BS ISO 20998-3:2017
$167.15
Measurement and characterization of particles by acoustic methods – Guidelines for non-linear theory
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 36 |
This document gives guidelines for ultrasonic attenuation spectroscopy methods for determining the size distributions of one or more material phases dispersed in a liquid at high concentrations, where the ultrasonic attenuation spectrum is not a linear function of the particle volume fraction. In this regime, particle-particle interactions are not negligible.
This document is applicable to colloids, dispersions, slurries, and emulsions. The typical particle size for such analysis ranges from 10 nm to 3 mm, although particles outside this range have also been successfully measured. Measurements can be made for concentrations of the dispersed phase ranging from about 5 % by volume to over 50 % by volume, depending on the density contrast between the continuous and the dispersed phases, the particle size, and the frequency range[ 9 ] [ 10 ]. These ultrasonic methods can be used to monitor dynamic changes in the size distribution, including agglomeration or flocculation.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and abbreviated terms |
| 11 | 5 Limits of applicability of linear theory 5.1 Multiple scattering 5.2 Concentration considerations |
| 14 | 5.3 Steric repulsion |
| 15 | 6 Measurement issues in concentrated systems 6.1 General 6.2 Path length limitation 6.3 High attenuation 6.4 Increased viscosity 6.5 Change in velocity |
| 16 | 6.6 Change in pulse shape 6.7 Homogeneity 7 Nonlinear attenuation 8 Determination of particle size 8.1 Calculation |
| 17 | 8.2 Limits of application 9 Instrument qualification 9.1 Calibration 9.2 Precision 9.2.1 Reference materials 9.2.2 Repeatability 9.2.3 Reproducibility 9.3 Accuracy 9.3.1 Qualification procedure |
| 18 | 9.3.2 Reference materials 9.3.3 Instrument preparation 9.3.4 Accuracy test 9.3.5 Qualification acceptance criteria 10 Reporting of results |
| 19 | Annex A (informative) Theories of attenuation in concentrated systems |
| 22 | Annex B (informative) Practical example of PSD measurement (coupled phase model) |
| 30 | Bibliography |
