apparent viscosity definition
This measured viscosity is called the apparent viscosity of the fluid and is accurate only when explicit experimental parameters are furnished and adhered to. Non-Newtonian flow can be envisioned by thinking of any fluid as a mixture of molecules with different shapes and sizes. NOTE Plastic viscosity is calculated by subtracting the 300 r/min concentric cylinder viscometer reading from the 600 r/min concentric cylinder viscometer reading (see ISO 10414-1 and ISO 10414-2). a rheological term taken from the rheometer reading performed by a Mud engineer on drilling fluid and it is expressed in the centipoise. Centipoise is the level of force needed to move one layer of fluid in relation to another. APPARENT VISCOSITY: The apparent viscosity applies to non-Newtonian fluids.. Viscosity is the measure of the internal friction of a fluid. This friction becomes apparent when a layer of fluid is made to move in relation to another layer. The greater the friction, the greater the amount of force required to cause this movement, which is called shear. Viscosity is a principal parameter when any flow measurements of fluids, such as liquids, semi-solids, gases and even solids are made. Brookfield deals with liquids and semi-solids. Viscosity measurements are made in conjunction with product quality and efficiency. apparent viscosity. (fluid mechanics). The value obtained by applying the instrumental equations used in obtaining the viscosity of a Newtonian fluid to viscometer measurements of a non-Newtonian fluid. 1  Facebook. 2  Twitter. (March 2009). The apparent viscosity of a fluid depends on the shear rate at which it is measured. The apparent viscosity of a dilatant fluid is higher when measured at a higher shear rate (η₄ is higher than η₃), while the apparent viscosity of a Bingham plastic is lower (η₂ is lower than η₁). 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 (1022 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. Apparent viscosity (sometimes denoted η) is the shear stress applied to a fluid divided by the shear rate (). For a Newtonian fluid, the apparent viscosity is constant, and equal to the Newtonian viscosity of the fluid, but for non-Newtonian fluids, the apparent viscosity depends on the shear rate. English | Espanol. español. 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
The value obtained by applying the instrumental equations.