is the rate at which a shear
The shear rate for a fluid flowing between two parallel plates, one moving at a constant speed and the other one stationary (Couette_flow
}, is defined by
<math> dot gamma = frac </math>
- <math>dotgamma</math> = The shear rate, measured in reciprocal seconds
- <math>v </math> = The velocity of the moving plate, measured in meters per second
- <math>h </math> = The distance between the two parallel plates, measured in meters
Or,<math>dot gamma_=frac + frac </math>
For the simple shear
case, it is just a gradient
in a flowing material. The SI unit
of measurement for shear rate is sec<sup>-1</sup>, expressed as "reciprocal seconds" or "inverse seconds."
The shear rate at the inner wall of a Newtonian fluid
flowing within a pipeRon Darby, Chemical engineering fluid mechanics
, 2nd ed. CRC Press, 2001, is:
- <math> dot gamma = frac </math>
- <math>dotgamma</math> = The shear rate, measured in reciprocal seconds.
- <math>v </math> = The linear fluid velocity.
- <math>d </math> = The inside diameter of the pipe.
The linear fluid velocity v
is related to the volumetric flow rate Q
- <math>v = frac</math>
where A is the cross-sectional area of the pipe, which... Read More