Abstract
We introduce medical ultrasound as a tool to measure properties of particulate suspensions such as the elastic modulus and the porosity of microparticles in the suspensions. More importantly, since dense suspensions are in general optically opaque, it is difficult to directly observe flows deep inside. Ultrasound imaging can solve this problem. By pushing the frame rate of the ultrasound to 10,000 frames per second, we were able to study the flows inside dense suspensions with sufficient spatial and temporal resolutions. In this chapter, we introduce our ultrasound system, show results from multiple calibrations, and describe technical details on how we performed measurements of the flow.
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Notes
- 1.
Here “couple” means that the acoustic impedance is matched. Details see Sect. 2.6.
- 2.
Gassmann’s equation applies in the “low frequency limit,” which means that the time for the pore pressure to equilibrate is sufficiently long [85, 86]. Though the central frequency of our ultrasound signal was 5 MHz, which is not normally considered a “low frequency” wave, we could still use this equation reasonably, because the cornstarch particles are small (∼ 10 μm) and permeable, thus the time it takes for the Biot wave to diffuse through the whole particle is sufficiently short.
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Han, E. (2020). Ultrasound Techniques for Studying Suspensions. In: Transient Dynamics of Concentrated Particulate Suspensions Under Shear. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-38348-0_2
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