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- Acoustic_rheometer abstract "An acoustic rheometer employs piezo-electric crystal that can easily launch a successive wave of extensions and contractions into the fluid. It applies an oscillating extensional stress to the system. System response can be interpreted in terms of extensional rheology.This interpretation is based on a link between shear rheology, extensional rheology and acoustics. Relationship between these scientific disciplines was described in details by Litovitz and Davis in 1964.It is well known that properties of viscoelastic fluid are characterised in shear rheology with a shear modulus G, which links shear stress Tij and shear strain SijThere is similar linear relationship in extensional rheology between extensional stress P, extensional strain S and extensional modulus K:Detail theoretical analysis indicates that propagation of sound or ultrasound through a viscoelastic fluid depends on both shear modulus G and extensional modulus K,. It is convenient to introduce a combined longitudinal modulus M:There are simple equations that express longitudinal modulus in terms of acoustic properties, sound speed V and attenuation αAcoustic rheometer measures sound speed and attenuation of ultrasound for a set of frequencies in the megahertz range. These measurable parameters can be converted into real and imaginary components of longitudinal modulus. Sound speed determines M', which is a measure of system elasticity. It can be converted into fluid compressibility.Attenuation determines M", which is a measure of viscous properties, energy dissipation. This parameter can be considered as extensional viscosityIn the case of Newtonian liquid attenuation yields information on the volume viscosity. Stokes' law (sound attenuation) provides relationship among attenuation, dynamic viscosity and volume viscosity of the Newtonian fluid.This type of rheometer works at much higher frequencies than others. It is suitable for studying effects with much shorter relaxation times than any other rheometer.".
- Acoustic_rheometer wikiPageID "13808007".
- Acoustic_rheometer wikiPageRevisionID "482981894".
- Acoustic_rheometer hasPhotoCollection Acoustic_rheometer.
- Acoustic_rheometer subject Category:Fluid_dynamics.
- Acoustic_rheometer subject Category:Measuring_instruments.
- Acoustic_rheometer type Artifact100021939.
- Acoustic_rheometer type Device103183080.
- Acoustic_rheometer type Instrument103574816.
- Acoustic_rheometer type Instrumentality103575240.
- Acoustic_rheometer type MeasuringInstrument103733925.
- Acoustic_rheometer type MeasuringInstruments.
- Acoustic_rheometer type Object100002684.
- Acoustic_rheometer type PhysicalEntity100001930.
- Acoustic_rheometer type Whole100003553.
- Acoustic_rheometer comment "An acoustic rheometer employs piezo-electric crystal that can easily launch a successive wave of extensions and contractions into the fluid. It applies an oscillating extensional stress to the system. System response can be interpreted in terms of extensional rheology.This interpretation is based on a link between shear rheology, extensional rheology and acoustics.".
- Acoustic_rheometer label "Acoustic rheometer".
- Acoustic_rheometer sameAs m.03cjvht.
- Acoustic_rheometer sameAs Q4674706.
- Acoustic_rheometer sameAs Q4674706.
- Acoustic_rheometer sameAs Acoustic_rheometer.
- Acoustic_rheometer wasDerivedFrom Acoustic_rheometer?oldid=482981894.
- Acoustic_rheometer isPrimaryTopicOf Acoustic_rheometer.