Grasping the behavior of magnetorheological fluids in gradient pinch mode via microscopic imaging

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F24%3APU151142" target="_blank" >RIV/00216305:26210/24:PU151142 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/70883521:28110/24:63579538 RIV/70883521:28610/24:63579538

Výsledek na webu

<a href="https://pubs.aip.org/aip/pof/article/36/4/042004/3280712/Grasping-the-behavior-of-magnetorheological-fluids" target="_blank" >https://pubs.aip.org/aip/pof/article/36/4/042004/3280712/Grasping-the-behavior-of-magnetorheological-fluids</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0203804" target="_blank" >10.1063/5.0203804</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Grasping the behavior of magnetorheological fluids in gradient pinch mode via microscopic imaging

Popis výsledku v původním jazyce

Magnetorheological (MR) fluids are suspensions of micrometer-sized ferromagnetic particles in a carrier fluid, which react to magnetic fields. The fluids can be operated in several fundamental modes. Contrary to the other modes, the rheology and microstructure formation of the MR fluid in the gradient pinch mode have been studied to a far lesser extent. The magnetic field distribution in the flow channel is intentionally made non-uniform. It is hypothesized that the Venturi-like contraction is achieved via fluid property changes, leading to a unique behavior and the presence of a pseudo-orifice. The main goal is to investigate the presence of the Venturi-like contraction effect in the fluid by means of optical imaging and hydraulic measurements. To accomplish the goal, a unique test rig has been developed including a fluorescence microscope and MR valve prototype. The Venturi-like contraction hypothesis was confirmed. The results indicate that the effective flow channel size decreases by 92% at the maximum magnetic flux applied. This has a direct impact on the flow characteristics of the MR valve. The variation of the pressure–flow rate curve slope with magnetic field was demonstrated. The results provide valuable information for understanding the rheology and microstructure formation mechanism in MR fluids in the pinch mode.

Název v anglickém jazyce

Grasping the behavior of magnetorheological fluids in gradient pinch mode via microscopic imaging

Popis výsledku anglicky

Magnetorheological (MR) fluids are suspensions of micrometer-sized ferromagnetic particles in a carrier fluid, which react to magnetic fields. The fluids can be operated in several fundamental modes. Contrary to the other modes, the rheology and microstructure formation of the MR fluid in the gradient pinch mode have been studied to a far lesser extent. The magnetic field distribution in the flow channel is intentionally made non-uniform. It is hypothesized that the Venturi-like contraction is achieved via fluid property changes, leading to a unique behavior and the presence of a pseudo-orifice. The main goal is to investigate the presence of the Venturi-like contraction effect in the fluid by means of optical imaging and hydraulic measurements. To accomplish the goal, a unique test rig has been developed including a fluorescence microscope and MR valve prototype. The Venturi-like contraction hypothesis was confirmed. The results indicate that the effective flow channel size decreases by 92% at the maximum magnetic flux applied. This has a direct impact on the flow characteristics of the MR valve. The variation of the pressure–flow rate curve slope with magnetic field was demonstrated. The results provide valuable information for understanding the rheology and microstructure formation mechanism in MR fluids in the pinch mode.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GF21-45236L" target="_blank" >GF21-45236L: Reologie magnetoreologických kapalin v neuniformních magnetických polích - režim sevření</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

PHYSICS OF FLUIDS

ISSN

1070-6631

e-ISSN

1089-7666

Svazek periodika

36

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

„042004-1“-„042004-10“

Kód UT WoS článku

001196145700012

EID výsledku v databázi Scopus

2-s2.0-85189666443