Magnetorheological (MR) Fluids and Devices, Rheology, Tribology, Non-Newtonian Fluid Flow, Design of Biomedical devices.

Car Driving and Bike Racing

ME401: Industrial Engineering and Operation Research, MH501: Fundamentals of Mechatronics, ME214: Mechanics of Solids, ME208: Kinematics and Dynamics of Mechanisms ME313: Design of Machine Elements ME102: Engineering Mechanics

Associate Professor, Department of Mechanical Engineering, Indian Institute of Technology Patna (May, 2023 – Present) > Assistant Professor, Department of Mechanical Engineering, Indian Institute of Technology Patna (December, 2015 – May, 2023) > Postdoctoral position, Division of Fluid and Experimental Mechanics, Lulea University of Technology, Sweden (January, 2016 – October, 2016) > Assistant Professor, Department of Mechanical Engineering, National Institute of Technology Rourkela (July, 2015 – December, 2015) > Assistant Professor, Department of Mechanical Engineering, Delhi Technological University (August, 2014 – June, 2015)

• Departmental PhD Coordinator (Mechanical Engineering) (2019-2020)
• Departmental Library Committee Member (2019-2021)
• Departmental TEQIP-III program coordinator (2019 to 2021)
• Professor in Charge Guest house, IIT Patna (2017-2018)
• Liaison Officer, IIT Patna (2019 to 2023)

• First Class Honours in Bachelor of Production Engineering
• SERB International Research Experience Fellowship at Lulea University of Technology Sweden (Jan, 2024 to May 2024)
• Visiting Scientist, Tribology Group, Sponsored by University of Poitiers, France 

Tribology Society of India (TSI), Life Member Society of Automobile Engineers (SAE), India

1. Sarkar, C. & Singh, B. K., Patent Application No. 202531017176 (Filed) dated February 27, 2025 for title “A tribometer cell for a pin on disc tribometer”
2. Sarkar, C. & Singh, R. K., Patent Application No. 202431086857 (Filed) dated November 11, 2024 for title “A magneto-rheological [MR] brake assembly of a vehicle”
3. Sarkar, C. & Singh, R. K., Patent Application No. 202231067989 (Filed) dated November 25, 2022 for title “A magnetorheological drum brake device”
4. Hirani, H. & Sarkar, C., Patent No. 416532 dated January 03, 2023 (Granted) for the title “Magnetorheological brake operating under shear, compression and valve modes”

Journal Publications

1. Singh, R. K., & Sarkar, C. (2025). Magnetorheological brake with low off-state viscous torque and high on-state braking torque: Design and experimental validation. Journal of Magnetism and Magnetic Materials, 628, 173171.
2. Singh, B. K., & Sarkar, C. (2025). Design and development of ball on three plates tribometer under controlled magnetic field and impact of MHD lubrication on EHL point contact. ASME Journal of Tribology, 147(12), 124601 (10 pages).
3. Maurya, C. S., & Sarkar, C. (2024). Magnetorheological fluids: a comprehensive review of operational modes and performance under varied circumstances. Rheologica Acta, 63(11), 765-785.
4. Kesharwani, R., Jha, K. K., Imam, M., & Sarkar, C. (2024). Multiphysics computational modelling and experimental analysis of friction stir welding of aluminium alloy metal matrix composites (AAMMCs). Engineering Failure Analysis, 166, 108893.
5. Quamar, D., & Sarkar, C. (2024). Intelligent diagnosis of magnetorheological clutch using image processing techniques. Smart Materials and Structures, 33(8), 085049.
6. Kesharwani, R., Jha, K. K., Imam, M., & Sarkar, C. (2024). Selection of groove dimension in the fabrication of particulate reinforced aluminium matrix composites using friction stir welding. Materials Letters, 367, 136640.
7. Singh, R. K., & Sarkar, C. (2024). Comparison of performance and tribological properties of electromechanical brake with magnetorheological fluid and magnetic powder. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 238(6), 697-705.
8. Kesharwani, R., Jha, K. K., Imam, M., Sarkar, C., & Barsoum, I. (2024). Correlation of microstructure, texture, and mechanical properties of friction stir welded Joints of AA7075-T6 plates using a flat tool pin profile. Heliyon, 10(3).
9. Singh, R. K., & Sarkar, C. (2024). Study of effect of graphite based magnetorheological fluids on braking performance and rotor surface of magnetorheological disk brake using full-scale brake inertia dynamometer. Tribology Transactions, 67(1), 157-172.
10. Singh, R. K., & Sarkar, C. (2024). Tribological and braking performance study of additive-based MR fluids in shear and hybrid mode using MR drum brake. Tribology International, 192, 109284.
11. Singh, B. K., & Sarkar, C. (2024). Design, development, and performance analysis of plate-plate hybrid magneto rheometer considering uniform radial magnetic flux. Journal of Magnetism and Magnetic Materials, 590, 171691.
12. Quamar, D., & Sarkar, C. (2024). Modelling of performance parameters of phenolic base resins Non-Asbestos Organic (NAO) friction material in brake pad using machine learning algorithms. Tribology International, 191, 109188.
13. Kesharwani, R., Jha, K. K., Sarkar, C., & Imam, M. (2023). Effect of tool pin profile on the heat generation model of the friction stir welding of aluminium alloy. International Journal of Materials Research, 114(10-11), 861-871.
14. Kesharwani, R., Jha, K. K., Imam, M., Sarkar, C., & Barsoum, I. (2023). Comparison of microstructural, texture and mechanical properties of SiC and Zn particle reinforced FSW 6061-T6 aluminium alloy. Journal of Materials Research and Technology, 26, 3301-3321.
15. Shah, M. S., Gupta, D., Saha, P., Assam, A., & Sarkar, C. (2023). A novel flushing technique to improve micro-EDM dressing process stability: assessment through analyzing debris evacuation. The International Journal of Advanced Manufacturing Technology, 127(1), 775-794.
16. Raj, A., Sarkar, C., Kumar, P., & Pathak, M. (2023). Study of Magnetorheological Grease Flow in a Double Restriction Seal Configuration. Journal of Tribology, 145(5), 054401.
17. Singh, R. K., & Sarkar, C. (2023). In-situ braking torque and temperature analysis of two-wheeler drum brake in friction braking. Journal of Mechanical Science and Technology, 37(4), 2069-2077.
18. Singh, R. K., & Sarkar, C. (2023). Two-wheeler magnetorheological drum brake operating under hybrid mode for enhancing braking torque: Development and validation. Mechatronics, 92, 102971.
19. Singh, R. K., & Sarkar, C. (2023). Characterization of magnetorheological brake in shear mode using high-strength MWCNTs and fumed silica-based magnetorheological fluids at low magnetic fields. Journal of Tribology, 145(3), 031702.
20. Kesharwani, R., Jha, K. K., Imam, M., & Sarkar, C. (2023). The optimization of gap width size during friction stir welding of AA 6061-T6 with Al2O3 particle reinforcement. Journal of Materials Engineering and Performance, 32(13), 6008-6027.
21. Kesharwani, R., Jha, K. K., Anshari, M. A. A., Imam, M., & Sarkar, C. (2022). Comparison of microstructure, texture, and mechanical properties of the SQ and thread pin profile FSW joint of AA6061-T6 with Al2O3 particle reinforcement. Materials Today Communications, 33, 104785.
22. Quamar, D., & Sarkar, C. (2022). Optimal Design of Hydraulic Disc Brake for Magnetorheological (MR) Application. Defence Science Journal, 72(6).
23. Maurya, C. S., Khan, S., & Sarkar, C. (2022). Ferrofluids with monomer, dimer, and trimer nanoparticles: Effects of the dipole–dipole moment and magnetic field on the cluster formation. Journal of Magnetism and Magnetic Materials, 564, 170022.
24. Kesharwani, R., Jha, K. K., Imam, M., & Sarkar, C. (2022). The optimization of the groove depth height in friction stir welding of AA 6061-T6 with Al2O3 powder particle reinforcement. Journal of Materials Research, 37(21), 3743-3760.
25. Kesharwani, R., Jha, K. K., Sarkar, C., & Imam, M. (2022). Numerical and experimental analysis on friction stir welding of the dissimilar materials 6061-T6 AA and pure copper. Materials Today: Proceedings, 65, 3132-3142.
26. Raj, A., Sarkar, C., Kumar, P., & Pathak, M. (2022). Investigation of magnetorheological grease flow under the influence of a magnetic field. Journal of Molecular Liquids, 361, 119682.
27. Maurya, C. S., & Sarkar, C. (2022). Characterization of highly stable water-based magnetorheological gel using OPTIGEL-WX as an additive: The study of magneto-induced rheological and viscoelastic properties. Journal of industrial and engineering chemistry, 110, 137-149.
28. Thakur, M. K., & Sarkar, C. (2022). Design and testing of a conventional clutch filled with magnetorheological fluid activated by a flexible permanent magnet at low compressive load: Numerical simulation and experimental study. Journal of Tribology, 144(2), 021205.
29. Maurya, C. S., & Sarkar, C. (2022). Rheological and creep and recovery behavior of carbonyl iron water-based magnetorheological gel using laponite as an additive and oleic acid as a surfactant. Rheologica Acta, 61(2), 99-110.
30. Maurya, C. S., & Sarkar, C. (2022). Dynamic and creep and recovery performance of Fe3O4 nanoparticle and carbonyl iron microparticle water-based magnetorheological fluid. Journal of Intelligent Material Systems and Structures, 33(6), 743-755.
31. Thakur, M. K., & Sarkar, C. (2022). Lubrication performance of magnetorheological fluid in shear mode magnetorheological clutch with and without groove. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 236(2), 338-355.
32. Raj, A., Sarkar, C., & Pathak, M. (2022). Thermal and multiphase flow simulations of polytetrafluoroethylene-based grease flow in restricted geometry. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 236(1), 80-89.
33. Thakur, M. K., & Sarkar, C. (2021). Thermal and tribological performance of graphite flake-based magnetorheological fluid under shear mode clutch. Journal of Tribology, 143(12), 121806.
34. Thakur, M. K., & Sarkar, C. (2021). Investigation of different groove profile effects on torque transmission in shear mode magnetorheological clutch: Numerical simulation and experimental study. Journal of Tribology, 143(9), 091801.
35. Kesharwani, R., Imam, M., & Sarkar, C. (2021). Effect of flat probe on local heat generation and microstructural evolution in friction stir welding of 6061-T6 aluminium alloy. Transactions of the Indian Institute of Metals, 74(12), 3185-3203.
36. Raj, A., Sarkar, C., & Pathak, M. (2021). Magnetorheological Characterization of PTFE-Based Grease With MoS 2 Additive at Different Temperatures. IEEE Transactions on Magnetics, 57(7), 1-10.
37. Maurya, C. S., & Sarkar, C. (2021). Rheological response of soft flake-shaped carbonyl iron water-based MR fluid containing iron nanopowder with hydrophilic carbon shell. Rheologica Acta, 60, 277-290.
38. Maurya, C. S., & Sarkar, C. (2021). Synthesis and characterization of novel flake-shaped carbonyl iron and water-based magnetorheological fluids using laponite and oleic acid with enhanced sedimentation stability. Journal of Intelligent Material Systems and Structures, 32(14), 1624-1639.
39. Maurya, C. S., & Sarkar, C. (2020). Effect of Fe₃O₄ nanoparticles on magnetorheological properties of flake-shaped carbonyl iron water-based suspension. IEEE Transactions on Magnetics, 56(12), 1-8.
40. Thakur, M. K., & Sarkar, C. (2020). Experimental and Numerical Study of Magnetorheological Clutch with Sealing at Larger Radius Disc. Defence Science Journal, 70(6).
41. Singh, A., Kumar Thakur, M., & Sarkar, C. (2020). Design and development of a wedge shaped magnetorheological clutch. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 234(9), 1252-1266.
42. Thakur, M. K., & Sarkar, C. (2020). Influence of graphite flakes on the strength of magnetorheological fluids at high temperature and its rheology. IEEE Transactions on Magnetics, 56(5), 1-10.
43. Maurya, C. S., & Sarkar, C. (2020). Magnetic and transient temperature field simulation of plate–plate magnetorheometer using finite-element method. IEEE Transactions on Magnetics, 56(4), 1-9.
44. Kesharwani, R., Imam, M., & Sarkar, C. (2020). Clarification on the choice of sheet positioning in friction stir welding of dissimilar materials. Manufacturing Letters, 24, 100-104.
45. Westerberg, L. G., Farré-Lladós, J., Sarkar, C., & Casals-Terré, J. (2018). Contaminant particle motion in lubricating grease flow: A computational fluid dynamics approach. Lubricants, 6(1), 10.
46. Sarkar, C., Westerberg, L. G., Höglund, E., & Lundström, T. S. (2018). Numerical simulations of lubricating grease flow in a rectangular channel with and without restrictions. Tribology Transactions, 61(1), 144-156.
47. Westerberg, L. G., Sarkar, C., Lladós, J. F., Lundström, T. S., & Höglund, E. (2017). Lubricating grease flow in a double restriction seal geometry: A computational fluid dynamics approach. Tribology letters, 65, 1-17.
48. Sarkar, C., & Hirani, H. (2017). Experimental studies on magnetorheological brake containing plane, holed and slotted discs. Industrial Lubrication and Tribology, 69(2), 116-122.
49. Sarkar, C., & Hirani, H. (2015). Particle Dynamics of Polydisperse Magnetorheological Fluids. Smart Science, 3(4), 176-187.
50. Sarkar, C., & Hirani, H. (2015). Development of a magnetorheological brake with a slotted disc. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 229(14), 1907-1924.
51. Sarkar, C., & Hirani, H. (2015). Synthesis and Characterisation of Nano Silver Particle-based Magnetorheological Fluids for Brakes. Defence Science Journal, 65(3).
52. Sarkar, C., & Hirani, H. (2015). Effect of particle size on shear stress of magnetorheological fluids. Smart Science, 3(2), 65-73.
53. Sarkar, C., & Hirani, H. (2013). Theoretical and experimental studies on a magnetorheological brake operating under compression plus shear mode. Smart Materials and Structures, 22(11), 115032.
54. Sarkar, C., & Hirani, H. (2013). Synthesis and characterization of antifriction magnetorheological fluids for brake. Defence science journal, 63(4), 408.
55. Sarkar, C., & Hirani, H. (2013, February). Design of a squeeze film magnetorheological brake considering compression enhanced shear yield stress of magnetorheological fluid. In Journal of Physics: Conference Series (Vol. 412, No. 1, p. 012045). IOP Publishing.

C Sarkar, “Ferromagnetic particles removal from bearings – A Computational Fluid Dynamics Approach”, 11th International Conference on Industrial Tribology, IndiaTrib-2022, 2022, New Delhi. M Thakur, C Sarkar, S Chouksey, & R Srinivas, “Numerical study of the plane, slotted and holed disc magnetorheological brakes: A Computational Fluid Dynamics approach”, 9th International and 49th National Conference on FMFP 2022, 2022, IIT Roorkee. C Sarkar, “Numerical simulations of magnetorheological grease in a rectangular channel with- and without restrictions in the presence of external magnetic field”, 10TH International Conference on Industrial Tribology (INDIATRIB – 2019), 2019, Indian Institute of Science (IISc), Bangalore, India. C Sarkar, “Numerical simulation of transmiitable torque in rotating magnetorheological fluid device with different surface texture”, STLE Tribology Frontiers Conference, 2019, Chicago, USA. C Sarkar, “Lubricating grease flow: A computational fluid dynamics Approach”, All India seminars on ‘Major advances and sustainable developments in lubrication domain’, 13th September 2018, Tata Steel Jamshedpur, India. C Sarkar, “Studies on Magnetorheological brake operating under compression and shear modes”, Tribology Department, Central Mechanical Engineering Research Institute Durgapur, 7th August 2018, Durgapur, India. C Sarkar, “Computational Fluid Dynamics of Grease Flow”, Division of Fluid and Experimental Mechanics, Lulea University of Technology Sweden, 18 March 2016, Lulea University of Technology, Sweden. C Sarkar, and H Hirani, “Design of a high torque magnetorheological brake considering compression enhanced shear yield stress of magnetorheological fluid”, 13th International Conference on Electrorheological Fluids and Magnetorheological Suspensions, 2-6 July 2012, Gazi University, Ankara, Turkiye. C Sarkar and H Hirani, “Parametric Design of a Compression Enhanced Shear Yield Stress Magnetorheological Fluid Brake”, 1st National Conference on Thermal, Fluid and Manufacturing Science, J 20-21 January 2012, Surat, India. C Sarkar and B N Lahiri, “Operational ergonomics and productivity drive through flow process charting of non-parallel drilling operations on cubical block with reconfigurable drilling machine”, International Conference on Ergonomic for Everyone, HWWE-2009, 17-19 December 2009, Calcutta University, Kolkata, India.