31. The friction factor for laminar flow of Newtonian fluids in round tubes is often taken to be: 32. For some fluids, viscosity is a constant over a wide range of shear rates ( Newtonian fluids ). 33. If n = 1 and \ tau _ 0 = 0, this model reduces to the Newtonian fluid . 34. This power law model represents a type of non-Newtonian fluid relating shear rate and sheer stress with viscosity. 35. It is a non-Newtonian fluid , and if it is allowed to cool below 30 �C, it will'set '. 36. Golden syrup is a Newtonian fluid . 37. Such fluids are called Newtonian fluids . 38. The modelling system is based on the conservation of mass and momentum in three dimensions of a Newtonian fluid . 39. Most research at this point has been done on what are known as Newtonian fluids _ water, oil and alcohol. 40. Recalling that \ sigma =-\ pi I + \ boldsymbol \ tau, for a Newtonian fluid the stress tensor is:
