Viscosity behaviour and thermal conductivity prediction of CuO-blend oil based nano-blended lubricant

Proceedings of the Institution of Mechanical Engineers, Part J:

2021

The present experimental study explores the performance of Hydrodynamic journal bearings operating with vegetable oil-based nanolubricants. For this study, titanium oxide nanoparticles have been added to canola oil by varying the volume fraction from 0% to 0.04%. An assessment of performance characteristics has been done by using a journal-bearing test rig under different operating conditions. The outcome of the experimental results aimed at the addition of nanoparticles to base lubricants to improve the performance was observed to be favorable. However, under high operating conditions, the influence of nanoparticles is observed to be less useful. The fluid film pressure of nanolubricants increased up to a specific volume concentration of titanium oxide nanoparticles (i.e. 0.02%) beyond which no further enhancement was observed. At a load of 3000 N, the fluid film pressure increased up to 10%, when a bearing is lubricated using canola oil with a 0.02% volume fraction of nanoparticles. The heat transfer rate was found to be higher for nanolubricants in comparison to a base oil and the fluid film temperature was reduced by up to 15% at a volume fraction of 0.04%. Furthermore, rheological studies reveal that the prepared nanolubricants exhibited Newtonian behavior under the given conditions. The percentage increment of viscosity varied from 2.1% to 15.4% and 2.43% to 13.89% for a volume fraction ranging from 0.01% to 0.04% at a temperature of 40 °C and 100 °C, respectively. The dynamic light scattering results confirmed that the particles were well distributed in a base lubricant without much aggregation.

Section: Resultsmentioning

confidence: 99%

Experimental analysis of the efficacy of vegetable oil-based nanolubricants for improving journal-bearing performance

Proceedings of the Institution of Mechanical Engineers, Part J:

2021

“…The improvement in the viscosity of the nanofluids agrees with the earlier works. 1,41 Percentage enhancement in the viscosity of nanofluids by adding different nanoadditives concentrations is tabulated in Table 2. At a range of nanoadditives from 0.01 vol.% to 0.04 vol.%, the viscosity enhanced by 2-15%, 2-13% and 2-12% at temperature of 40 °C, 60 °C and 80 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The results are well in agreement with the earlier studies. 1,34,41,43 The temperature range from 40 to 80 °C, the viscosity nanofluids is decreased by 66.72%, 66.73%, 68.32%, 67.73%, and 67.53% for canola oil containing TiO 2 nanoadditives of 0.01 vol.%, normal 0.02 vol.%, normal 0.03 vol.% and normal 0.04 vol.%, respectively. The error value in Table 3 represents the standard deviation for multiple measurements.…”

Section: Resultsmentioning

confidence: 99%

“…In ancient times, before the invention of petroleum-based lubricants, commonly vegetable oils were used as lubricants. 1 As the researchers focused on petrochemicals and developed petroleum-based lubricants, the requirement of vegetable oils kept falling because of lubricity, stability, and economic issues. But the main problems with the petroleum-based lubricants are that they are non-biodegradable and toxic.…”

Section: Introductionmentioning

confidence: 99%

“…Further, it is predicted that they will only be for the next 50 years. 1 Therefore, the interest of researchers is shifting again towards the biodegradable lubricants such as vegetable oils. These oils meet all the requirements that a petroleum-based lubricant possesses, for instance, good viscosity indices, high flash point, and excellent lubricity, and also they are more environment-friendly than the conventional oils.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dispersion stability and rheology study of canola oil containing TiO₂nanoadditives for tribological applications: An experimental approach

Proceedings of the Institution of Mechanical Engineers, Part J:

2020

Recently, the biodegradable lubricants developed from vegetable oils are gaining popularity concerning biodegradability and sustainability. Moreover, the stabilized suspension of nanoparticles in the base lubricant is a crucial requirement of any nanolubricant for the long term. To evaluate the aggregation behaviour of nanoparticles in base lubricant and rheological properties of nanolubricants are important as other properties. Keeping in view of these, the aim of the present study has been categorized into two parts. Firstly, the dispersion stability of nanofluids in terms of the aggregation behaviour of nanoadditives with the standing time has been investigated under three non-ionic surfactants and one anionic surfactant with several TiO2- to-surfactant mass ratios utilizing dynamic light scattering (DLS) technique. The outcomes demonstrated that the TiO2- to-Triton X-100 mass ratio of 1:3 has long term stability. Secondly, the rheological behaviour of canola oil containing a varying range of nanoadditives has been conducted for various temperatures and shear rates. The results indicated that all the nanofluids exhibit Newtonian behaviour and the viscosity of canola oil increases as nanoadditives concentration increases. The experimental results are also compared and validated with the existing viscosity models, and a new regression model has been suggested.

Influence of different surfactants on the stability and varying concentrations of TiO2 nanoparticles on the rheological properties of canola oil-based nanolubricants

2020

Appl Nanosci

The present study addresses the dispersion stability and rheological analysis of canola oil-based nanolubricants. The stability of canola oil-based nanolubricant was examined under different surfactants and different particle to surfactant mass ratios for the period of 30 days. The experimental results demonstrated that nanolubricants with surfactant significantly improve the dispersion stability as compared to non-surfactant lubricant. However, on the basis of visual inspection and absorbance value, the highest stability was recorded for the sample containing TiO 2 to Triton X-100 mass ratio of 1:3. In addition, the influence of different concentrations of nanoparticles on the rheological behaviour of canola oil-based nanolubricants was also assessed. The outcomes showed that the nanolubricants exhibited Newtonian behaviour. The viscosity of nanolubricants increased with increase of nanoparticles concentration and decreased with temperature. Experimental values were compared with available viscosity models and a new correlation model was proposed with the margin of deviation of 1.38%.