What are Newtonian fluid and non-Newtonian fluid?Īns: For an ideal fluid, the viscosity remains constant at constant temperature ie., It does not change under shear stress ( or pressure ) at constant temperatures, like water. What is the significance of dynamic viscosity?Īns: Dynamic viscosity signifies the property of a fluid to flow through a cross-section of a given area in a given time at constant temperature under an external force other than the gravitational force. What is the significance of kinematic viscosity?Īns: Kinematic viscosity signifies the property of a fluid to flow through a cross-section of a given area in a given time at constant temperature under gravitational force only. And thus change in viscosity of the given fluid. How does kinematic viscosity depend on temperature?Īns: Viscosity depends on temperature and a change in temperature changes the volume of fluid and so the density of the fluid. And it's also known as Absolute viscosity. FAQsĪns: The ratio of shear stress (force per unit area) over the velocity gradient is known as dynamic viscosity. And how these are related to densities and their application in different industries as well as in our daily life. In this tutorial, we learned that viscosity is of two types i.e. Dynamic Viscosity comes into play when we talk about the internal resistance in fluid among its neighbouring particles under an external force other than the gravitational force. Kinematic Viscosity comes into play when we talk about the overall flow of fluid under gravity only. Viscosity also finds applications in manufacturing printing ink. It is a characteristic when choosing the cooking oil, that directly affects our health. The coefficient of viscosity is also maintained in them so it can be easy to apply to the walls. Viscosity also plays an important role in the manufacturing of paints and varnishes. It also finds the applications in the pharmaceutical industry in the manufacturing of medicines like cough syrup. The coefficient of viscosity is used to calculate the molecular weight of organic liquids. The knowledge of viscosity helps us to understand which lubricant or oil is suitable for machines and engines. This means dynamic viscosity is also directly related to density. We observe that kinetic viscosity is inversely related to density which means if the density is increased the kinetic viscosity decreases and vice versa.įrom the above equation, we conclude that kinetic viscosity has a direct relation with dynamic viscosity and an inverse relation with density. Y is a shearing rate change Relation of Kinetic and Dynamic Viscosity with Density Mathematically, the viscosity is estimated by the given formula In liquids, generally, it increases with temperature and in gases, decreases with temperature. Viscosity differs with temperature for a given fluid. Viscosity is of two types kinematic viscosity and dynamic viscosity. A given temperature and pressure are characteristic of a given fluid. It arises due to the interactions between the entities of fluids. In fluids (liquid or gas), resistance (or friction) to flow is known as viscosity. Their units, representation, and the relationship between them. Now let's see what is viscosity in detail and what is the difference between kinematic viscosity and dynamic viscosity. In the first case, there is Kinematic Viscosity When only gravitational force is in action, and in the second case, when you apply an external force by squeezing, dynamic viscosity is in play. But viscosity in play is not the same in both cases. This is because ketchup is also very thick. And while pouring ketchup from the bottle, it takes more time to flow and needs an extra instantaneous force (by squeezing or squirting). If you have ever tried to take out honey by keeping the bottle upside down, it feels thick.
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