![]() The effect of viscosity is important in a variety of disciplines, for example, in the study of fluids and gasses, as it governs their behavior.ĭo you know what will happen if you pour 1000 ml of water on a person's head? The water flows through the person's hair and then over the face. If the flow is a stream of uniform velocity, there is zero viscosity if, on the other hand, the velocity is turbulent and chaotic, there will be some viscosity. If the fluid is caused to flow smoothly and regularly, there will be no viscosity. ![]() More simply, it is the resistance to a simple flow. In physics, Viscosity is defined as the measure of the resistance of a fluid to flow. Hence, the water flow is turbulent.The measure of a fluid's resistance to flow is known as viscosity. In our Reynolds number calculator, you can choose (as a substance) water at 10 ° C \rm 10\ ☌ 10 ☌, and you obtain the Reynolds number R e = 32483 \rm Re = 32 483 Re = 32483. The velocity of tap water is about u = 1.7 m / s u = 1.7\ \rm m/s u = 1.7 m/s. Other shapes usually have a defined equivalent diameter.įor example, let's calculate the Reynolds number for the water flow in an L = 2.5 c m L = 2.5\ \rm cm L = 2.5 cm diameter pipe. For A flow in a pipe, we can use either its internal radius or diameter.For An aircraft, we can use either the length and width of aerofoils and.A sphere, we can use either its radius or diameter.Characteristic linear dimension L L L (or characteristic length) in the above formulas is a matter of convention. In this calculator, you can choose a particular substance from some examples we have prepared or enter your own fluid parameters. ν \nu ν – Kinematic viscosity of a fluid ( ν = μ / ρ \nu = \mu / \rho ν = μ / ρ).μ \mu μ – Dynamic viscosity of a fluid and.L L L – Characteristic linear dimension.u u u – Velocity of fluid (with respect to the object).Although the Reynolds number can be defined in several different ways, it remains a non-dimensional factor. If you want to learn more about fluid viscosity, you should check out Stokes' law calculator, where you can find, among others, viscosity definition. The Reynolds number definition generally includes the velocity of a fluid, the characteristic length (or characteristic dimension), and the properties of the fluid, such as density and viscosity. On the other hand, viscous forces counteract this effect and progressively inhibit turbulence. On one hand, inertial forces generate fluid friction which is a factor in developing turbulent flow. The Reynolds number is the ratio of inertial forces to viscous forces exerted on a fluid that is in relative motion to a surface. For example, if you want to compare a small-scale model (e.g., a model of an airplane) with a real situation, you should keep the Reynolds number the same. Reynolds number is one of the characteristic numbers used in fluid dynamics to describe a character of the flow. They can be very useful in analyzing fluid motion. Using this calculator, you will also find some examples of calculations that can be done with the Reynolds number formula.Īre you interested in fluid mechanics? You should also check our buoyancy calculator or Bernoulli equation calculator. Read on to find out what are the laminar flow and turbulent flow Reynolds numbers. In the following text, we have provided the Reynolds number equation, units discussion, and a comparison of laminar and turbulent flows. It can describe liquid flow in a pipe, flow around airfoils, or an object moving in a fluid. The Reynolds number has broad applications in real life. Keep reading if you want to find the answers to these questions: This factor measures the ratio of inertial forces to viscous forces occurring during the fluid movement. With our Reynolds number calculator, you can quickly compute the Reynolds number that helps predict whether the flow of a liquid will be laminar or turbulent.
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