Newtonian and non-Newtonian fluids in recent years caused an active interest not only to scientists, but also ordinary people.This is due to the fact that non-Newtonian liquid is easily made with his hands and suitable for home runs.To begin with we shall understand that it's all for such substances.Newtonian fluid obeys Newton's viscous friction, and therefore got its name.According to this law, the shear stress in the plane of contact between layers of liquid is directly proportional to the derivative of the speed of its flow in the direction normal to these planes.
Sounds pretty complicated, but the reader will be better understood, if we say that the Newtonian fluid - water, oil and most familiar to us in daily use of fluids, that is, those that retain their physical state that you would withthey do not (except in the case of the evaporation or freezing, of course).But if the relationship described in the definition above, is inversely proportional to, we can speak of a non-Newtonian fluid.
This liquid is always homogeneous, it has a larger molecules assemble into crystalline lattice, so the viscosity depends on the flow rate of the connection.The higher the speed, the higher the viscosity.In part, this type compounds include thixotropic liquid, that is, those that change viscosity over time, such as putty or chocolate.Also, some scholars are inclined to believe the blood of a substance does not act according to the laws of Newton's viscous friction, because it is non-homogeneous fluid, it is a suspension of plasma and a variety of blood cells.Any doctor confirms that the viscosity of the blood may vary in different areas of the vascular system, which is often the pathology.However, not every substance is in principle capable of such a metamorphosis.
non-Newtonian fluids can be prepared at home very easily.We need to take 1.5 parts of starch (ideally corn, potato and fine), and one part water.The ingredients should be mixed slowly so as to avoid lumps.Ideally, it is enough to distribute a thin layer on a baking sheet, but, of course, you can experience any interaction.Try to quickly "rake" liquid fingers, and it will look and feel like a frozen mass of plastic.Relax your toes - and the liquid will flow.Newtonian fluid is not capable of such tricks!You can dial a substance in a handful of pop and start it up.Very soon it will become sticky and malleable, so if zaplyashet in your hands - this is a very interesting sight!Roll up the liquid into a ball, it is elastic and enjoyable and worth to relax his hand - will be spread.It is interesting to add it dyes to play with the children.Some go even further and try to run on non-Newtonian fluid, roll on it, and other things, but for such experiments, of course, need much more material than for home runs.You can find plenty of video reports and to continue to explore the fascinating world of physics.
