New Mini-Rotary Viscometer Temperature Profiles That Predict Engine Oil Pumpability

Henderson, Kenneth O.; Manning, Robert E.; May, CJ; Rhodes, RB

doi:10.4271/850443

Cited by 33 publications

(4 citation statements)

References 4 publications

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“…round of research to determine why the MRV test method was inadequate. (24)(25)(26)(27)(28)(29)(30)(31) The sensitivity of some oils to cool-down rate was found to be the reason for the failure of the MRV test to identify oils with poor low-temperature performance. (24)(25)(26)3) In 1987, MacAlpine and May reported that basestock pour points or residual wax contents% alone do not predict low-shear viscometric properties of formulated engine oils under slow-cool conditions.…”

Section: B Background -mentioning

confidence: 99%

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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Contract No. DAAK70-87-C-0043 AUG 2 31988 ! ' Approved for public release; distrioution unlimited H D~cernber 1987 07% % = Disclaimers The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. Trade names cited in this report do not constitute an official endorsement or approval of the use of such commercial hardware or software.

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Section: B Background -mentioning

confidence: 99%

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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“…Oil rheology after yield is often highly non-Newtonian, exhibiting strong time- and stress- (shear thinning) dependent behavior. Occurrences of these phenomena have been documented for both mineral − and crude − oils.…”

Section: Introductionmentioning

confidence: 99%

“…How the process of wax crystallization leads to oil gelation and then how the modulus and yield properties of the structural network that develops are related to the process of wax crystallization, i.e., the time, stress, and temperature history dependencies, are of particular practical and fundamental interest to lubricant and petroleum industries. With regard to lubricants, understanding these behaviors gives insight into how oil composition determines the amount of crystallized wax − and how the time-, stress-, and temperature-history-dependent flow properties and yielding behavior of the wax crystal structure depend on the wax crystallization process. ,,− These issues are also particularly pertinent to understanding how conditions utilized in lubricant performance tests impact the understanding of how lubricants perform under a broad range of naturally encountered conditions. − …”

Section: Introductionmentioning

confidence: 99%

Yield Properties of Wax Crystal Structures Formed in Lubricant Mineral Oils

Webber¹

2000

Ind. Eng. Chem. Res.

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On being cooled to temperatures well below the onset temperature for wax crystallization, mineral oils undergo a transition from viscous to elastic-solid (G‘ ≫ G‘ ‘) behavior, referred to as gelation. Gelation is caused by the formation of a wax crystal network and is distinct from a glass transition. We investigate the yield behavior of gelled mineral oils, linear elastic and fracture yield limits, as a function of the amount of crystallized wax and the particle size distribution of the wax by studying yield behavior as a function of temperature. By cooling the mineral oils at different constant cooling rates, we altered the surface-area-average crystal length (l s) in the wax crystal network. The observed yield behavior is compared to that reported for gels formed from flocculated or aggregated colloidal particles; gelled mineral oils exhibit a weak-link type of scaling in contrast to the strong-link scaling exhibited by flocculated colloidal gels.

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“…C. This cooling profile is often referred to as TP-1 and is the critical aspect of this test. It was determined after investigation of climatic data from various geographical locations during field pumpability failures in Northern USA during the winter of 1981/82 [6]. ASTM D4684 replaces the earlier pumpability test ASTM D3829 which failed to predict the 1981 winter field pumpability failures despite having an already quite lengthy16 hour cooling profile [7], [8], [9].…”

Section: Historical Context To Current Engine Oil Low Temperature Reqmentioning

confidence: 99%