Browsing by Author "M, A."

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    Experimental investigation of rotor wound multi disc magneto-rheological fluid brake
    (SAGE Publications Ltd, 2025) Bhat, S.H.; A, A.; Naveen, S.; Kumar, H.; M, A.
    Magneto-Rheological fluid (MRF), known for changing properties under a magnetic field, is ideal for brakes and dampers in magnetically controlled devices. This research presents a novel design for a 10-disc MR brake using in-house Magneto-Rheological Fluid (MRF), distinguished by its integration of electromagnet windings directly onto the brake shaft. Magneto-static analysis, performed using Finite Element Method Magnetics (FEMM) software, optimized the material selection and dimensions, enhancing the magnetic field distribution across the MRF gap and maximizing braking torque. The design, with rotor windings and a consistent MRF gap, generates a uniform magnetic field, significantly boosting performance. Theoretical braking torque was estimated using Bingham plastic model for MRF characterization, aligning well with experimental results. The compact 10-disc MR brake design, weighing 1.19 kg, shows robust torque performance across varying current levels. Remarkably, prior research had not integrated electromagnet windings directly on the rotor of MR brake, marking this study as pioneering in advancing MR brake performance. © The Author(s) 2025.
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    Numerical Analysis of Pulsating Flow in a Smooth Constriction Using Immersed Boundary Method
    (Springer Science and Business Media Deutschland GmbH, 2020) Kolke, D.K.; M, A.; Maniyeri, R.
    A major incentive for studying the flow of an incompressible fluid through a smooth constriction comes from the medical field. These constrictions represent arterial stenosis which is caused by deposition of intravascular plaques. To understand some of the major complications which can arise from arterial stenosis, the knowledge of the flow characteristics in the vicinity of constriction is essential. The main objective of the present work is to develop a two-dimensional computational model using a feedback forcing-based immersed boundary (IB) method to study steady and laminar pulsatile flow in a channel with a smooth constriction and investigate the effects of the Womersley number on the flow property. The study assumes the immersed boundary walls as rigid, and the flow is considered viscous, incompressible, and axisymmetric. The pulsatile flow simulations are done for a wide range of Womersley number within the physiological conditions for blood flow in arteries. The results obtained are in good agreement with the data from the literature. © 2020, Springer Nature Singapore Pte Ltd.