Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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TL;DR: In this article, a review of various types of electro-or magneto-responsive materials from either polymeric or inorganic and hybrid composite materials is presented, and the fabrication strategies for ER/MR candidates and their ER and magnetorheological characteristics are also included.
Abstract: Electrorheological (ER) and magnetorheological (MR) suspensions undergo a reverse phase transition from a liquid-like to solid-like state in response to an external electric or magnetic field, respectively. This paper briefly reviews various types of electro- or magneto-responsive materials from either polymeric or inorganic and hybrid composite materials. The fabrication strategies for ER/MR candidates and their ER/MR characteristics (particularly for ER fluids) are also included.
40 citations
TL;DR: A simple model is presented to describe this crossover as a function of the slit thickness and volume fraction of the MR fluid, and it is shown quantitatively how energy barriers to structure formation play a crucial role in determining the steady state structure of these systems.
Abstract: We study the effects of extreme confinement on the self assembly of the colloids found in magnetorheological (MR) fluids using Brownian dynamics simulations The MR fluid is confined in a thin slit with a uniform external magnetic field directed normal to the slit We find a crossover in the behavior of the system from two dimensions to three dimensions as the slit thickness is increased A simple model is presented to describe this crossover as a function of the slit thickness and volume fraction of the MR fluid The model is able to predict the salient features of the structure formation that has been observed in these systems Furthermore, the model predicts the approximate time scales for structure formation under a variety of conditions We present a quantitative analysis of the effect of volume fraction on the behavior of the system Additionally, we show quantitatively how energy barriers to structure formation play a crucial role in determining the steady state structure of these systems Our analysis explains the discrepancies between previous experimental and theoretical work on the self-assembly of MR fluids confined in thin slits
40 citations
TL;DR: In this article, a mathematical model for the MR valve is developed and the simulation is carried out to evaluate the newly developed MR valve and the results of analysis are presented in terms of magnetic strength H and magnetic flux density B.
Abstract: Magneto-rheological (MR) valve is one of the devices generally used to control the speed of Hydraulic actuator of MR fluid. The performance of valve depends on the magnetic circuit design. Present study deals with a new design of MR valve. A mathematical model for the MR valve is developed and the simulation is carried out to evaluate the newly developed MR valve. The design of the magnetic circuit is accomplished by magnetic finite element software such as Finite Element Method Magnetic (FEMMR). The model dimensions of MR valve, material properties are taken into account. The results of analysis are presented in terms of magnetic strength H and magnetic flux density B. The simulation results based on the proposed model indicate that the efficiency of the proposed MR valve is superior to two other types of MR valves, under the same magnetic flux density. As a conclusion, the new valve design has improved the efficiency of MR valve significantly.
40 citations
TL;DR: In this article, an influence of carbonyl iron (CI) particles' corrosion on magnetorheological performance of their silicone-oil suspensions was investigated, which showed lower values of the yield stress, which was significantly manifested at higher magnetic field intensities due to lower saturation magnetization of the particles.
40 citations
TL;DR: In this article, a new type of magnetorheological materials consisting of small amounts of magnetic nanoparticles (0.8 Wt ) but exhibiting large rheological change (i.e., a gel-sol transition) upon the application of a small magnetic field was reported.
40 citations