On the Prediction of Cavitation in Dimples Using a Mass-Conservative Algorithm

Qiu, Yibin; Khonsari, M. M.

doi:10.1115/1.3176994

Cited by 180 publications

(105 citation statements)

References 15 publications

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“…Some researchers have investigated the load-carrying capacity using ring-on-ring test rigs, for which the periodic boundary condition is adequate [1-4, 6-8, 11, 12]. Khonsari's group [6,12,26,27], Zhang et al [8], and Cross et al [11] have also theoretically estimated the positive load-carrying capacity using the JFO theory for the periodic boundary condition. However, the magnitude of the load-carrying capacity seems to be too small to cause improvement in the lubrication characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…The validity of the load-carrying capacity arising from the micro wedge action seems doubtful because the significant low load-carrying capacity has been determined [25,26], taking into account the mass conservation of flow between the cavitation zone and the pressure-developed zone. Therefore, the present study focuses on quantifying the extent of the load-carrying capacity enabled by the micro wedge action.…”

Section: Introductionmentioning

confidence: 99%

“…Following the development of the Elrod algorithm, several researchers revised the algorithm and used it in their studies [23,24]. Ausas et al [25] and Qiu and Khonsari [26] used the Elrod algorithm to compare the load-carrying capacity determined using the Reynolds boundary condition to that determined using the JFO theory. It was found that the load-carrying capacity is overestimated when the Reynolds boundary condition is used to consider the cavitation zone.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Magnitude of Load-Carrying Capacity of Textured Surfaces in Hydrodynamic Lubrication

2015

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This paper investigates the magnitude of the load-carrying capacity enabled by textured feature in hydrodynamic lubrication. The numerical model is a two-dimensional fixed pad bearing with a single dimple. The Reynolds equation was numerically solved using the Elrod algorithm. Two boundary conditions at the inlet and outlet were compared: a periodic boundary condition and an atmospheric boundary condition. The load-carrying capacity for the atmospheric boundary condition is negative while that for the periodic boundary condition is positive when a dimple is located at the centre of the lubricated area. The atmospheric boundary condition, when a dimple is located on the inlet side and is opened to the outside, exhibits greater load-carrying capacity than that in the enclosed dimple case.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Magnitude of Load-Carrying Capacity of Textured Surfaces in Hydrodynamic Lubrication

2015

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“…The lateral force is obtained by integrating the vertical components of the pressure over the spool surface, as shown in Eq. (17). The decrease in the absolute value of the lateral force can be related to the relief of the uneven pressure distribution surrounding the spool.…”

Section: Numerical Model and Numerical Methodsmentioning

confidence: 99%

The validity of the Reynolds equation in spool valve analysis considering cavitation

Hong

Kim

2016

Friction

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Abstract:The purpose of this research is to investigate the validity of the Reynolds equation in spool valve analysis under cavitation. This study is carried out for a laminar and isothermal flow between a sleeve and spool with grooves. The pressure and lateral force obtained from the Reynolds equation and the Navier-Stokes equation are compared with variations of aspect ratio, cross sectional area, and number of grooves. The cavitation phenomenon is considered by using a cavitation model in the Navier-Stokes equation and the Reynolds cavitation boundary condition in the Reynolds equation. A large difference of more than 20% is found between the equations for a lateral force of spool valve with many grooves. It was found that the Reynolds equation is not suitable for calculation of a lateral force of the spool valve with multiple-grooves of which the width and depth are even larger than the clearance under cavitation.

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“…To validate the present algorithm, a comparison was conducted according to a classic journal bearing in (Elrod, 1981) and a seal face with one dimple in (Qiu and Khonsari, 2009), which are shown in Fig. 2 and Fig.…”

Section: Validationsmentioning

confidence: 99%

An efficient adaptive finite element method algorithm with mass conservation for analysis of liquid face seals

Meng

Bai

Peng

2014

J. Zheijang Univ.-Sci.

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Abstract:To improve lubrication effect and seal performance, complicated geometrical hydrodynamic grooves or patterns are often processed on end faces of liquid lubricated mechanical seals. These structures can lead to difficulties in precisely estimating the seal performance. In this study, an efficient adaptive finite element method (FEM) algorithm with mass conservation was presented, in which a streamline upwind/Petrov-Galerkin (SUPG) weighted residual FEM and a fast iteration algorithm were applied to solve the lubrication equations (Reynolds equation). A mesh adaptation technique was utilized to refine the computation domain based on a residual posterior error estimator. Validation, applicability, and efficiency were verified by comparison among different algorithms and by case studies on seals' faces with different groove structures. The study investigated the influence of the order of shape function and the mesh number on the leakage balance. Mesh refinement occurred mainly in cavitation zones when cavitation happened, otherwise it occurred in regions with a high pressure gradient. Numerical experiments verified that the proposed algorithm is a fast, effective, and accurate method to simulate lubrication problems in the engineering field apart from end face seals.

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On the Prediction of Cavitation in Dimples Using a Mass-Conservative Algorithm

Cited by 180 publications

References 15 publications

On the Magnitude of Load-Carrying Capacity of Textured Surfaces in Hydrodynamic Lubrication

On the Magnitude of Load-Carrying Capacity of Textured Surfaces in Hydrodynamic Lubrication

The validity of the Reynolds equation in spool valve analysis considering cavitation

An efficient adaptive finite element method algorithm with mass conservation for analysis of liquid face seals

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