Newton’s Law of viscosity Viscosity is the property of a fluid which offers resistance due to the movement of one layer of fluid over another adjacent layer of fluid. The top layer causes a shear stress on the adjacent lower layer while the lower layer causes a shear stress on the adjacent top layer. So the viscosity is a measure of the internal fluid friction which causes resistance to flow. It is primarily due to cohesion and molecular momentum exchange between fluid layers and as flow occurs, these effects appear shearing stresses between the moving layers of fluid. An ideal fluid has no viscosity. There is no fluid which can be classified as a perfectly ideal fluid. However, the fluids with little viscosity are sometimes considered as ideal fluids. …show more content…
Types of Fluids
(i) ideal Fluid A fluid which is incompressible and is having no viscosity is known as ideal fluid. Ideal fluid is only an imaginary fluid as all the fluids, which exist, have some viscosity.
(ii) Newtonian Fluids The fluids which obey the Newton’s law of viscosity i.e. a linear relationship between the stress tensor and rate of strain tensor(τ=μ du/dy ), are called Newtonian fluids. These fluids are represented by a straight line on a graph between the components of shearing stress and rate of strain. The slope of line is represented by material constant μ i.e. coefficient of viscosity. In general this constant is a function of material properties like temperature and density. For such fluids, μ does not change with rate of deformation.
(iii) Non- Newtonian Fluids The fluids which do not obey the Newton’s law of viscosity i.e. fluids which do not follow the linear relationship between shear stress and rate of deformation are termed as Non-Newtonian fluids.
Examples: oil, rubber, plastic, ink, honey, blood
In an arterial system, the input impedance of the vessel varies with changes in the vessel’s size and properties. For compliant arteries, whic...
Any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids.
is the tongue so large? Why is it so scratchy on the sides? Is that a
The thermometer, containers, and iron ball were secured of any possible contaminants. The stopwatch was calibrated and checked to be correctly measuring the time in seconds and milliseconds, by comparison with other stopwatches. The thermometer was checked to be accurately measuring the temperature of lukewarm water, and was al...
Rigid body motion does not change the length of a vector joining the pair of points inside the body and has no concern with the strain analysis. When external forces are applied on an elastic body, the body undergoes deformation. Due to the elasticity of the body, there comes into play a force which resists the deformation. This force is called stress force. Clearly, the deformation of the body is accompanied by the stress force. In other words, stress and strain occur together in inelastic body. There are two types of elastic deformation: (i) Dilatation and (ii) Shear strain set up in the body in such a way that there is a change only in volume but no change in shape, is called dilatation. In the shear deformation, there is a change in the shape of the body without a change in its volume. Dilatations are further categorized into two kinds: compression, in which volume is reduced; and rarefaction, in which the volume is
The equipment they are using was not originally designed for the lower viscosity of Greasex.
The Results obtained from the experiment proved the original theory at the start of the experiment. The results table clearly shows pigment levels increasing with the rinsing temperature increments.
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Evaporation is part of our everyday lives. After washing the dishes, after taking a shower, and many more signs of evaporation in our everyday lives, but does every type of liquid evaporate at the same rate? Sometimes liquids may be sitting in one dry place and its molecules might turn into gas molecules, that is the process of evaporation. When energy in certain molecules reaches a specific level, those molecules have a phase change. Evaporation occurs when molecules escape from their liquid and form into vapor. If there was a puddle of water outside, and it was a windy day, the air from the wind can cause an increased rate of evaporation. When a molecule
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Surface Tension: The contractive tendency of a liquid that allows it to resist an external force. This is measured in Newton.
Heat energy is transferred through three ways- conduction, convection and radiation. All three are able to transfer heat from one place to another based off of different principles however, are all three are connected by the physics of heat. Let’s start with heat- what exactly is heat? We can understand heat by knowing that “heat is a thermal energy that flows from the warmer areas to the cooler areas, and the thermal energy is the total of all kinetic energies within a given system.” (Soffar, 2015) Now, we can explore the means to which heat is transferred and how each of them occurs. Heat is transferred through conduction at the molecular level and in simple terms, the transfers occurs through physical contact. In conduction, “the substance
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The science of fluid mechanics is neither new nor biblical; however, most of the progress in this field was made in the 20th century. Therefore it is appropriate to open this text with a brief history of the discipline, with only a very few names mentioned.