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Directory:Electrorheology

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Can Electrorheaology Boost Mileage?


Directory page for Electro - Rhealogy technologies and resources.

Rheology is defined as the science of the deformation and flow of matter. This involves the study of what can informally be called "funny fluids" and soft solids. In theory it could include the study of all materials that deform or flow but, by convention, classical (Hookean) elastic solids and viscous (Newtonian) liquids are excluded. Both non-Newtonian and elastic liquids and viscoelastic solids are included in the science.

Resent research by researchers at Temple University in Philadelphia suggest a method by which electrorheology could be used to boost fuel efficiency by up to 20%. Their small device consists of an electrically charged tube that can be attached to the fuel line of a car's engine near the fuel injector. With the use of a power supply from the vehicle's battery, the device creates an electric field that thins fuel, or reduces its viscosity, so that smaller droplets are injected into the engine. That leads to more efficient and cleaner combustion than a standard fuel injector. [1]

Contents

Overviews

Magneto-Rheological Animation (Lord)
Magneto-Rheological Animation (Lord)
"Scientists and engineers are most familiar with single-crystal or polycrystialline field-responsive materials responses typically occurring while the materials remain in the solid state. These materials demonstrate dramatic changes in their rheological properties including yield stress, loss and storage moduli etc. in response to an externally applied electric or magnetic field are known as electrorheological fluid (ERF) or magnetorheological fluid (MRF), respectively." (Jong Hyeok Park and O Ok Park
In contrast to electro-rheological (ER) fluids, magneto-rheological (MR) fluids:
  • Are 20-50 times stronger
  • Are significantly less sensitive to contaminants and extremes in temperature
  • Can be operated directly from low-voltage power supplies
  • MR technology can provide flexible control capabilities in designs that are far less complicated and more reliable than those based on ER technology. (Lord)

Products in the Marketplace

  • Electro rheology cell - The electro-rheology cell allows the characterization of the rheology of samples whilst in an electric field. Typical applications are electro-rheological fluids used for creating a physical resistance, liquid crystals and other electrically sensitive samples.

Companies

  • Lord - Applications include automotive primary suspensions; truck seat systems; cab suspensions; control-by-wire and tactile feedback devices (TFD®); seismic mitigation; and human prosthetics.
  • Malvern Instruments - A leading supplier of particle characterization systems that apply advanced technologies such laser diffraction, Zeta potential and submicron particle size measurement, Non-Invasive Back-Scatter (NIBS®) optics and Image analysis.
  • Vilastic Science - "Vilastic Viscoelasticity Analyzers are the most sensitive instruments available for rheological analysis of a wide range of viscous and viscoelastic liquids--even fluids as thin as water--with unparalleled precision." The Vilastic VE System generates a longitudinal oscillatory flow in the channel. The shear stress, strain, and shear rate at the channel walls are determined from measurements of the oscillatory pressure and volume flow.<br style="clear:right;"

Patents


Abstract
In an electro-rheological composition comprising an electrical insulating medium and solid particles dispersed therein, insulating solid particles possessed of morphological anisotropy are used as the solid particles. In a preferred embodiment, the insulating solid particles mentioned above are plate-like insulating solid particles, preferably plate-like insulating solid particles having a diameter (particle diameter) not less than 1 μm, more preferably plate-like aluminum oxide particles having a diameter not less than 1 μm. In another preferred embodiment, the insulating solid particles which have undergone a surface treatment with organic molecules or a semiconducting inorganic material, particularly the insulating solid particles having a metal oxide such as tin oxide and titanium oxide adhered to the surfaces thereof are used as the particles. Still another preferred embodiment is the ER composition of which electrical insulating medium is gelled.


Abstract
A homogeneous electro rheological fluid of the invention comprises a poly( alpha -amino acid) or a poly( gamma -glutamate), and an electric insulating liquid in a specific amount. To provide a homogeneous electro rheological fluid of good stability, with long lasting and consistent performance in the presence of a trace of water. The fluid also exerts a good electro rheological effect wherein a hydrocarbon oil or an ester-type oil is used as an electric insulating liquid.

Research and Development

Skeptics


Coverage

Scientific Papers

In the News

  • ELECTRO-RHEOLOGICAL FLUIDS AND MAGNETO-RHEOLOGICAL SUSPENSIONS - Electrorheological (ER) and magnetorheological (MR) fluids, which can be transformed from the liquid state into the solid state in milliseconds by applying an electric or a magnetic field, are smart fluids having the potential to revolutionize several industrial sectors. (World Scientific; July 23, 1999)

Discussion

See Discussion page

Directories

  • British Society of Rheology - The BSR runs scientific meetings and meetings of the Non-Newtonian Club, and provides many other services to its members. Student members are invited to apply for travel awards, and each year we hold a competition for the best Ph.D. thesis in rheology, awarding the Vernon Harrison Prize.
  • ELECTRORHEOLOGICAL FLUIDS, 22 - The major objective of Electrorheological Fluids is to present a comprehensive survey on the ER suspensions in term of screening high performance ER materials, physical mechanisms of the ER effect, and the applications of ER technology. (Elsevier book; Sept. 27, 2008)

See also


- Other Directory listings • Latest • A-I • J-R • S-Z • Tree • News
- PESWiki home page

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