Texture-induced cavitation bubbles and friction reduction in the Elrod–Adams model

Checo, Hugo; Jaramillo, Alfredo; Jai, Mohammed; Buscaglia, Gustavo C.

doi:10.1177/1350650114550012

Cited by 12 publications

(15 citation statements)

References 26 publications

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“…In addition, changing the threshold value for minimum lubricant fraction for shear forces to be transmitted from one surface to the other does not alter the behavior of the contact significantly. 46 Moreover, cavitation bubble at the trailing edge of the textured ring ( Figure 3) remains bigger than that for an untextured ring throughout the warm-up period. It indicates positive effect of cavitation-induced friction reduction in the textured ring-liner contact.…”

Section: Energy Lossmentioning

confidence: 89%

Modeling and simulation of frictional energy loss in mixed lubrication of a textured piston compression ring during warm-up of spark ignition engine

Ali

Park

2016

International Journal of Engine Research

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Road vehicles account for a substantial portion of energy consumed by transportation. A large amount of this energy is lost to overcome friction within vehicle engines, in which the piston compression rings are a major source of such parasitic losses. The internal losses of engines increase several times in the case of unfavorable warm-up conditions. Recent developments in surface modification showed promising results in improving the frictional behavior of piston rings. Analyses are often idealized, such as isothermal conditions and unrealistic engine operating conditions. This study presents a numerical investigation of the frictional behavior of mixed-hydrodynamic interaction in a textured piston compression ring-cylinder liner during the warm-up process. The transient Reynolds equation is solved with a massconserving cavitation algorithm, realistic oil rheology, and practical engine operating conditions. Several multigrade and monograde oils are considered to draw comprehensive conclusions. The results show that ring surface texturing substantially reduces energy loss during the entire warm-up phase.

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Section: Energy Lossmentioning

confidence: 89%

Modeling and simulation of frictional energy loss in mixed lubrication of a textured piston compression ring during warm-up of spark ignition engine

Ali

Park

2016

International Journal of Engine Research

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“…Furthermore, Medina et al took up the approach of a massconserving formulation of the Reynolds equation for steady-state lubrication and studied transient effects in lubricated textured bearings [46]. Checo et al [47] numerically studied the effect of transverse sinusoidal textures using the Elrod-Adams model. The texture was applied to the runner, and the bearing was assumed to be infinitely wide.…”

Section: Motivationmentioning

confidence: 99%

Analysis of the Velocity Distribution of an Elliptic Surface Structure Manufactured by Machine Hammer Peening

et al. 2015

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Machine hammer peening (MHP) is an incremental forming process for surface structuring of technical workpieces or tools. Currently, MHP strongly attracts the attention of automotive and toolmaking industry. Recently performed research showed improved tribological characteristics in lubricated deep drawing in terms of a reduced friction coefficient due to a lubricant pocket effect and a reduced contact area. In order to design the MHP process to obtain an optimized load capacity of the fluid film, the velocity distribution has to be analyzed. Thus, an analytic approach for solving the Reynolds equation as a valid simplification of the Navier-Stokes equations for an elliptic geometry of a MHP structure is proposed in this work. The research assumes stationary hydrodynamic lubrication and is restricted to the longitudinal properties. Thereby, the influence of the structure geometry, the fluid film thickness, the sliding velocity and the dynamic viscosity on the fluid velocity distribution is researched by means of an analytic solution of the Reynolds equation. The derived formula is applied to contribute to the understanding in lubricated deep drawing with MHP structures, but is also transferable on further sliding contacts, e.g. bearing lubrication.

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“…In fact, the bigger R/L, the bigger the set of textures that allows an improvement in friction and minimum clearance is. These results were recently published in [22], where a more extensive analysis can be found.…”

Section: General Observationsmentioning

confidence: 79%

“…Sincen is a normal unit vector pointing outward from some surface, the force f exerted by the fluid over it in the directionê is given by the projection of the total force f onê: 22) where the symmetry of τ was used in the last equality. The friction force is a force opposing the motion when an object is moved or two objects are relatively moving [88].…”

Section: Friction Forcesmentioning

confidence: 99%

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Modelação matemática de contatos lubrificados micro-texturizados

Palma¹

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Texture-induced cavitation bubbles and friction reduction in the Elrod–Adams model

Cited by 12 publications

References 26 publications

Modeling and simulation of frictional energy loss in mixed lubrication of a textured piston compression ring during warm-up of spark ignition engine

Modeling and simulation of frictional energy loss in mixed lubrication of a textured piston compression ring during warm-up of spark ignition engine

Analysis of the Velocity Distribution of an Elliptic Surface Structure Manufactured by Machine Hammer Peening

Modelação matemática de contatos lubrificados micro-texturizados

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