When a fluid is in motion, it experiences a resistance called shear resistance due to the inter-molecular friction between the layers of the fluid. In fluid dependent systems, viscosity influences the fluid behavior and fluid motion. Reynolds Number and the Viscosity of a Fluid Note that is the density of the fluid, is the velocity of the fluid, l is the characteristic length or hydraulic diameter of the fluid flow, is the dynamic or absolute viscosity of the fluid, and v is the kinematic viscosity of the fluid. Mathematically, the Reynolds number can be given by the following equation: It reveals the effect of fluid viscosity in controlling the flow pattern or velocity of the fluid. It can also be interpreted as the ratio of dynamic pressure to shearing stress. Reynolds number is the ratio of inertial forces to viscous forces, and this number categorizes fluid systems. Reynolds numbers with a value of less than 2300 indicate a laminar flow of the fluid. As the Reynolds number increases above 4000, the fluid flow becomes turbulent. When the Reynolds number is between 23, the fluid flow is transitional. Fluid can be gas or liquid, and the value of the Reynolds number determines whether the flow is laminar or turbulent. Generally, the Reynolds number is a dimensionless measurement that describes the degree of laminar or turbulent fluid flow. In this article, we will explore the relationship between the Reynolds number and the kinematic viscosity. Reynolds number is dependent on several fluid properties such as density, velocity, and viscosity, and this number shares an inversely proportional relationship with the kinematic and dynamic viscosity. The range of Reynolds numbers indicate the degree of laminar or turbulent flow. To identify the flow type, engineers depend on a dimensionless quantity called the Reynolds number. With these simulations, a clear understanding of the flow regime as well as its paths and velocities can be obtained. The flow behavior of such systems can be analyzed using computational fluid dynamics (CFD) simulations. In systems influenced by fluid flow, it is important to analyze the fluid dynamics in order to quantify their effect. The range of Reynolds numbers indicate the degree of laminar or turbulent flow Reynolds number is a dimensionless measurement that describes the degree of laminar or turbulent fluid flow.įluid viscosity can be measured as absolute or dynamic viscosity and kinematic viscosity.Īs the kinematic viscosity increases, the Reynolds number decreases and vice versa.
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