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单词 Apparent viscosity
释义

Apparent viscosity

英语百科

Apparent viscosity

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).

Apparent viscosity (sometimes denoted η) is the shear stress applied to a fluid divided by the shear rate (\eta = \frac{\tau}{\dot\gamma}). 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. Apparent viscosity has the SI derived unit Pa·s (Pascal-second, but the centipoise is frequently used in practice: (1 mPa·s = 1 cP).

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更新时间:2025/6/22 3:40:14