Chemical Engineering - Chemical Engineering Basics - Discussion

Discussion Forum : Chemical Engineering Basics - Section 5 (Q.No. 7)
7.
Unit of viscosity in CGS system is
gm .cm-1 sec-1
gm . cm2 . sec-2
gm .cm-2, sec-1
gm . cm . sec-1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
1 comments Page 1 of 1.

RATAN CHANDRA BERA said:   1 decade ago
The magnitude F of this force is found to be proportional to the speed u and the area A of each plate, and inversely proportional to their separation y. That is,

F=mu A frac{u}{y}

The proportionality factor μ in this formula is the viscosity (specifically, the dynamic viscosity) of the fluid.

The ratio u/y is called the rate of shear deformation or shear velocity, and is the derivative of the fluid speed in the direction perpendicular to the plates. Isaac Newton expressed the viscous forces by the differential equation

tau=mu frac{partial u}{partial y}

where tau = F/A and {partial u}/{partial y} is the local shear velocity. This formula assumes that the flow is moving along parallel lines and the y axis, perpendicular to the flow, points in the direction of maximum shear velocity. This equation can be used where the velocity does not vary linearly with y, such as in fluid flowing through a pipe.

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