Calculation of Penetrant Testing Sensibility for Powder Developer

Prokhorenko, P. P.; Migoun, N. P.

doi:10.1016/b978-0-08-036221-2.50071-1

Cited by 5 publications

(8 citation statements)

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“…2 show that for every fluid beginning from a certain gap height, the load capacity calculated using the micropolar fluid model is larger than the one calculated with the classical Newtonian model of the fluid. More importantly, it [25], the oefficients were calculated and are listed in Table 1.…”

Section: Load Carrying Capacity the Load Comparison Parameter S(h)mentioning

confidence: 99%

“…In [25,26], a method to experimentally determine the parameters characterizing the microstructure of a liquid is proposed. Formulae for the calculation of micropolar viscosity coefficients from the micropolar parameters are given, and the values of the micropolar parameters for water and exemplifying fluids used in defectoscopy are listed.…”

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

“…Values of experimentally determined micropolar fluid constants for water and the fluids used in defectoscopy [25,26], and values predicted for water [18] based on molecular dynamic simulations are used in this work. In [25,26], a method to experimentally determine the parameters characterizing the microstructure of a liquid is proposed.…”

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

“…To perform the calculations, we assume that α o = 0.2. For water and the three fluids, P1, P2 and P3, as denoted in [25], the coefficients were calculated and are listed in Table 1. In the last row of Table 1, the values for water at 16°C are listed, which were evaluated by Hansen et al [18] using equilibrium molecular dynamics.…”

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

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Squeeze flow modeling with the use of micropolar fluid theory

Kucaba-Pietal

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The aim of this paper is to study the applicability of micropolar fluid theory to modeling and to calculating tribological squeeze flow characteristics depending on the geometrical dimension of the flow field. Based on analytical solutions in the lubrication regime of squeeze flow between parallel plates, calculations of the load capacity and time required to squeeze the film are performed and compared -as a function of the distance between the plates -for both fluid models: the micropolar model and the Newtonian model. In particular, maximum distance between the plates for which the micropolar effects of the fluid become significant will be established. Values of rheological constants of the fluids, both those experimentally determined and predicted by means of using equilibrium molecular dynamics, have been used in the calculations. The same analysis was performed as a function of dimensionless microstructural parameters. MFT is being widely developed due to its potential use in tribology, microdevices, biotribology, and magnetorheology, to describe the flows in microchannels [10][11][12]. For the past twenty years, significant progress and results supporting the usefulness of MFT to model fluid flow in narrow gaps and passages have been developed. Based on the molecular dynamics method, it was confirmed that during the Poiseuille flow in very narrow channels, the microrotation velocity -not included in the classical continuum theory -does in fact exist and those results are sufficiently consistent with the results obtained based on the analytical solution of the micropolar fluid flow [13][14][15][16][17]. A new method has been developed by Hansen et al. [18] for designating the micropolar viscosity coefficients for real fluids using equilibrium molecular dynamics and values for water have been presented in the same work.Research on scale effect of MFT applicability to microflows modeling started in 2004. It showed that micropolar fluid equations of motion are being reduced to their counterparts in the classical continuum medium (Cauchy) theory, i.e. the Navier-Stokes equations, when the characteristic linear dimension of the flow field is sufficiently large [15,16]. As a result, questions concerning the size of the flow field arose as concerns the effective use of MFT in solving flow problems. HagenPoiseuille fluid flow in this context was studied in detail [16] and a microchannel maximum diameter value, above which the effect of micropolarity is negligibly small, was calculated for some real fluids, including water and blood, and expressed in dimensionless micropolar parameters. Hoffmann et al. (2007) compared the resistance force exerted on a sphere moving in micropolar fluids: water and blood, and showed that deviations are being observed only for small sphere radii.Lubrication-type analysis for squeezing flow is well established, and physical effects such as increased load capacity, etc., have been known since the 1970s, quoted e.g. in [3,4]. The increasing number of articles regarding squeez...

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Section: Load Carrying Capacity the Load Comparison Parameter S(h)mentioning

confidence: 99%

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

Section: Data Used For Squeeze Film Characteristics Calculationmentioning

confidence: 99%

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Squeeze flow modeling with the use of micropolar fluid theory

Kucaba-Pietal

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…Flow characteristics are determined. Values of experimentally determined micropolar fluid constants [4] and values predicted on molecular dynamic simulations [5] are used in the calculations. Formulas for the maximal distance between plates for the squeezing flow and the maximal cross-sectional size of the channel for the Hagen-Poiseuille flow, for which the micropolar effects of the fluid affects flow characteristics are established and their values for some real fluids are calculated.…”

Section: Introductionmentioning

confidence: 99%

Scale Effect in Microflows Modelling With the Micropolar Fluid Theory

Kucaba-Pietal¹

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The aim of this paper is to perform a comparative study of the scale effect on the applicability of the theory of micropolar fluids to microflows modelling. Flows which often appear in microfluidics systems: the squeezing flow between flat plates and the HagenPoiseuille flow are considered. For each flow the maximal geometrical dimension of the flow field for which the "micropolar ity" of the fluid affects flows characteristics is predicted and its value is calculated for water, blood and electro-rheological suspension. Results indicate that for the Hagen-Poiseuille flow the dimension is ten times greater than for the squeezing flow. 7948A. Kucaba-Piętal

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State of the Art and Short Term Development Tendencies in Nondestructive Surface Defect Detection and Evaluation

Goebbels

1989

Non-Destructive Testing

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Calculation of Penetrant Testing Sensibility for Powder Developer

Cited by 5 publications

References 0 publications

Squeeze flow modeling with the use of micropolar fluid theory

Squeeze flow modeling with the use of micropolar fluid theory

Scale Effect in Microflows Modelling With the Micropolar Fluid Theory

State of the Art and Short Term Development Tendencies in Nondestructive Surface Defect Detection and Evaluation

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