## Newtonian Fluids

Newtonian fluids are those in which the viscosity remains constant for all shear rates providing temperature and pressure conditions remain constant. Examples of Newtonian fluids are water, glycerine and light oil. In these fluids, the shear stress is directly proportional to the shear rate, as shown in Figure 3. The rheogram curve of a Newtonian fluid is a straight line passing through the origin. The origin is the starting point on the graph of both the vertical and horizontal axes. The slope of the curve defines viscosity where g is the shear rate and t is the shear stress. Because m (viscosity) does not change with rate of shear, it is the only parameter needed to characterize the flow properties of a Newtonian fluid. Most drilling fluids are not this simple.

Figure 3

Rheogram Showing Newtonian Fluid Behavior

Figure 3

Rheogram Showing Newtonian Fluid Behavior

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