dr. J.A. Osara (Jude)

Assistant Professor
ET-MS3-STT
Horst Complex
j.a.osara@utwente.nl
+31534897642
Business card

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

2024
On the film thickness in grease lubricated deep groove ball bearings. University of Twente. Shetty, P.https://doi.org/10.3990/1.9789036561679Vibrations and film thickness in grease-lubricated deep groove ball bearings, Article 109325. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2024.109325Effect of Grease Filling on the Film Thickness in Deep-Groove Ball Bearings, 62-69. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2282632On the Required Energy to Break Down the Thickener Structure of Lubricating Greases, 123-128. Meijer, R. J., Osara, J. A. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2297041Grease material properties from first principles thermodynamics, 36-50. Osara, J. A., Chatra, S. & Lugt, P. M.https://doi.org/10.1002/ls.1672
2023
The lubrication mechanism behind the transition from churning to bleeding in grease lubricated bearings – Experimental characterization, 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. 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, 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, 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, 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, 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, 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, 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)), 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, Article 120051. Osara, J. A. & Bryant, M. D.https://doi.org/10.1016/j.ijheatmasstransfer.2020.120051
2019
Thermodynamics of grease degradation, 433-445. Osara, J. A. & Bryant, M. D.https://doi.org/10.1016/j.triboint.2019.05.020

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

Address

University of Twente

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

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