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Ques.2: (a) What is the effect of temperature on the viscosity of liquid? The density of blood is 1.06 x 10 3 kg/m 3. (b) What is the corresponding flow rate? Take viscosity of blood to be 2.084 x 10 -3 Pa-s. Ques.1: What is the largest average velocity of blood flow in an artery of radius 2 x 10 3 m if the flow must remain laminar? The measurement of viscosity is very important for the manufacturing of a product.Units of viscosity are dynes sec cm -2 , N s m -2 or Pascal seconds (Ps).Viscosity is of two types- Kinetic Viscosity and Dynamic Viscosity.The formula to measure viscosity is η = 2ga 2( ρ)/9v.The measurement of the resistance offered by the fluid to deformation at a given is known as the viscosity of the fluid.Fluids with high viscosity are used to create glue/gum.
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Fluids with high viscosity are used to create medicines like syrups.Viscosity is determined even in food batters used to prepare dosa, idli, chapatis, etc.Blood circulation through arteries and veins depends upon the viscosity of fluids.For any painting purpose, fluids with high viscosity are used.The ink used in the pen is made of high viscosity fluid.The importance of viscosity can be understood from the given points: Below mentioned are some of the different fluids and their viscosities. Pascal seconds (Pa s) is used to measure Viscosity. To know the internal resistance of a fluid, dynamic viscosity is measured.Įvery fluid/liquid has a different viscosity level.The most popular instrument used to measure dynamic viscosity is Rotational Viscometers.An external force is applied to measure the resistance flow of the liquid.Stokes is the unit of Kinematic viscosity.Mostly Newtonian liquids use kinematic viscosity measurement.The most common method used to measure kinematic viscosity is using a capillary tube in which the fluid is allowed to flow through it and the time taken is measured.Under the weight of gravity, the resistive flow of a fluid is measured.There are two different ways to measure the viscosity of a fluid and they are: Viscosity is the measurement of the friction of the fluids. Moreover, the production and logistics processes are designed only when the viscosity of a material is precisely measured. Either it would be difficult to remove the paste from the tube or the whole paste will pump out in a single pressure. The measurement of viscosity is very important for the manufacturing of a product.įor Instance, if the viscosity of toothpaste is incorrect.
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So, to understand the nature of the given material, they gather all the material data, including its viscosity. It is very important for manufacturers to know about the properties of a material. So, the other units of Viscosity are N s m -2 or Pascal seconds (Ps) Need to measure Viscosity So, the unit of viscosity is dynes sec cm -2. The measurement of the resistance offered by the fluid to deformation at a given is known as the viscosity of the fluid.Įxample: The Viscosity in honey is higher than in water. This is the reason why fluids with excessive viscosity need greater pressure to move than the ones with low viscosity. Shearing happens while a fluid moves or is transferred, like pouring, spraying, spreading, blending, and so on. Greater is the friction, greater is the quantity of force required to move the layers this is known as shear. The internal forces or friction of fluid comes into play while one layer of fluid is subjected to move over every other layer. It’s a measurement of the inner forces of a fluid. Viscosity is the tendency of a fluid to resist any change in its form or movement. This difference is due to a fluid property called Viscosity.Īlso Read: Viscosity in Detail What is Viscosity?
Kinematic viscosity full#
But if you pour a glass full of Oil on your head, it would take more time to flow through the hair and reach your face. If you pour a glass full of water on your head, it will run through your hair and flow over your face quickly.