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Uncertainties in ultrasonic particle sizing in solid-in-liquid suspensions
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 13, 2014
Summary
Estimating particle size distributions (PSDs) using ultrasonic attenuation is sensitive to assumptions about particle number versus volume. Accurate density values are crucial for reliable PSD estimation, especially for small silica particles in water.
Area of Science:
- Materials Science
- Acoustics
- Physical Chemistry
Background:
- Ultrasonic attenuation measurements offer a method for determining particle size distributions (PSDs) in suspensions.
- This technique involves fitting simulated attenuation data to experimental measurements.
Purpose of the Study:
- To investigate uncertainties in PSD estimation arising from different candidate PSD types (volume vs. number).
- To analyze the impact of physical property variations on PSD estimation accuracy.
Main Methods:
- Simulating ultrasonic attenuation based on candidate PSDs and wave propagation models.
- Performing fitting procedures to match simulated and measured attenuation.
- Evaluating sensitivity to various physical properties of suspended particles.
Main Results:
- Uncertainty in PSD type (volume or number fraction) significantly affects median particle size estimation.
- Particle sizing is largely insensitive to most physical properties except density.
- Accurate density values are required, comparable to the precision needed for median size and standard deviation.
Conclusions:
- Careful consideration of PSD representation (volume vs. number) is essential for accurate ultrasonic particle sizing.
- Density is the most critical physical property for accurate PSD estimation via ultrasonic attenuation.
- The findings are particularly relevant for sub-micron silica particles in aqueous suspensions but have broader applicability.
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