Experimental Investigations of a Magneto-Rheological Brake Embedded in a Swirl Generator Apparatus

Szakal, R.; Bosioc, Alin; Muntean, Sebastian; Susan-Resiga, Daniela; Vékás, L.

doi:10.1007/978-3-030-02257-0_20

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…The influence of two elbow draft tube geometries detailed in the previous section is obtained under variable operating conditions. A magneto-rheological brake (MRB) with a cylindrical configuration has been designed and installed in the rotor hub to slow down its speed [70,71]. As a result, variable operating conditions are obtained in this case modifying the apparent viscosity of the magneto-rheological fluid (MRF) under variable magnetic fields generated by the coil of the MRB [72].…”

Section: Variable Operating Conditionsmentioning

confidence: 99%

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Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube

2021

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The paper focuses on the influence of the reshaped elbow geometry of the draft tube on the unsteady pressure field under different operating conditions. The experimental investigations are conducted considering two simplified geometrical configurations of the draft tubes with sharp heel elbow and modified/reshaped elbow, respectively. The discriminated power spectra (rotating and plunging components) of the acquired pressure signals on the wall are determined on five levels for seven operating conditions to quantify the influence of the reshaped elbow. The influence of the reshaped elbow on the fundamental frequencies of both rotating and plunging components and on the amplitude of the rotating component is negligible. In contrast, the equivalent amplitude associated with the root mean square of the plunging power spectrum that propagates along the hydraulic passage is mitigated up to 25% by the reshaped geometry of the elbow. The equivalent amplitude on the narrow band around the fundamental frequency of the plunging component is diminished with 40–50% by reshaping the elbow geometry of the simplified draft tube.

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Section: Variable Operating Conditionsmentioning

confidence: 99%

“…The standard deviation corresponding to the random uncertainties of the experimental data increases with the reduction of the rotor speed. This effect is the consequence of the behavior of the magneto-rheological fluid under the influence of the magnetic field installed in the braking device [70,71].…”

Section: Variable Operating Conditionsmentioning

confidence: 99%

Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube

2021

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“…They consist of non-colloidal ferromagnetic particles, dispersed in a non-magnetic base liquid in a volume concentration of 10-50%. The possibility of adapting the behavior of MRFs using magnetic fields of moderate intensities motivates their use in various applications of active vibration control or torque transmission, from many branches of engineering and biomedical [1], [2], [3], [4], [5], [6], [7], [8]:…”

Section: Introductionmentioning

confidence: 99%

Correlation of Rheological Properties of Ferrofluid-Based Magnetorheological Fluids Using Some Dimensionless Numbers Defined in Magnetorheology

Gheorghe-Orlando

Susan-Resiga

2021

Annals of West University of Timisoara - Physics

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In this paper we investigated from rheological point of view some samples of ferrofluid-based magnetorheological fluids (FF-MRFs) with different volumic fractions of Fe microparticles, but with the same ferrofluid used as carrier liquid. We correlated the dimensionless flow curves, measured at different values of the magnetic field induction, using either Mason number or Casson number. It has been shown that in this approach, data sets measured under different conditions collapse on a single curve. This master curve is useful for controlling the concentration of Fe particles, so that the magnetic and magnetorheological properties of FF-MRF to be adapted to obtain high-performance applications.

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“…Vibration control of flexible structures [1], in particular of semi-active protection systems of buildings [2][3][4] and bridges [5], as well as of semi-active control devices for hydraulic machines [6,7] generate specific requirements for suitable MR fluids for both kind of devices.…”

Section: Introductionmentioning

confidence: 99%

From high colloidal stability ferrofluids to magnetorheological fluids: tuning the flow behavior by magnetite nanoclusters

Susan-Resiga

Socoliuc

Bunge

et al. 2019

Smart Mater. Struct.

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The flow behavior of practically structureless ferrofluids was tuned over a large range by adding well-defined amounts of magnetite nanoparticle clusters. Magnetite nanoparticle clusters with hydrophobic coating were dispersed in high colloidal stability transformer oil based ferrofluid samples, initially free of clusters. The resulting ferrofluid composition consists both of single (approx. 7 nm mean size) and clustered (280 nm average size) magnetite nanoparticles, each of them in a prescribed amount. This new approach allows a precise evaluation of the role of clusters on the ferrofluid flow behavior. The magnetite nanoparticle clusters obtained by a solvothermal method have a saturation magnetization of 75 emu g −1 and a remnant magnetization of 0.2 emu g −1 due to the large size (∼25 nm) of the magnetite nanoparticles in their composition. Long bundles of thin elongated needle like aggregates of magnetic nanocluster particles are formed in a magnetic field and produce a significant magnetorheological response of the bidisperse magnetic suspensions observed already for moderate applied magnetic field values. The dynamic yield stress and magnetoviscous effect are analyzed and compared with previous results concerning suspensions of micrometer size iron particles in a ferrofluid carrier. The viscoelastic properties and the interactions between the components of ferrofluid based magnetite nanoparticle cluster suspensions were evaluated by creep tests in zero and non-zero applied magnetic field. The bidisperse magnetic nanocomposite suspensions investigated provide a promising new formulation of MR fluids with improved kinetic stability to be used in seismic dampers and flow control devices.

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Experimental Investigations of a Magneto-Rheological Brake Embedded in a Swirl Generator Apparatus

Cited by 5 publications

References 26 publications

Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube

Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube

Correlation of Rheological Properties of Ferrofluid-Based Magnetorheological Fluids Using Some Dimensionless Numbers Defined in Magnetorheology

From high colloidal stability ferrofluids to magnetorheological fluids: tuning the flow behavior by magnetite nanoclusters

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