Some rheological properties of plastic greases by Carreau-Yasuda model

Woźniak, Marek; Rylski, A.; Lasoń-Rydel, M.; Orczykowska, Magdalena; Obraniak, Andrzej; Siczek, Krzysztof

doi:10.1016/j.triboint.2023.108372

Cited by 11 publications

(6 citation statements)

References 51 publications

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“…The Carreau–Yasuda equation describes both pseudoplastic fluids at higher shear rates and Newtonian fluids at lower shear rates . The steady-state rate scan curve (Figure C) was well-fitted by the Carreau–Yasuda model ( R 2 > 0.99).…”

Section: Resultsmentioning

confidence: 76%

“…The Carreau−Yasuda equation describes both pseudoplastic fluids at higher shear rates and Newtonian fluids at lower shear rates. 52 The steady-state rate scan curve (Figure 2C) was wellfitted by the Carreau−Yasuda model (R 2 > 0.99). The power law constants (n) of all the measured samples were <1, suggesting that the samples were non-Newtonian fluids.…”

Section: Microstructures Of W/o Hipesmentioning

confidence: 87%

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Roles of NaCl in Enhancing the Stability of Water-in-Oil High Internal Phase Emulsions

Wei,

Chen,

Gao

et al. 2024

ACS Food Sci. Technol.

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This study constructed a novel method to develop ultrastable water-in-oil high internal phase emulsions (W/O HIPEs) by using polyglycerol polyricinoleate (PGPR) and NaCl. Microstructural observation demonstrated the formation of W/O HIPEs. The addition of NaCl significantly reduced the mean droplet diameter, resulting in denser and more uniform network structures. The textural and rheological analysis revealed that the W/O HIPEs conformed to the Carreau−Yasuda model (R 2 > 0.99) and behaved like a pseudoplastic fluid. The increment in PGPR (4−10 wt %) and NaCl (10−500 mM) significantly enhanced the storage modulus, zero shear viscosity, and deformation resistance of the emulsions. The addition of NaCl (10−500 mM) significantly improved the freeze−thawing stability of W/O HIPEs, with the water-holding capacity (WHC) increasing from 67 to 99% after three freeze−thawing cycles. In the meantime, the W/O HIPEs containing NaCl had good stability when heated at 70, 80, and 90 °C for 30 min, with a WHC of >95%. These findings demonstrated that the presence of NaCl was helpful in developing stable W/O HIPEs, further widening the applications of W/O systems.

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Section: Resultsmentioning

confidence: 76%

Section: Microstructures Of W/o Hipesmentioning

confidence: 87%

Roles of NaCl in Enhancing the Stability of Water-in-Oil High Internal Phase Emulsions

Wei,

Chen,

Gao

et al. 2024

ACS Food Sci. Technol.

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“…The uncertainties in viscosity results were 1% of the reported value. The viscosity data of SG, CMS-A, and CMS-B solutions exhibit a good fit [ 35 ] to the Carreau–Yasuda model [ 35 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

“…The viscosities of the fluids were measured in a DV 3 T viscometer (Brookfield Ametek, Middleborough, MA, USA) from 4.24 to 33.7 s −1 at 30, 60, and 80 • C. The uncertainties in viscosity results were 1% of the reported value. The viscosity data of SG, CMS-A, and CMS-B solutions exhibit a good fit [35] to the Carreau-Yasuda model [35,36].…”

Section: Viscosity Of the Sg Cms-a And Cms-b Solutionsmentioning

confidence: 96%

Carboxymethyl Scleroglucan Synthesized via O-Alkylation Reaction with Different Degrees of Substitution: Rheology and Thermal Stability

Castro,

Burgos,

Corredor

et al. 2024

Polymers

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This paper presents the methodology for synthesizing and characterizing two carboxymethyl EOR-grade Scleroglucans (CMS-A and CMS-B). An O-Alkylation reaction was used to insert a hydrophilic group (monochloroacetic acid—MCAA) into the biopolymer’s anhydroglucose subunits (AGUs). The effect of the degree of the carboxymethyl substitution on the rheology and thermal stability of the Scleroglucan (SG) was also evaluated. Simultaneous thermal analysis (STA/TGA-DSC), differential scanning calorimetry (DSC), X-ray Diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Scanning Electron Microscopy, and Energy Dispersive Spectroscopy (SEM/EDS) were employed to characterize both CMS products. FTIR analysis revealed characteristic peaks corresponding to the carboxymethyl functional groups, confirming the modification. Also, SEM analysis provided insights into the structural changes in the polysaccharide after the O-Alkylation reaction. TGA results showed that the carboxymethylation of SG lowered its dehydroxylation temperature but increased its thermal stability above 300 °C. The CMS products and SG exhibited a pseudoplastic behavior; however, lower shear viscosities and relaxation times were observed for the CMS products due to the breakage of the SG triple helix for the chemical modification. Despite the viscosity results, the modified Scleroglucans are promising candidates for developing new engineering materials for EOR processes.

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“…Son [17] also evaluated the life of ball‐bearing grease using formulae based on the relationship between temperature, speed, and load variations, which theoretically verified the reliability of the ball‐bearing grease life testing machine. Wozniak [18] tested three different commercial greases using greases commonly used in various rolling bearings. Based on the obtained dependence of apparent viscosity on shear rate, the parameters of the selected Carreau‐Yasuda rheological model were utilized to demonstrate that the rheological parameters of the three plastic greases studied were predicted very accurately.…”

Section: Introductionmentioning

confidence: 99%

Rheological characteristics and behaviour prediction of lubricating grease for RV reducer across a wide temperature range

Jiang,

Zhou,

et al. 2024

The Journal of Engineering

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Grease in the normal operation of the rotate vector (RV) reducer has a role that cannot be ignored, for the variable working conditions of the RV reducer, the performance of the lubricant changes directly affect its reliable operation. Therefore, the study of the rheological properties of the grease has become the focus of the study of RV reducer performance. Here, SK‐1A grease is taken as the research object, and its rheological characteristics under wide temperature range working conditions (−20–40°C) are investigated through rheological experiments to analyze the potential influence of the performance of RV reducer. However, the ordinary way of research is too complicated to better research the rheological properties of grease for a variety of working conditions. The Elman neural network (ENN) model was used to predict the rheological properties, and the results were compared with those of back propagation (BP) and radial basis function (RBF) neural networks. The results demonstrate that the ENN model demonstrates high prediction accuracy for grease rheological property prediction by comparing three types of predictions. This method can provide a theoretical reference for the accurate prediction of the rheological properties of lubricating grease affected by complex multifactors.

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Some rheological properties of plastic greases by Carreau-Yasuda model

Cited by 11 publications

References 51 publications

Roles of NaCl in Enhancing the Stability of Water-in-Oil High Internal Phase Emulsions

Roles of NaCl in Enhancing the Stability of Water-in-Oil High Internal Phase Emulsions

Carboxymethyl Scleroglucan Synthesized via O-Alkylation Reaction with Different Degrees of Substitution: Rheology and Thermal Stability

Rheological characteristics and behaviour prediction of lubricating grease for RV reducer across a wide temperature range

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