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phy131studiof16:lectures:chapter13 [2016/10/28 09:37] mdawber [Poiseulle's equation] |
phy131studiof16:lectures:chapter13 [2016/10/28 09:38] (current) mdawber [Viscosity] |
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{{viscosity.png}} | {{viscosity.png}} | ||

- | Viscosity can be defined from looking at a fluid trapped between two plates in which one plate moves with velocity $v$ with respect to the other. The fluid in contact with each plate must have the same velocity as the plate it is in contact with and the fluid in between is subject to a velocity gradient. The viscosity $\eta$ is defined in terms of the force require to maintain that velocity gradient (which is required to move the plate). In the following equation $A$ is the area of the plate. | + | Viscosity can be defined from looking at a fluid trapped between two plates in which one plate moves with velocity $v$ with respect to the other. The fluid in contact with each plate must have the same velocity as the plate it is in contact with and the fluid in between is subject to a velocity gradient. The viscosity $\eta$ $(\mathrm{N\,s\,m^{-2}})$ is defined in terms of the force require to maintain that velocity gradient (which is required to move the plate). In the following equation $A$ is the area of the plate. |

$F=\eta A\frac{v}{l}$ | $F=\eta A\frac{v}{l}$ |