Dr. J.A. Osara | People Pages: Find employees & contact details | University of Twente

Dr. Jude A. Osara is an assistant professor in the Surface Technology & Tribology (STT) and Tribology Based Maintenance (TBM) research areas in the department of Mechanics of Solids, Surfaces and Systems (MS3). He obtained his PhD in Mechanical Engineering - Thermal/Fluids Systems at the University of Texas at Austin, Texas, USA, with a dissertation on "degradation thermodynamics", an approach he applied to lubricant grease degradation and general fatigue, among others. Prior to his PhD degree, Jude worked in the automotive industry as a thermal/fluids engineer optimizing engine performance, and as an applied mechanics engineer analyzing/optimizing lubrication and structural integrity of engine overhead systems. Between 2017 and 2020, Dr. Osara further developed his PhD research discovery into engineering analysis tools for industrial use, while doing stints as a post-doctoral fellow and an adjunct professor at the University of Texas at Austin. At UT Austin, Dr. Osara taught Applied Thermodynamics and Fluid Mechanics. Currently, he teaches Tribology, and his research focuses on bearing grease and solid interfacial degradation, life models, failure mechanisms, and materials, all of which he applies his thermodynamics expertise to. Dr. Osara also manages the SKF University Technology Centre (UTC) for Grease Lubrication.

Expertise

Material Science
- Lubricating Grease
- Characterization
- Ball Bearing
- Film Thickness
- Temperature
Physics
- Entropy
- Model
Engineering
- Grease

Organisations

Lubricating Greases, Bearings, Frictional and Tribological Interfaces.
Thermodynamic Characterization of Tribological Systems.
Mechanics of Solids, Semi-Solids and Fluids.
Failure Mechanisms and Prediction.
Materials.

Publications

Jump to: 2024 | 2023 | 2022 | 2021 | 2020

2024

On the film thickness in grease lubricated deep groove ball bearings (2024)[Thesis › PhD Thesis - Research UT, graduation UT]. University of Twente. Shetty, P.https://doi.org/10.3990/1.9789036561679Vibrations and film thickness in grease-lubricated deep groove ball bearings (2024)Tribology international, 193. Article 109325. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2024.109325Methods to Calculate Entropy Generation (2024)Entropy, 26(3). Article 237. Osara, J. A. & Bryant, M. D.https://doi.org/10.3390/e26030237Effect of Grease Filling on the Film Thickness in Deep-Groove Ball Bearings (2024)Tribology transactions, 67(1), 62-69. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2282632Grease material properties from first principles thermodynamics (2024)Lubrication science, 36(1), 36-50. Osara, J. A., Chatra, S. & Lugt, P. M.https://doi.org/10.1002/ls.1672On the Required Energy to Break Down the Thickener Structure of Lubricating Greases (2024)Tribology transactions, 67(1), 123-128. Meijer, R. J., Osara, J. A. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2297041

2023

The lubrication mechanism behind the transition from churning to bleeding in grease lubricated bearings – Experimental characterization (2023)Tribology international, 183. Article 108375. Sathwik Chatra, K. R., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2023.108375The process of churning in grease lubricated bearings: Identification and Thermo-mechanical characterization (2023)[Thesis › PhD Thesis - Research UT, graduation UT]. University of Twente. Kalsanka Ramakrishna, S. C.https://doi.org/10.3990/1.9789036555081Thermo-mechanical aging during churning in grease lubricated bearings and its impact on grease life (2023)Tribology international, 181. Article 108248. Sathwik Chatra, K. R., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2023.108248On the evolution of oil-separation properties of lubricating greases under shear degradation (2023)Tribology international, 179. Article 108154. Hogenberk, F., Osara, J. A., Ende, D. v. d. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2022.108154

2022

Impact of grease churning on grease leakage, oil bleeding and grease rheology (2022)Tribology international, 176. Article 107926. Chatra, K. R. S., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2022.107926Measuring Film Thickness in Starved Grease-Lubricated Ball Bearings: An Improved Electrical Capacitance Method (2022)Tribology transactions, 65(5), 869-879. Shetty, P., Meijer, R. J., Osara, J. A. & Lugt, P. M.https://doi.org/10.1080/10402004.2022.2091067Thermodynamic Characterization of Grease Oxidation-Thermal Stability via Pressure Differential Scanning Calorimetry (2022)Tribology transactions, 65(3), 542-554. Osara, J. A., Lugt, P. M., Bryant, M. D. & Khonsari, M. M.https://doi.org/10.1080/10402004.2022.2050452

2021

Evaluating Degradation Coefficients from Existing System Models (2021)Applied Mechanics, 2(1), 159-173. Osara, J. A. & Bryant, M. D.https://doi.org/10.3390/applmech2010010

2020

Corrigendum to “Thermodynamics of grease degradation” [Tribol Int 137 (2019) 433–445] (Tribology International (2019) 137 (433–445), (S0301679X19302798), (10.1016/j.triboint.2019.05.020)) (2020)Tribology international, 150. Article 106369. Osara, J. A. & Bryant, M. D.https://doi.org/10.1016/j.triboint.2020.106369A temperature-only system degradation analysis based on thermal entropy and the degradation-entropy generation methodology (2020)International journal of heat and mass transfer, 158. Article 120051. Osara, J. A. & Bryant, M. D.https://doi.org/10.1016/j.ijheatmasstransfer.2020.120051

Other contributions

Osara J.A., Sathwik Chatra K.R. & Lugt P.M. (2023). Grease material properties from first principles thermodynamics. Lubrication Science. https://doi.org/10.1002/ls.1672

Research profiles

Affiliated study programs

Courses academic year 2024/2025

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses academic year 2023/2024

YouTube Video Presentations:

Spotlight: https://www.utwente.nl/en/news/2024/7/1607532/new-thermodynamics-method-enhances-maintenance-and-prevents-failures

Address

University of Twente

Horst Complex (building no. 20)
De Horst 2
7522 LW Enschede
Netherlands

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