Numerical analysis and simulations of the magnetic field and hydrophobicity effect on the journal bearing dynamics

Fialová, Simona; Pochylý, František; Malenovský, Eduard

doi:10.1177/1350650116662784

Cited by 3 publications

(5 citation statements)

References 22 publications

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“…Taylor number Ta [25,26] is a dimensionless quantity that characterizes the importance of centrifugal forces or so-called inertial forces due to the rotation of a fluid about an axis relative to the viscous forces.…”

Section: Ta a Re Numbermentioning

confidence: 99%

Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders

Kozubková¹,

Jablonská²,

Bojko³

et al. 2021

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This paper deals with a mathematical modeling of flow stability of Newtonian and non-Newtonian fluids in the gap between two concentric cylinders, one of which rotates. A typical feature of the flow is the formation of a vortex flow, so-called Taylor vortices. Vortex structures are affected by the speed of the rotating cylinder and the physical properties of the fluids, i.e., viscosity and density. Analogy in terms of viscosity is assumed for non-Newtonian and magnetorheological fluids. Mathematical models of laminar, transient and turbulent flow with constant viscosity and viscosity as a function of the deformation gradient were formulated and numerically solved to analyze the stability of single-phase flow. To verify them, a physical experiment was performed for Newtonian fluids using visualizations of vortex structures—Taylor vortices. Based on the agreement of selected numerical and physical results, the experience was used for numerical simulations of non-Newtonian magnetorheological fluid flow.

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Section: Ta a Re Numbermentioning

confidence: 99%

Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders

Kozubková¹,

Jablonská²,

Bojko³

et al. 2021

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“…The following article is focused on the research of Newtonian fluids, where the basic flow characteristics are verified on the basis of computational modeling and experiment. Due to the fact that flow instabilities penetrate at the interface of immiscible liquids, we decided to study the behavior of immiscible liquids in the area where another type of instability manifests itself, ie Taylor's vortex, because this issue is described in sufficient detail in [1,2,3,4,5].…”

Section: Introduction To the Issuementioning

confidence: 99%

Multiphase Flow in the Gap Between Two Rotating Cylinders

et al. 2020

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The research of liquids composed of two (or more) mutually immiscible components is a new emerging area. These liquids represent new materials, which can be utilized as lubricants, liquid seals or as fluid media in biomechanical devices. The investigation of the problem of immiscible liquids started some years ago and soon it was evident that it will have a great application potential. Recently, there has been an effort to use ferromagnetic or magnetorheological fluids in the construction of dumpers or journal bearings. Their advantage is a significant change in dynamic viscosity depending on magnetic induction. In combination with immiscible liquids, qualitatively new liquids can be developed for future technologies. In our case, immiscible fluids increase the dynamic properties of the journal hydrodynamic bearing. The article focuses on the stability of single-phase and subsequently multiphase flow of liquids in the gap between two concentric cylinders, one of which rotates. The aim of the analysis was to study the effect of viscosity and density on the stability/instability of the flow, which is manifested by Taylor vortices. Methods of experimental and mathematical analysis were used for the analysis in order to verify mathematical models of laminar and turbulent flow of immiscible liquids.

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“…The mechanical energy dissipation is greatly reduced in a journal bearing with hydrophobic surface due to the amplification of magnetic field. 40,41 Amanov et al. 42 investigated the effects of bulges adjacent to the dimples on the improvement in wear and friction at various loads and speeds.…”

Section: Introductionmentioning

confidence: 99%

“…Advancements in hydrophobic materials and layered surfaces allow surface-liquid interaction through slip conditions. Fialova´et al 40 presented mathematical models considering magnetic field and hydrophobia effects in Reynolds equation. The hydrophobic surface leads to higher Lorentz force due to significant effect on the velocity profile.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical energy dissipation is greatly reduced in a journal bearing with hydrophobic surface due to the amplification of magnetic field. 40,41 Amanov et al 42 investigated the effects of bulges adjacent to the dimples on the improvement in wear and friction at various loads and speeds. Fu et al 43 studied the effect of geometrical parameters on the hydrodynamic performance of laser surface textured donut-shaped bump parallel slider.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of magnetohydrodynamic partial slip laser bump texture slider and journal bearing

Rao

Rani

Mohamed

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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A model of magnetohydrodynamic partial slip laser texture bearing (slider and journal) is developed. The influence of laser bump texture and slip laser texture partial configuration on the magnetohydrodynamic performance analysis of bearing is presented. An electrically conducting fluid is confined to bearing surfaces under uniform magnetic field perpendicular to slider bearing and inclined to the line of maximum film thickness to journal bearing. A one-dimensional analysis based on the narrow groove theory is considered to evaluate the nondimensional pressure distribution in bearing. Results of the nondimensional load capacity and coefficient of friction of magnetohydrodynamic partial laser bump texture and partial slip laser texture bearing configurations are analyzed. Partial slip configuration under MHD lubrication without laser bump texture brings in the performance improvement.

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Numerical analysis and simulations of the magnetic field and hydrophobicity effect on the journal bearing dynamics

Cited by 3 publications

References 22 publications

Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders

Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders

Multiphase Flow in the Gap Between Two Rotating Cylinders

Analysis of magnetohydrodynamic partial slip laser bump texture slider and journal bearing

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