Determination of flow rate of viscoplastic fluids in annuli using an additive method

Abstract eng:
An additive method enabling a direct determination of axial flow rate for viscous (power-law model) and viscoplastic (Vo adlo model) fluids in concentric annuli is presented. Flow rate through the actual concentric annulus is possible to express as a sum of axial flow rates through individual partial concentric annuli forming the whole annulus. The resulting relation for axial flow rate is possible to express in analytical forms without necessity of otherwise complicated derivations. The only numerical calculation consists in a determination of location of a zero shear stress for the original whole concentric annulus.

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