Publication detail

True pinch mode of magnetorheological fluids

SAPINSKI,B MACHÁČEK, O. KUBÍK, M. GOLDASZ, J BANKOSZ, W ŽÁČEK, J.

Original Title

True pinch mode of magnetorheological fluids

Type

journal article in Web of Science

Language

English

Original Abstract

Magnetorheological (MR) fluids are representatives of smart materials. They react to magnetic fields by developing a yield stress. The effect has been employed in real-world applications such as automotive chassis systems or optical finishing. By convention, MR devices can be operated in at least one of the fundamental modes: flow, shear, squeeze, gradient pinch of which the former has been the least studied and understood. In pinch mode, the material in the flow channel is exposed to non-uniform magnetic fields in the direction parallel to fluid flow. As a result, only the volume of MR fluid near the channel walls are energized to modify the particular material property (yield stress). The result is the channel's effective diameter change. The behavior of the material in pinch mode is unique and unseen in the other controllable fluids. To study the material's characteristics in the specific mode, the authors developed a novel circuit concept for energizing the material in an effort to achieve the 'true-zero' pinch mode magnetic behavior. Contrary to the existing pinch mode valve concepts, the concept valve allows to achieve zero magnetic flux density in the center of the flow channel regardless of the current level. To test the hypothesis a prototype valve was modeled, manufactured and tested across a range of external (flow rate, current/magnetic flux) stimuli. The obtained results yield sufficient evidence proven by results of magnetic simulations to support the underlying hypothesis. The experimental results illustrate the pinch mode type behaviour, i.e. the slope change in the pressure vs flow rate characteristics.

Keywords

magnetorheological

Authors

SAPINSKI,B; MACHÁČEK, O.; KUBÍK, M.; GOLDASZ, J; BANKOSZ, W; ŽÁČEK, J.

Released

29. 10. 2024

Publisher

IOP

ISBN

0964-1726

Periodical

SMART MATERIALS & STRUCTURES

Year of study

33

Number

11

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

11

Pages count

11

URL

https://iopscience.iop.org/article/10.1088/1361-665X/ad88c1

BibTex

@article{BUT190038,
  author="SAPINSKI,B and MACHÁČEK, O. and KUBÍK, M. and GOLDASZ, J and BANKOSZ, W and ŽÁČEK, J.",
  title="True pinch mode of magnetorheological fluids",
  journal="SMART MATERIALS & STRUCTURES",
  year="2024",
  volume="33",
  number="11",
  pages="1--11",
  doi="10.1088/1361-665X/ad88c1",
  issn="0964-1726",
  url="https://iopscience.iop.org/article/10.1088/1361-665X/ad88c1"
}