Absorption of Sound in Sediments of Small Particles in Liquids
- 1 December 1958
- journal article
- Published by IOP Publishing in Proceedings of the Physical Society
- Vol. 72 (6) , 933-939
- https://doi.org/10.1088/0370-1328/72/6/301
Abstract
The absorption of sound in sediments of particles in different liquids is investigated as the particle size is varied. A pulse method is used at a constant frequency of 1 Mc/s. The sediments consist of small glass spheres of uniform size, eight different particle sizes in the range from 0.0035 cm to 0.016 cm radius being used in each liquid. The liquids used are water, carbon tetrachloride, benzene and castor oil. It is found that in all cases the absorption coefficient can be represented by an expression of the form 2α = k1a3 + k2/a + k3/a2 where k1, k2 and k3 are constants which vary with the liquid used. Some support for an equation of this form is obtained from Sewell's equation applicable to particles suspended in a fluid. At large particle sizes the most important term is k1a3 which is due to scattering losses whereas at small particle sizes the last two terms due to viscous losses predominate. Where the k3 term is significant it is found to be negative, the viscous absorption rising to a maximum and decreasing sharply as the particle size diminishes.Keywords
This publication has 4 references indexed in Scilit:
- The Propagation of Ultrasonics in Suspensions of Particles in a LiquidProceedings of the Physical Society. Section B, 1956
- On the Pulse Method of Measuring Ultrasonic Absorption in LiquidsProceedings of the Physical Society. Section B, 1949
- Ultrasonic Propagation in Liquids: I. Application of Pulse Technique to Velocity and Absorption Measurements at 15 MegacyclesThe Journal of Chemical Physics, 1946
- VII. The extinction of sound in a viscous atmosphere by small obstacles of cylindrical and spherical formPhilosophical Transactions of the Royal Society A, 1911