On the boundary conditions in multi-phase flow through the piston ring-cylinder liner conjunction

Excessive piping vibration is a major cause of idleness, leaks, failures, fires and explosions in the petrochemical industry. One of the causes of vibration in piping is the occurrence of multiphase flow regimes, specially the one called slug flow. The main purpose of this work is the verification and improvement of a methodology for evaluation of excessive piping vibration caused by multiphase flow. This methodology is capable of generating, from the measured acceleration signals, forces equivalent to those induced by the two-phase flow. In other words, this methodology enables simplified models to represent adequately the dynamic structural behavior of the piping system when new boundary conditions are imposed, allowing to estimate the risk of failure in operation of piping system or to propose technically feasible solution to mitigate the vibration problem. A physical model made of acrylic pipes and PVC bends was assembled and used to measure, simultaneously, the accelerations at four points of this loop when subjected to multiphase flow and with two different boundary conditions. The methodology could therefore be applied, refined, and validated with the data obtained from the experiment and with the aid of numerical simulation.

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Analysis of Multi-Phase Flow Through Porous Media for Imbibition Phenomena by Using the LeNN-WOA-NM Algorithm

IEEE Access ◽

10.1109/access.2020.3034053 ◽

2020 ◽

Vol 8 ◽

pp. 196425-196458

Author(s):

Naveed Ahmad Khan ◽

Muhammad Sulaiman ◽

Abdulah Jeza Aljohani ◽

Poom Kumam ◽

Hussam Alrabaiah

Keyword(s):

Porous Media ◽

Phase Flow ◽

Flow Through Porous Media ◽

Multi Phase Flow ◽

Flow Through ◽

Multi Phase

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Numerical modelling and simulation of multi-phase flow through an industrial discharge chute

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.07.036 ◽

2017 ◽

Vol 125 ◽

pp. 937-950 ◽

Cited By ~ 3

Author(s):

Wendell de Queiróz Lamas ◽

Fabiano Fernandes Bargos ◽

Giorgio Eugenio Oscare Giacaglia ◽

Francisco José Grandinetti ◽

Leandro de Moura

Keyword(s):

Numerical Modelling ◽

Modelling And Simulation ◽

Phase Flow ◽

Industrial Discharge ◽

Multi Phase Flow ◽

Flow Through ◽

Multi Phase

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Modelling of transient flow of piston ring-liner contact using synthetic lubricants

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/13506501211050514 ◽

2021 ◽

pp. 135065012110505

Author(s):

Anastasios Zavos ◽

Pantelis G Nikolakopoulos

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Piston Ring ◽

Transient Flow ◽

Lower Boundary ◽

Phase Flow ◽

Asperity Contact ◽

Multi Phase Flow ◽

Multi Phase ◽

The Impact

The paper contains the results of the transient flow of piston ring conjunction of a single-cylinder motorbike engine. Calculations of piston ring forces, asperity contact and gas blow-by are determined in computational fluid dynamics. The stochastic model of Greenwood-Tripp approach is used to predict the load of asperities. The hydrodynamic friction is also calculated by means of computational fluid dynamics including the multi-phase flow through Rayleigh–Plesset equation and a discrete phase model for simulating nanoparticles interaction. The major contribution of this analysis is to specifically investigate the impact of the lubricant with additives and the corresponding transient effects such as hydrodynamic pressure, cavitation and lubricant film within the contact. The results indicate that to investigate realistic mechanisms of multi-phase flow in piston ring-liner contact, the contribution of nanoparticles should be matched with the type of lubricants. In addition, this advanced computational fluid dynamics model showed that nanoparticles motion is important in reciprocating line contacts, leading to lower boundary friction in the order of 8.8% than a simple model where cavitation and nanoparticles are ignored.

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