A Mixed Flow Model for Lubrication with Emulsions

Wilson, W. R. D.; Sakaguchi, Y.; Schmid, Steven R.

doi:10.1080/10402009408983327

Cited by 64 publications

(28 citation statements)

References 4 publications

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“…Results of these papers are used to validate the present mathematical model as can be seen in Table 2. 8 It is observed from the Table 2 that the results based on the present investigations are in good agreements with the experimental results of Azushima. However, deviation between the results of paper 18) and present work is due to the approximate energy equation adopted by the authors of reference 18) in their computations.…”

Section: Resultssupporting

confidence: 78%

“…These investigations yielded significant insight in the controlling of performance parameters through operating variables. Moreover, Wilson et al 8) , Saxena et al 9) , Wilson and Chang 10) , Hsu et al 11) , Lu et al 12) , Le and Sutcliffe 13) , Szeri and Wang 14) , and Yang and Lo 15) have presented very interesting works pertaining to isothermal studies either dealing with fully flooded or mixed lubricated cases of metal forming. The findings of these studies are mainly applicable for the low operating speeds (less than 5 m/s).…”

Section: Introductionmentioning

confidence: 99%

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Film Formation Analysis with Starvation in the Inlet Zone of Cold Rolling Interface at High Roll Speeds

Pandey²,

Nath

2009

Tribology Online

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For successful cold rolling operation at elevated operating conditions, the existence of desirable minimum film thickness at the roll-strip interface and awareness of its controlling by adjusting the process variables such as roll speed, reduction ratio, lubricant types, and roll cooling system etc. are essential. Moreover, the studies of the lubricant's starvation in the inlet zone and its influence on the film thickness at high roll speeds considering viscous shear heating effects are very important issues. Thus, the objectives of this paper are to analyze the inlet zone of cold rolling interface thermohydrodynamically and develop formulas for the prediction of minimum film thickness (for both isothermal and thermal cases) as functions of operating parameters including levels of starvation. Based on the investigations reported herein, it is observed that the existence of starvation up to certain level seems to be beneficial. It causes reduction in the temperature rise in the inlet zone and reduces the quantity of lubricating oil (leading to oil conservation) required during the cold rolling operation provided a thin continuous film exists at the strip-roll interface. Authors believe that the cold rolling industries may be benefited by the formulas reported in this paper.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Film Formation Analysis with Starvation in the Inlet Zone of Cold Rolling Interface at High Roll Speeds

Pandey²,

Nath

2009

Tribology Online

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“…10. This theory was first proposed by Sakaguchi and Wilson [172] and later refined by Wilson et al [210] and independently developed by Kimura and Okada [112,113]. Cassarini et al [35] and Montmitonnet et al [135] have developed additional aspects of emulsion behavior based on this approach, including emulsion supply issues.…”

Section: Dynamic Concentrationmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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The growing awareness of environmental issues and the requirements to establish solutions diminishing the impact on working environment as well as external environment has initiated ever increasing efforts to develop new, environmentally benign tribological systems for metal forming. The present paper gives an overview of these efforts substituting environmentally hazardous lubricants in cold, warm and hot forging as well as sheet forming and punching/blanking by new, less harmful lubricants and furthermore describes other more generic measures directed towards the same goal such as development of anti-seizure tool materials and coatings and application of structured workpiece and tool surfaces.

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“…Textural attributes such as the grittiness and smoothness of microparticulate dispersions have been shown to depend on particle size, shape and elasticity (Guinard & Mazzucchelli, 1996;Singer & Dunn, 1990;Tyle, 1993). The lubrication behaviour of such systems is also strongly dependent on the particle size relative to the film thickness between tribological contacts (Wilson, Sakaguchi, & Schmid, 1994). It has been shown that soft hydrogel particles smaller than the film thickness or surface asperity height are entrained between the surfaces, whereas larger particles tend to be excluded from the contact zone (de Vicente, Stokes, & Spikes, 2006;Garrec & Norton, 2012).…”

Section: Introductionmentioning

confidence: 99%

Tribology of swollen starch granule suspensions from maize and potato

Zhang

Selway

Shelat

et al. 2017

Carbohydrate Polymers

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.1 | P a g e Highlights  tribology and rheology properties of cooked swollen starch granules (ghosts) characterised  maize granule ghost suspensions reduce friction compared to water  bell-shaped tribology curves due to particle entrainment for maize granule ghosts  limited friction reduction for potato ghosts due to break-up under tribological contact  potato granule ghost suspensions also break up under steady shear 2 | P a g e AbstractThe tribological properties of suspensions of cooked swollen starch granules are characterised for systems based on maize starch and potato starch. These systems are known as granule 'ghosts' due to the release (and removal) of polymer from their structure during cooking. Maize starch ghosts are less swollen than potato starch ghosts, resulting in a higher packing concentration and greater mechanical stability. In a soft-tribological contact, maize ghost suspensions reduce friction compared to the solvent (water), generate bell-shaped tribological profiles characteristic of particle entrainment and show a marked concentration dependence, whereas potato ghost suspensions exhibit lubrication behaviour similar to water. Microscopy analysis of the samples following tribological testing suggests that this is due to the rapid break-up of potato ghosts under the shear and rolling conditions within the tribological contact. A reduction in the small deformation moduli (associated with a weak gel structure) is also observed when the potato ghost suspensions are subjected to steady shear using parallel plate rheometry; both microscopy and particle size analysis show that this is accompanied by the partial shear-induced breakage of ghost particles. This interplay between particle microstructure and the resultant rheological and lubrication dynamics of starch ghost suspensions contributes to an enhanced mechanistic understanding of textural and other functional properties of cooked starches in food and other applications.

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A Mixed Flow Model for Lubrication with Emulsions

Cited by 64 publications

References 4 publications

Film Formation Analysis with Starvation in the Inlet Zone of Cold Rolling Interface at High Roll Speeds

Film Formation Analysis with Starvation in the Inlet Zone of Cold Rolling Interface at High Roll Speeds

Environmentally benign tribo-systems for metal forming

Tribology of swollen starch granule suspensions from maize and potato

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