Nanoparticle-enhanced Lubrication: CFD Insights into Cavitation in Three-lobe Journal Bearings Using TiO2 Nanofluids
J. Environ. Nanotechnol., Volume 14, No 3 (September 2025) pp. 604-611
Abstract
Three-lobe journal bearings are widely utilized in high-speed rotating machinery due to their superior dynamic stability and load-carrying characteristics. However, they are prone to vapor cavitation in the diverging regions, which can degrade lubrication performance and operational reliability. The present research focused on a comprehensive numerical investigation of pressure distribution and cavitation behavior in three-lobe journal bearings operating at 500 rpm, using both conventional base oil (Mobil DTE 24) and a nano-lubricant formulated with 0.5 wt. % titanium dioxide (TiO2) nanoparticles. Simulations were performed using the Zwart–Gerber–Belamri (ZGB) cavitation model within a multiphase CFD framework in ANSYS Workbench 2024R1. The analysis focused on comparing pressure profiles under both cavitating and non-cavitating conditions. The results indicated that the TiO2 nano-lubricant significantly enhanced bearing performance by increasing peak pressure by up to 50% and improving load-carrying capacity by approximately 36–40% compared to the base oil. Under cavitating conditions, the nano-lubricant suppressed vapor formation by increasing the minimum pressure from –0.45 MPa to –0.13 MPa, indicating a 70% reduction in cavitation intensity compared to the base oil. Under non-cavitating operation, the TiO2 nanofluid also demonstrated 10–20% better pressure uniformity and film stability, which contributed to reduced friction losses and improved lubrication reliability. Overall, the findings validated the tribological potential of TiO2-based nano-lubricants as an environmentally friendly and performance-enhancing alternative to conventional lubricants in hydrodynamic bearing applications.
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Reference
Abass, B. A., Ahmed, S. Y. and Kadhim, Z. H., Analysis and optimization of nanolubricated journal bearing under thermoelasto-hydrodynamic lubrication considering cavitation effect, Tribol. Ind., 45(4), 618–629 (2023).
Awad, H., Abdou, K. M. and Saber, E., The effect of axial geometrical variations on the steady state characteristics of oil lubricated journal bearings using titanium dioxide nanoparticles as lubricant additives, Sci. Rep., 15(1), 15701 (2025).
https://doi.org/10.1038/s41598-025-97948-7
Biswas, N., Chakraborti, P. and Belkar, S., An analytical and experimental approach for pressure distribution analysis of a particular lobe and plain bearing performance keeping in view of all impeding varying parameters associating with fixed lubrication SAE20W40, J. Mech. Sci. Technol., 30, 2187–2193 (2016).
https://doi.org/10.1007/s12206-016-0426-9
Chen, Y., Sun, Y., He, Q. and Feng, J., Elastohydrodynamic behavior analysis of journal bearing using fluid–structure interaction considering cavitation, Arab. J. Sci. Eng., 44, 1305–1320 (2019).
https://doi.org/10.1007/s13369-018-3467-9
Dang, R. K., Chauhan, A. and Dhami, S. S., Static thermal performance evaluation of elliptical journal bearings with nano-lubricants, Proc. Inst. Mech. Eng. Part J: J. Eng. Tribol., 235(8), 1627–1640 (2021).
https://doi.org/10.1177/1350650120970742
Dhande, D. Y. and Pande, D. W., Multiphase flow analysis of hydrodynamic journal bearing using CFD coupled fluid structure interaction considering cavitation, J. King Saud Univ.–Eng. Sci., 30(4), 345–354 (2016).
https://doi.org/10.1016/j.jksues.2016.04.005
Dhande, D. Y., Pande, D. W. and Lanjewar, G. H., Numerical analysis of three-lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation, J. Braz. Soc. Mech. Sci. Eng., 40(8), 393(2018).
https://doi.org/10.1007/s40430-018-1311-5
Dhanola, A. and Garg, H. C., Experimental analysis of the efficacy of vegetable oil-based nano-lubricants for improving journal-bearing performance, Proc. Inst. Mech. Eng. Part J: J. Eng. Tribol., 235(9), 1974–1991 (2021).
https://doi.org/10.1177/1350650120981478
Dong, J., Wen, H., Zhu, J., Guo, J. and Zong, C., Analysis of thermo-hydrodynamic lubrication of three-lobe semi-floating ring bearing considering temperature–viscosity effect and static pressure flow, Lubricants, 12(4), 140 (2024).
https://doi.org/10.3390/lubricants12040140
El-Said, B., El-Souhily, W., Crosby, W. and El-Gamal, H., The performance and stability of three-lobe journal bearing textured with micro protrusions, Alex. Eng. J., 56(4), 423–432 (2017).
https://doi.org/10.1016/j.aej.2017.08.003
Gundarneeya, T. P. and Vakharia, D. P., Performance analysis of journal bearing operating on nano-lubricants with TiO₂, CuO and Al₂O₃ nanoparticles as lubricant additives, Mater. Today: Proc., 45, 5624–5630 (2021).
https://doi.org/10.1016/j.matpr.2021.02.350
Lotfizadeh, D. A., Ghadimi, A. and Metselaar, H. S. C., Box–Behnken experimental design for investigation of stability and thermal conductivity of TiO₂ nanofluids, J. Nanopart. Res., 15(1), 1369(2013).
https://doi.org/10.1007/s11051-012-1369-4
Rasep, Z., Yazid, M. N. A. W. M. and Samion, S., A study of cavitation effect in a journal bearing using CFD: A case study of engine oil, palm oil and water, J. Tribol., 28, 48–62 (2021).
Roy, L. and Kakoty, S. K., Application of genetic algorithm in optimization of hydrodynamic bearings, Proc. 4th Int. Conf. Soft Comput. Problem Solving, 1, 207–217 (2015).
https://doi.org/10.1007/978-81-322-2217-0_18
Singla, A. and Chauhan, A., Evaluation of oil film pressure and temperature of an elliptical journal bearing—An experimental study, Tribol. Ind., 38(1), 74–82 (2016).
Singla, A., Kumar, A., Bala, S., Singh, P. and Chauhan, A., Thermo-hydrodynamic analysis on temperature profile of circular journal bearing using computational fluid dynamics, 2014 Recent Advances in Engineering and Computational Sciences (RAECS), IEEE, 1–6 (2014).
https://doi.org/10.1109/RAECS.2014.6799595
Suryawanshi, S. R. and Pattiwar, J. T., Experimental study on an influence of bearing geometry and TiO₂ nanoparticle additives on the performance characteristics of fluid film lubricated journal bearing, Tribol. Ind., 41(2), 250–259 (2019).
https://doi.org/10.24874/ti.2019.41.02.08
Tauviqirrahman, M., Wijaya, M., Muchammad, M., Paryanto, P. and Jamari, J., Hydrodynamic lubrication analysis of journal bearing considering cavitation, slip and thermal condition, J. Tribol., 42, 1–20 (2024).
Wu, Y. Y., Tsui, W. C. and Liu, T. C., Experimental analysis of tribological properties of lubricating oils with nanoparticle additives, Wear, 262(7–8), 819–825 (2007).
