Definitions for "Newtonian flow"
see Newtonian fluid.
Occurs in a liquid system where the rate of shear is directly proportional to the shearing force, as with straight grade oils which do not contain polymeric viscosity modifier. When rate of shear is not directly proportional to the shearing force, flow is non-Newtonian, as it is with oils containing viscosity modifiers.
the type of flow occurring in a liquid system in which shear rate is directly proportional to the shearing force. Newtonian fluids will always have the same viscosity. Mineral oils, for example, exhibit this type of flow at low shear rates.