True pinch mode of magnetorheological fluids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F24%3APU152496" target="_blank" >RIV/00216305:26210/24:PU152496 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-665X/ad88c1" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-665X/ad88c1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-665X/ad88c1" target="_blank" >10.1088/1361-665X/ad88c1</a>

Result language

angličtina

Original language name

True pinch mode of magnetorheological fluids

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20301 - Mechanical engineering

Project

<a href="/en/project/GF21-45236L" target="_blank" >GF21-45236L: Rheology of magnetorheological fluids subjected to non-uniform magnetic fields - pinch mode</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

SMART MATERIALS & STRUCTURES

ISSN

0964-1726

e-ISSN

1361-665X

Volume of the periodical

33

Issue of the periodical within the volume

11

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

1-11

UT code for WoS article

001345804100001

EID of the result in the Scopus database

2-s2.0-85207932340