIB-14-1028; doi: 10.1115/1.4028043 History: Received January 29, 2014; Revised July 07, 2014

A homogenous phase change model (HPCM) based on the mass conservation law is proposed to analyze the flow field of a two-phase mechanical seal with 3D face structures. The two-phase flow domain is governed by the simultaneous partial differential equation set containing a mass transfer governing equation for each phase with a source term derived from the Rayleigh–Plesset model and a Reynolds equation for the mixture, where the pressure and the liquid fraction are unknowns. A numerical solution is developed based on finite element method (FEM). The results from the present model are in good agreement with those from the previous two-phase mechanical seal models. A two-phase mechanical seal with wavy-tilt-dam face structure is calculated. The results indicate that the 3D face structure affects the phase distribution by altering the film pressure field. The present model is especially useful to analyze the two-phase film flow field bounded by the complex solid surfaces.

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Figures

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Fig. 1

Schematic diagram of a mechanical seal

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Fig. 2

Flow chart of the numerical solution used in the HPCM

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Fig. 3

Pressure distributions calculated using the HPCM and DBM

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Fig. 4

Pressure distributions calculated using the HPCM and CBM

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Fig. 5

Configuration of the wavy-tilt-dam stator

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Fig. 6

Film thickness in a cycle of the wavy-tilt-dam stator

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Fig. 7

Schematic diagram of the structured mesh and boundary conditions

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Fig. 8

Phase distribution calculated for two-phase operating conditions

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Fig. 9

Distribution of phase change rate

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Fig. 10

Positional comparison between pressure contour and phase distribution

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Fig. 11

Pressure distribution

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Fig. 12

Three equidistant radial cut lines through the flow field

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Fig. 13

Pressure distributions on the three radial cut lines

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Fig. 14

Two-phase flow field on the cut line 2

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