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Advantages of acoustics
Within a certain frequency range, the ultrasonic wave propagation though a suspension is influenced only by the viscous and thermal properties of colloidal suspensions.
- The frequency range for viscous effects varies from 1-10MHz.
- The shear viscosity, dynamic viscosity and visco-elastic moduli are calculated from the attenuation of the output wave, and sound velocity.
- This technique has distinctive advantages as it can be applied in frequency regions where viscous and scattering effects occur independently so reliable rheological calculations can be performed.
Measurements can be taken in real-time without disturbing the flow of the Colloid suspension. Therefore, it can be employed for bio-process monitoring as non-destructive testing. Real-time signals are obtained through continuous or pulsed propagation in-line, and/or in-situ.
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