Introduction to Meter Constants and Reynolds Numbers

Abstract: The introduction information of instrument constant and Reynolds number is provided by excellent flowmeter and flowmeter manufacturers. When measuring the fluid flow in the pipe, it is often necessary to know its flow state, flow velocity distribution, etc. Reynolds number is an important parameter to characterize fluid flow characteristics. The ratio of the inertial force Fg to the viscous force (internal frictional force) Fm during fluid flow is called the Reynolds number. with symbols. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the introduction articles of meter constants and Reynolds numbers. When measuring the fluid flow in the pipe, it is often necessary to know its flow state, flow velocity distribution, etc. Reynolds number is an important parameter to characterize fluid flow characteristics. The ratio of the inertial force Fg to the viscous force (internal frictional force) Fm during fluid flow is called the Reynolds number. It is represented by the symbol Re. Re is a dimensionless quantity. A similarity criterion for characterizing the effect of viscosity in fluid mechanics. Named in honor of O. Reynolds, recorded as Re. Re=ρvL/μ,ρ,μare the fluid density and dynamic viscosity, and v and L are the characteristic velocity and characteristic length of the flow field. For the outflow problem, v and L generally take the velocity of the incoming flow in the far front and the main size of the object (such as the wingspan or the diameter of the sphere); for the internal flow problem, the average flow velocity in the channel and the channel diameter are taken. The Reynolds number expresses the ratio of the inertial force to the viscous force [1] acting on the fluid micelle. If the Reynolds numbers of the two geometrically similar flow fields are equal, the ratio of the inertial force to the viscous force of the corresponding micelles is equal. The smaller the Reynolds number, the more significant the influence of the viscous force, the larger the more significant the influence of the inertial force. Flows with very small Reynolds numbers, such as those in a lubricating film, have viscous effects that pervade the entire flow field. For a flow with a large Reynolds number (such as the general flow around an aircraft), the viscous effect is only significant in the boundary layer or wake near the object surface. In fluid mechanics experiments involving viscous effects, the Reynolds number is the main similarity metric. However, the Reynolds number of many model experiments is much smaller than the real Reynolds number. Therefore, it is an important subject to study the correction method and develop high Reynolds number experimental equipment. The small Reynolds number means that the viscous force between the particles is dominant when the fluid flows, and the particles of the fluid flow regularly parallel to the inner wall of the pipeline, in a state of laminar flow. A large Reynolds number means that the inertial force is dominant, and the fluid is in a state of turbulent flow. Generally, the Reynolds number Re of the pipeline is<2000 is the laminar flow state, Re>4000 is a turbulent state, and Re=2000-4000 is a transition state. In different flow states, the motion law of the fluid and the distribution of the flow velocity are different, so the average flow velocity of the fluid in the pipeline is different.υwith the maximum flow rateυThe ratio of max is also different. Therefore, the size of the Reynolds number determines the flow characteristics of viscous fluids. When the external conditions are geometrically similar (geometrically similar pipes, fluid flowing through geometrically similar objects, etc.), if their Reynolds numbers are equal, the fluid flow states are also geometrically similar (hydrodynamically similar). This similarity is the basis for the standardization of flow measurement throttling devices. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Introduction to Instrument Constants and Reynolds Numbers'

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