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apparent viscosity

1. n. [Drilling Fluids]

The viscosity of a fluid measured at a given shear rate at a fixed temperature. In order for a viscosity measurement to be meaningful, the shear rate must be stated or defined.

Alternate Form: AV

2. n. [Drilling Fluids]

The viscosity of a fluid measured at the shear rate specified by API. In the Bingham plastic rheology model, apparent viscosity (AV) is one-half of the dial reading at 600 rpm (1,022 sec–1 shear rate) using a direct-indicating, rotational viscometer. For example, a 600-rpm dial reading is 50 and the AV is 50/2, or 25 cP.

See: APIBingham plastic modelcentipoiseplastic viscosityrheologyshear rateyield point

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