Abstract

A new, theoretically more satisfactory, definition for the relative viscosities of suspensions in non-Newtonian media is presented, according to which viscosities of suspension and pure liquid should be compared at equal liquid phase viscosities. Theoretical implications of this definition have been investigated, especially for very dilute suspensions. Rheological data of suspensions in liquids with a wide range of degree of pseudoplasticity have been analysed. According to the new definition the Einstein viscosity coefficient of these suspensions is 2.5 independent of the amount of pseudoplasticity.

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