A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 2: Applications

Gustavsson, Mattias

doi:10.5541/ijot.5000075310

Cited by 2 publications

(10 citation statements)

References 14 publications

(54 reference statements)

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“…Example 4.) Adopting the concept of wear work -which arguably directly connects with wear -appears to explain several earlier unexplained phenomena, such as the particle-size dependency on ductile wear, further discussed in [15]. is not modelled or considered at all.)…”

Section: Fundamental Nature Of the Processesmentioning

confidence: 99%

“…comparisons [15] with Finnie-erosion- [2] and Archard [3] models. EXAMPLE 6: Earlier approaches to connect thermodynamics to wear (for closed systems) typically proposed a connection between entropy and "degradation" of the target object.…”

Section: Vol 18 (No 1) / 31mentioning

confidence: 99%

“…This boundary condition, Eq. (1), is used in Eulerian CFD flow solvers of multiphase flows, and is discussed further in [15].…”

Section: Length Scalesmentioning

confidence: 99%

“…open system + its surroundings, as a result of the irreversible residual sub-process, gives: (28) The quadratic relationship between wear rates and thermodynamic flow correlates well with extensive experiments (at high relative velocities) for ductile materials, cf. comparisons [15] with Finnie-erosion- [2] and Archard [3] models. EXAMPLE 6: Earlier approaches to connect thermodynamics to wear (for closed systems) typically proposed a connection between entropy and "degradation" of the target object.…”

Section: Residual Thermodynamic Analysismentioning

confidence: 99%

“…However, on the other hand, below it is argued that the wall friction work -an assumption that is validated in [15]. The residual irreversible work exerted by the exterior fluid element, transferred to the target surface, can be expanded by Eq.…”

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confidence: 99%

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A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 1: Theory

Gustavsson¹

2015

Int. J. Thermo

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An open-system irreversible thermodynamic analysis on inert wear and attrition is presented. The aim is to derive a theory which may be implemented in computational fluid dynamics flow solvers. In order to conduct analysis on the differential scale, it is shown that traditional macroscopic-scale concepts, earlier well-established in the literature, cannot be immediately applied. Hence, new differential concepts are introduced. It is argued that the overall analysis can be split up into sub-processes, where different types of specific sub-processes of wear and attrition may be extracted, and directly connected with the corresponding breakage or deformation of either ductile-or brittle-type target materials. Applying the residual thermodynamics framework, the new concepts of wear work and attrition work (at adiabatic conditions) can be defined, which typically only represent a small -often negligible -fraction of the total work.Keywords: Differential; residual; wear work; attrition work. Introduction 1.1 Scope of Present PaperTraditional "simple" wear models [1] work excellently for developing new wear-resistant materials and analyzing specific engineering wear problems (of fixed geometry).The traditional approach aims at analyzing apparent net wear in terms of experimental operating parameters as model input. For instance, Finnie's single-particle ductile erosion model [2] and Archard's empirical model [3] applied for ductile abrasion, are generally considered to represent well-proven models. In most situations, one may connect an empirical-or general black-box model to experiments.Since the end of 1980's, Eulerian Computational Fluid Dynamics (CFD) analysis on wear is attempted. The merits of a CFD analysis is discussed by e.g. [4][5][6][7][8][9][10][11][12][13][14].The utilization or implementation of a traditional wear model in a CFD flow solver, is not straightforward. The problem at hand is that a CFD solver models a number of variables on the grid-cell scale, providing local forces, mass-flows, and momentum-and energy balances. If applying a traditional wear model, locally in a grid cell, and reversing the analysis, it can be shown that the traditional wear model input variables (which are different than the variables simulated by a CFD flow solver), combined with knowledge on the experimental conditions at which the traditional wear model was originally developed, would translate into a different set of Eulerian local forces, massflows, and momentum-and energy balances, as the set computed by the CFD flow solver. Hence, at the same grid cell position, a double set of the same Eulerian variables exists, which hence, creates serious problems of physical inconsistency. Several cases of erratic implementations of traditional wear models in CFD solvers can be found in the literature -and is discussed below.

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Section: Fundamental Nature Of the Processesmentioning

confidence: 99%

Section: Vol 18 (No 1) / 31mentioning

confidence: 99%

“…This boundary condition, Eq. (1), is used in Eulerian CFD flow solvers of multiphase flows, and is discussed further in [15].…”

Section: Length Scalesmentioning

confidence: 99%

Section: Residual Thermodynamic Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 1: Theory

Gustavsson¹

2015

Int. J. Thermo

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A Residual Thermodynamic Analysis of Turbulence – Part 1: Theory

Gustavsson¹

2022

International Journal of Thermodynamics

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A new theoretical groundwork for the analysis of wall-bounded turbulent flows is offered, the application of which is presented in a parallel paper. First, it is proposed that the turbulence phenomenon is connected to the onset of an irreversible process – specifically the action of a slip flow – by which a new fundamental model can be derived. Fluid cells with specific dimensions – of length connected with the local slip length and thickness connected with the distance between two parallel slipping flows – can be hypothetically constructed, in which a specific kinetic energy dissipation can be considered to occur. Second, via a maximum entropy production process a self-organized grouping of cells occurs – which results in the distinct zones viscous sublayer, buffer layer, and the log-law region to be built up. It appears that the underlying web structure may take the form of either representing a perfect web structure without any visible swirls, or a partially defect web structure where unbalanced forces may result in the generation of apparent swirls – which in turn might grow into larger turbulent eddies. Third, on the transition from laminar to turbulent flows, a nominal connection between the onset of a turbulent wall boundary layer (in a pipe flow), the Reynolds number as well as the wall surface roughness can be derived.

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A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 2: Applications

Cited by 2 publications

References 14 publications

A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 1: Theory

A Residual Thermodynamic Analysis of Inert Wear and Attrition, Part 1: Theory

A Residual Thermodynamic Analysis of Turbulence – Part 1: Theory

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