Determination of the Strength of Water Suspensions Using a Microwave Bridge Technique*

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Abstract
An analytical expression relating the suspension strength to the individual attenuation coefficients of the host and included media is derived. This is based on a simple model of a dilute suspension derived from Wieners dielectric mixture theory assuming no interaction between electric fields in the host medium and spherical inclusions. The suspension layer is presented in the form of two separate layers: one containing only the dry included substance and the second containing only the host medium. The layer thicknesses are proportional to the volume of each of the components in the suspension. Experimental results for milk and clay-sand slurry are in good agreement with results predicted by the approximate theory for suspension strengths between 0.1 and 0.7. This range of validity for the approximate theory is much wider than that allowed by the definition of a diulte suspension.

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