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

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Tao Wang ◽  
Weifeng Huang ◽  
Ying Liu ◽  
Xiangfeng Liu ◽  
Yuming Wang
Keyword(s):  
Flow Field ◽  
Phase Change ◽  
Present Model ◽  
Phase Distribution ◽  
Liquid Fraction ◽  
Change Model ◽  
Mechanical Seal ◽  
Two Phase ◽  
3D Face ◽  
Face Structure

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.

Numerical model of two-phase mechanical face seal with shallow grooves based on finite volume method

2020 ◽  
Vol 72 (10) ◽  
pp. 1303-1309
Author(s):  
Wenbin Gao ◽  
Weifeng Huang ◽  
Tao Wang ◽  
Ying Liu ◽  
Zhihao Wang ◽  
...  
Keyword(s):  
Flow Field ◽  
Phase Change ◽  
Finite Volume Method ◽  
Peer Review ◽  
Finite Volume ◽  
Fluid Model ◽  
Mechanical Seal ◽  
Two Phase ◽  
Content Type ◽  
Volume Method

Purpose By modeling and analyzing the two-phase mechanical seal of the fan-shaped groove end face, which is prone to phase change, an effective method to study the flow field of the mechanical seal when both cavitation and boiling exist simultaneously is found. Design/methodology/approach Based on the finite volume method, a fluid model was developed to investigate a two-phase mechanical seal. The validity of the proposed model was verified by comparing with some classical models. Findings By modeling and analyzing the two-phase mechanical seal of the fan-shaped groove end face, which is prone to phase change, the analysis of the gap flow field of the mechanical seal was realized when cavitation and boiling existed simultaneously. Originality/value Based on the model proposed for different conditions, the pressure and phase states in the shallow groove sealing gap were compared. The phase change rate between the mechanical seal faces was also investigated. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2019-0537/

CFD simulation of air effect on flow field characteristics of hydro-viscous clutch with constant speed difference

2018 ◽  
Vol 19 (2) ◽  
pp. 208
Author(s):  
Xudong Zheng ◽  
Fangwei Xie ◽  
Diancheng Wu ◽  
Xinjian Guo ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Power Transmission ◽  
Volume Fraction ◽  
Phase Distribution ◽  
Constant Speed ◽  
Distribution Law ◽  
Two Phase ◽  
Oil Film ◽  
Speed Difference

The purpose of this paper is to study the air effects on transmission characteristics of hydro-viscous clutch and reveal the distribution law of the flow field of the oil film. The computational-fluid-dynamics (CFD) simulation model of oil film with radial oil grooves between friction pairs is taken as the study object. Considering the air effects, the pressure field, two-phase distribution, transmission torque and temperature field of the oil film are analyzed comparatively by using the CFD technology. The results show that the presence of air changes the pressure and temperature distributions of the oil film. With increase of the absolute rotational speed, the air volume fraction increases and the radius value of the air-liquid boundary decreases under condition of constant speed difference, which makes the coverage rate of the oil film on the surface of the friction disks reduce and the transmission torque of the oil film decrease. These simulation results are attributed to the study of hydro-viscous-drive and its applications. This paper also can provide a theoretical basis for the mechanism of power transmission through oil film in the presence of air effects.

scholarly journals Investigation of two-phase change flow in mechanical seal with complex solid surfaces

AIP Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 065210
Author(s):  
Jie Yang ◽  
Shuangfu Suo ◽  
Zhihao Wang ◽  
Aiming Wang ◽  
Guoying Meng
Keyword(s):  
Phase Change ◽  
Solid Surfaces ◽  
Mechanical Seal ◽  
Two Phase

The Effect of Droplet Solidification Upon Two-Phase Nozzle Flow

1971 ◽  
Vol 93 (4) ◽  
pp. 594-602
Author(s):  
P. N. Shankar
Keyword(s):  
Singular Perturbation ◽  
Phase Change ◽  
Liquid Fraction ◽  
Feedback Effect ◽  
Nozzle Flow ◽  
Phase Flow ◽  
Droplet Temperature ◽  
Two Phase ◽  
First Order ◽  
Perturbation Procedure

The handling of changes of phase in perturbation treatments of two-phase nozzle flow requires particular care. Droplet solidification, the phase change considered here, introduces two novel complications in a perturbation treatment of the problem. First, the boundaries of the zone of solidification are shifted by first-order corrections to the droplet temperature and liquid fraction, and these shifts introduce, in turn, further first-order corrections. This feedback effect is of particular interest and the magnitudes of the corrections are very significant. Second, a singular perturbation procedure is required to handle the problem at points where solidification first starts and where it is completed. The techniques presented here should be applicable to other problems involving phase change in two-phase flow.

The Boiling Interface in a Misaligned Two-Phase Mechanical Seal

1997 ◽  
Vol 119 (2) ◽  
pp. 265-271 ◽  
Author(s):  
I. Etsion ◽  
M. D. Pascovici ◽  
L. Burstein
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Approximate Solutions ◽  
Operating Conditions ◽  
Mechanical Seal ◽  
Two Phase ◽  
Iterative Solutions

The boiling interface in a misaligned two-phase mechanical seal is analyzed using a complete thermohydrodynamic approach that requires complex simultaneous iterative solutions of the nonaxisymmetric heat transfer and phase-change problems. It is shown that under certain operating conditions, characterized by a modified Sommerfeld number, several approximate solutions with various levels of simplification can be utilized to calculate the boiling radius.

Two-Phase Flow Field Characteristics Analysis on Seal Cavity for Bellows Mechanical Seal under Variable Operating Conditions

2012 ◽  
Vol 522 ◽  
pp. 436-440
Author(s):  
Li Chao Ren ◽  
Mutellip Ahmat ◽  
Qiang Gao ◽  
Jing Luo
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Optimization Design ◽  
Operating Conditions ◽  
Mechanical Seal ◽  
Two Phase ◽  
Cooling Effects ◽  
Two Phases ◽  
Two Phases Flow ◽  
Vapor Liquid

This research based on the vapor-liquid two-phases flow theory and methods, by using the CFD mix-multiphase flow model, the seal cavity vapor-liquid two-phases flow field for the bellows cartridge mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions was numerically simulated and analyzed, then the characteristics of the complex three-dimensional flow field of seal cavity caused by the rotation of the sealing ring were obtained by the different position of the injected coolant, and the different cooling effects were contrasted, then the best cooling position were found by analysis. The researching results provide a theoretical basis for the structural optimization design of the high parameters bellows cartridge mechanical seal devices.

A Pressure Pulse Model for Two-Phase Critical Flow and Sonic Velocity

1969 ◽  
Vol 91 (3) ◽  
pp. 371-381 ◽  
Author(s):  
F. J. Moody
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Present Model ◽  
Pressure Pulse ◽  
Critical Flow ◽  
Sonic Velocity ◽  
Phase Pattern ◽  
Two Phase ◽  
Theoretical Formulation ◽  
Pulse Transmission

Pressure pulse transmission in a flowing mixture provides the basis for a theoretical formulation of two-phase critical flow and sonic velocity. Homogeneous and separated phases are considered, showing that phase pattern plays an important role in pulse transmission. Graphs are presented for critical flow and sonic velocity of steam-water mixtures, based on no phase change or heat transfer across the pulse. The present model predicts most available data with homogeneous and separated phase patterns and suggests quality ranges for which each pattern applies.

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