Ultrasonic dispersion of soil in water: the effect of suspension properties on energy dissipation and soil dispersion

Raine, S.R.; So, H.B.

Australian Journal of Soil Research 32(6): 1157-1174


DOI: 10.1071/sr9941157
Accession: 002726256

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The effect of suspension concentration, suspension volume, gas saturation, depth of ultrasonic probe insertion and particle size distribution on the power (energy per unit time) applied by an ultrasonic probe was investigated. Suspension concentration, suspension volume, gas saturation and method of wetting the soil on the dispersion produced by ultrasonic energy applications was also investigated. The tests were carried out on five Vertisols from eastern Australia. Where the power applied was expressed per unit soil mass the quantity of dispersed material released by ultrasonic action was not affected by the volume or concentration of the suspension. A decrease in the dissolved gas concentration in suspension decreased the dispersion produced. The method of soil wetting significantly affected initial disruption but had no effect on the maximum amount of <2 and <20 micro m material produced by sonification. The power applied by the ultrasonic probe decreased with suspension temperature, increased with dissolved gas concentration and with the depth of probe insertion. Recommendations are made on the range of suspension properties that should be used for standard measurements of aggregate stability assessment using ultrasonic energy.