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Measuring particle concentration in multiphase pipe flow using acoustic backscatter: generalization of the
Hugh P Rice1, Michael Fairweather1, Timothy N Hunter1
1School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
The Journal of the Acoustical Society of America
|July 5, 2014
Summary
This study presents a new ultrasonic method to measure particle concentration in suspensions. The technique accurately determines acoustic properties, enabling real-time monitoring of settling and segregation in industrial slurries.
Area of Science:
- Fluid dynamics
- Acoustics
- Materials science
Background:
- Accurate measurement of particle concentration in suspensions is crucial for industrial processes.
- Existing methods for determining acoustic properties of suspensions are limited.
- Ultrasonic dual-frequency inversion requires knowledge of acoustic attenuation and backscattering coefficients.
Purpose of the Study:
- To present a novel technique for determining acoustic attenuation and backscattering coefficients of particle suspensions.
- To adapt an earlier method for marine sediments to general engineering materials.
- To demonstrate the application of an ultrasonic dual-frequency inversion method for particle concentration profiling.
Main Methods:
- Extension of an earlier technique for marine sediments.
- Measurement of acoustic attenuation and backscattering coefficients for suspensions.
- Application of ultrasonic dual-frequency inversion in the megahertz range.
- Calculation of particle concentration profiles in turbulent pipe flow.
Main Results:
- The technique successfully determines acoustic coefficients for various particle materials.
- Observed trends in coefficients align with estimates based on quartz sand data.
- Calculated concentration profiles reveal settling and segregation behavior.
- The method distinguishes between homogeneous, heterogeneous, and bed-forming flow regimes.
Conclusions:
- The presented ultrasonic method has significant potential for measuring suspension behavior in engineering applications.
- This technique can be applied in industries such as nuclear processing and mineral extraction.
- It offers a non-invasive way to monitor slurry dynamics and flow regimes.
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