Effect of oil quality on electrostatic charge generation and transport

Harvey, Terry J.; Wood, R.J.K.; Denuault, Guy; Powrie, H.E.G.

doi:10.1016/s0304-3886(01)00180-2

Cited by 65 publications

(34 citation statements)

References 33 publications

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“…Indeed the tribocharging in liquids can be due to the relative motion between the fluid and the solid interface [4,15,16]. The charged metal surface attracts opposite charges and repels like charges.…”

Section: About Possible Mechanismsmentioning

confidence: 99%

Electrical charging during the sharkskin instability of a metallocene melt

Tonon

Lavernhe-Gerbier

Flores

et al. 2005

Journal of Non-Newtonian Fluid Mechanics

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Flow instabilities are widely studied because of their economical and theoretical interest, however few results have been published about the polymer electrification during the extrusion. Nevertheless the generation of the electrical charges is characteristic of the interaction between the polymer melt and the die walls. In our study, the capillary extrusion of a metallocene polyethylene (mPE) through a tungsten carbide die is characterized through accurate electrical measurements thanks a Faraday pail. No significant charges are observed since the extrudate surface remains smooth. However, as soon as the sharkskin distortion appears, measurable charges are collected (around 5 10 -8 C/m 2 ). Higher level of charges are measured during the spurt or the gross-melt fracture (g.m.f) defects. This work is focused on the electrical charging during the sharkskin instability. The variation of the electrical charges versus the apparent wall shear stress is investigated for different die geometries. This curve exhibits a linear increase, followed by a sudden growth just before the onset of the spurt instability. This abrupt charging corresponds also to the end of the sharkskin instability. It is 2 also well-known that wall slip appears just at the same time, with smaller velocity values than during spurt flow. Our results indicate that electrification could be a signature of the wall slip.We show also that the electrification curves can be shifted according to the time-temperature superposition principle, leading to the conclusion that molecular features of the polymer are also involved in this process.

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Section: About Possible Mechanismsmentioning

confidence: 99%

Electrical charging during the sharkskin instability of a metallocene melt

Tonon

Lavernhe-Gerbier

Flores

et al. 2005

Journal of Non-Newtonian Fluid Mechanics

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“…Wear is the most common type of mechanical [ 34,67,94,96] showed the sensing capabilities of the electrostatic monitoring technology for both oil-line and wear-site debris in one monitoring suite by utilizing an accelerated bearing failure test under both overloaded and seeded fault conditions.…”

Section: Wear Debris Detection In Lubrication Oilmentioning

confidence: 99%

“…That these terminologies and ad hoc methods have been presented in a variety of scientific, mechanical engineering, material engineering and other publications, shows that the use of electrostatic monitoring is currently being investigated in a number of areas, such as condition monitoring for aero-engine gas path [4,12,14,[25][26][27][28][29][30][31], lubrication oil wear debris detecting [32][33][34][35] , bearing wear monitoring [36][37][38][39] and flow measurement [40], rotational speed measurement [41] and particle size measurement [42], to name a few. However, it is apparent that much more research is needed into this technology, as will be discussed in the final section of this paper.…”

Section: Introductionmentioning

confidence: 99%

A review of electrostatic monitoring technology: The state of the art and future research directions

Zhang

Hou

Atkin

2017

Progress in Aerospace Sciences

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Electrostatic monitoring technology is a useful tool for monitoring and detecting component faults and degradation, which is necessary for system health management. It encompasses three key research areas: sensor technology; signal detection, processing and feature extraction; and verification experimentation. It has received considerable recent attention for condition monitoring due to its ability to provide warning information and non-obstructive measurements on-line. A number of papers in recent years have covered specific aspects of the technology, including sensor design optimization, sensor characteristic analysis, signal de-noising and practical applications of the technology. This paper provides a review of the recent research and of the development of electrostatic monitoring technology, with a primary emphasis on its application for the aero-engine gas path. The paper also presents a summary of some of the current applications of electrostatic monitoring technology in other industries, before concluding with a brief discussion of the current research situation and possible future challenges and research gaps in this field. The aim of this paper is to promote further research into this promising technology by increasing awareness of both the potential benefits of the technology and the current research gaps.

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“…The electrostatic (ES) sensing technique has shown promising results when identifying charges associated with surface and lubricant degradation mechanisms, such as contact potential difference (CPD) [17][18][19][20] , triboemission [21][22][23] and debris formation [24,25] , as well as identifying charges associated with the double layer effect [26] (lubricant-surface interaction). ES sensors have also shown to be able to detect bearing failures in advance of vibration monitoring techniques [27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

Esmaeili¹,

Harvey²,

White³

et al. 2018

int j cond monitor

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White etching cracks (WECs) have been found to form in rolling element bearings as early as 6-24 months into operation, especially in large wind turbine gearboxes [1] . [2,3] . [4] . [3] . To investigate the feasibility of WEC detection using the electrostatic (ES) sensing technique, an ES wear site sensor was installed on a bearing test-rig where WECs had been created under the influence of electrical load. The ES responses were compared with those from an acoustic emission (AE) sensor that had been shown to detect WEC failures in a previous study The physical findings related to WEC failures in the bearings and basic analysis of the sensor signals have been reported in a parallel paper by Zuercher et al

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Effect of oil quality on electrostatic charge generation and transport

Cited by 65 publications

References 33 publications

Electrical charging during the sharkskin instability of a metallocene melt

Electrical charging during the sharkskin instability of a metallocene melt

A review of electrostatic monitoring technology: The state of the art and future research directions

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

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