About Me
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
Physics & Astronomy
# Degradation
# Greases
# Thermodynamics
Engineering & Materials Science
# Degradation
# Entropy
# Lubricating Greases
# Thermodynamics
Chemistry
# Entropy
Organisations
Research
- 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
Recent
Shetty, P.
, Meijer, R. J.
, Osara, J. A.
, Pasaribu, R.
, & Lugt, P. M. (2024).
Vibrations and film thickness in grease-lubricated deep groove ball bearings.
Tribology international,
193, Article 109325. Advance online publication.
https://doi.org/10.1016/j.triboint.2024.109325
Meijer, R. J.
, Osara, J. A.
, & Lugt, P. M. (2024).
On the Required Energy to Break Down the Thickener Structure of Lubricating Greases.
Tribology transactions,
67(1), 123-128.
https://doi.org/10.1080/10402004.2023.2297041
Shetty, P.
, Meijer, R. J.
, Osara, J. A.
, Pasaribu, R.
, & Lugt, P. M. (2024).
Effect of Grease Filling on the Film Thickness in Deep-Groove Ball Bearings.
Tribology transactions,
67(1), 62-69.
https://doi.org/10.1080/10402004.2023.2282632
Sathwik Chatra, K. R.
, Osara, J. A.
, & Lugt, P. M. (2023).
The lubrication mechanism behind the transition from churning to bleeding in grease lubricated bearings – Experimental characterization.
Tribology international,
183, Article 108375.
https://doi.org/10.1016/j.triboint.2023.108375
Sathwik Chatra, K. R.
, Osara, J. A.
, & Lugt, P. M. (2023).
Thermo-mechanical aging during churning in grease lubricated bearings and its impact on grease life.
Tribology international,
181, Article 108248.
https://doi.org/10.1016/j.triboint.2023.108248
Kalsanka Ramakrishna, S. C. (2023).
The process of churning in grease lubricated bearings: Identification and Thermo-mechanical characterization. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente.
https://doi.org/10.3990/1.9789036555081
Hogenberk, F.
, Osara, J. A.
, Ende, D. V. D.
, & Lugt, P. M. (2023).
On the evolution of oil-separation properties of lubricating greases under shear degradation.
Tribology international,
179, Article 108154.
https://doi.org/10.1016/j.triboint.2022.108154
Chatra, K. R. S.
, Osara, J. A.
, & Lugt, P. M. (2022).
Impact of grease churning on grease leakage, oil bleeding and grease rheology.
Tribology international,
176, Article 107926.
https://doi.org/10.1016/j.triboint.2022.107926
Osara, J. A.
, Lugt, P. M., Bryant, M. D., & Khonsari, M. M. (2022).
Thermodynamic Characterization of Grease Oxidation-Thermal Stability via Pressure Differential Scanning Calorimetry.
Tribology transactions,
65(3), 542-554.
https://doi.org/10.1080/10402004.2022.2050452
Shetty, P.
, Meijer, R. J.
, Osara, J. A.
, & Lugt, P. M. (2022).
Measuring Film Thickness in Starved Grease-Lubricated Ball Bearings: An Improved Electrical Capacitance Method.
Tribology transactions,
65(5), 869-879.
https://doi.org/10.1080/10402004.2022.2091067
Osara, J. A., & Bryant, M. D. (2021).
Evaluating Degradation Coefficients from Existing System Models.
Applied Mechanics,
2(1), 159-173.
https://doi.org/10.3390/applmech2010010
Osara, J. A., & Bryant, M. D. (2020).
A temperature-only system degradation analysis based on thermal entropy and the degradation-entropy generation methodology.
International journal of heat and mass transfer,
158, Article 120051.
https://doi.org/10.1016/j.ijheatmasstransfer.2020.120051
Osara, J. A., & Bryant, M. D. (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)).
Tribology international,
150, Article 106369.
https://doi.org/10.1016/j.triboint.2020.106369
Osara, J. A., & Bryant, M. D. (2019).
Thermodynamics of grease degradation.
Tribology international,
137, 433-445.
https://doi.org/10.1016/j.triboint.2019.05.020
Osara, J. A., & Bryant, M. D. (2019).
Thermodynamics of Fatigue: Degradation-Entropy Generation Methodology for System and Process Characterization and Failure Analysis.
Entropy,
21(7), Article 685.
https://doi.org/10.3390/e21070685
Osara, J. A. (2019).
Thermodynamics of Manufacturing Processes—The Workpiece and the Machinery.
Inventions,
4(2), Article 28.
https://doi.org/10.3390/inventions4020028
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
UT Research Information System
Google Scholar Link
Education
Affiliated Study Programmes
Bachelor
Master
Courses Academic Year 2023/2024
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 2022/2023
Media
YouTube Video Presentations:
Contact Details
Visiting Address
University of Twente
Faculty of Engineering Technology
Horst Complex
(building no. 20)
De Horst 2
7522LW Enschede
The Netherlands
Mailing Address
University of Twente
Faculty of Engineering Technology
Horst Complex
P.O. Box 217
7500 AE Enschede
The Netherlands