![]() ![]() The table below summarises four types of non-Newtonian fluids. Some non-Newtonian fluids react as a result of the amount of stress applied, while others react as a result of the length of time that stress is applied. To think of viscosity in everyday terms, the easier a fluid moves, the lower the viscosity. A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. Not all non-Newtonian Fluids behave in the same way when stress is applied – some become more solid, others more fluid. 3,428 Viscosity Formula Viscosity is measured in terms of a ratio of shearing stress to the velocity gradient in a fluid. Viscosity is the measure of resistance of a fluid to flow. This page focuses on how to define viscosity, the different types of viscosity, and the different types of liquids which show either Newtonian or non-Newtonian flow behavior. ![]() It is the resistance which a fluid shows when being deformed. In this case, the oobleck’s viscosity or resistance to flow increases with applied stress. In scientific terms, viscosity is the measure of a fluid’s internal flow resistance. You can roll it into a solid ball in your hand, but if you stop moving it, it reverts to liquid and oozes out through your fingers. You can hit a bowlful with a hammer, and instead of splashing everywhere, the particles lock together. This liquid is a runny goo until you apply stress to it, and then it suddenly acts like a solid. Oobleck is a mixture of cornflour and water (similar to uncooked custard) named after a substance in a Dr Seuss book. In this case, the sauce’s viscosity decreases and it gets runnier with applied stress. This causes the tomato sauce to become more liquid and you can easily squirt some out. So what do you do? You shake or hit the bottle. You know there is some in there, but when you turn the bottle upside down, nothing comes out. Say you want to get some tomato sauce out of the bottle. Remove the stress (let them sit still or only move them slowly) and they will return to their earlier state. If you apply a force to such fluids (say you hit, shake or jump on them), the sudden application of stress can cause them to get thicker and act like a solid, or in some cases it results in the opposite behaviour and they may get runnier than they were before. Non-Newtonian fluids change their viscosity or flow behaviour under stress.
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