Dynamic viscosity of air11/4/2022 Let us see the figure 2.12 as an example. Additionally, the degree of velocity variation against distance is called “ velocity gradient”, and its unit is. This friction is called “ shear stress” and its unit is. Want to know more Units of viscosity and kinematic viscosity coefficientīecause a fluid has viscosity, friction occurs between two fluids or between a fluid and a solid. It is derived by dividing viscosity by density, and its unit is. Here, a measure called “ kinematic viscosity coefficient” is used. Even if brakes at the same power are applied to both, they will stop differently because they have different weights.įigure 2.11 Weight and braking effectivenessĪs we have seen above, to consider how viscosity effects a flow, we need to know the density of the fluid. For example, let us see a bicycle and a truck running at the same speed. Viscosity works as a brake to a flow, and the effectiveness of the brake depends on the density of a fluid. In most cases, liquids have larger viscosity coefficients than gases because links of molecules are tighter in liquids than in gases. When force is applied and relative relation of molecular position is to be broken, molecules try to stay at their fixed positions. We can see the viscosity coefficient of oil is 60 to 80 times as large as that of water. They are approximately 0.001016 for water and 0.06 to 0.08 for oil. Let us compare their viscosity coefficients. We feel that cooking oil is stickier than water at 20☌. Viscosity coefficient is the degree of fluid stickiness and its unit is. 2.6 Viscosity and kinematic viscosity coefficient Fluid
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