Ethylene - Dynamic and Kinematic Viscosity vs.Head Loss Calculate pressure loss - or head loss - in ducts, pipes or tubes. Dimensionless Numbers Physical and chemical dimensionless quantities - Reynolds number, Euler, Nusselt, and Prandtl number - and many more.Darcy-Weisbach Equation - Major Pressure and Head Loss due to Friction The Darcy-Weisbach equation can be used to calculate the major pressure and head loss due to friction in ducts, pipes or tubes.Colebrook Equation Friction loss coefficients in pipes, tubes and ducts.Temperature and Pressure Online calculators, figures and tables with dynamic and kinematic viscosity of liquid and gaseous butane, C 4H 10, at varying temperarure and pressure, SI and Imperial units. Butane - Dynamic and Kinematic Viscosity vs.Water Systems Hot and cold water service systems - design properties, capacities, sizing and more.Piping Systems Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams.Involving velocity, pressure, density and temperature as functions of space and time. Fluid Mechanics The study of fluids - liquids and gases.Fluid Flow and Pressure Loss Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more. Hydraulic diameter - d h - (or c haracteristic length - L) (m, ft)Ībsolute (dynamic) viscosity - μ - (Ns/m 2, lb m /s ft) The calculator is generic and can be used for metric and imperial units as long as the use of units are consistent. The calculator is valid for incompressible flow - flow with fluids or gases without compression - as typical for air flows in HVAC systems or similar. This calculator can be used if density and absolute (dynamic) viscosity of the fluid is known. Online Reynolds Calculator Density and absolute (dynamic) viscosity is Known free apps for offline use on mobile devices. Reynolds Number can then be calculated using equation (1) like ĭensity can be calculated from the specific gravity of the fluid and the density of the specific gravity reference water 1000 kg/m 3 - as Example - Calculate Reynolds NumberĪ Newtonian fluid with a dynamic or absolute viscosity of 0.38 Ns/m 2 and a specific gravity of 0.91 flows through a 25 mm diameter pipe with a velocity of 2.6 m/s. In practice laminar flow is only actual for viscous fluids - like crude oil, fuel oil and other oils. The Reynolds Number can be used to determine if flow is laminar, transient or turbulent. Ν = kinematic viscosity (cSt) (1 cSt = 10 -6 m 2 /s ) The Reynolds number for a pipe or duct expressed in Imperial units The Reynolds Number for the flow in a duct or pipe can with the hydraulic diameter be expressed asĭ h = hydraulic diameter (m, ft) Reynolds Number for a Pipe or Duct in Imperial Units Ν = μ / ρ = kinematic viscosity (m 2 /s, ft 2 /s) Reynolds Number for Flow in Pipe or Ductįor a pipe or duct the characteristic length is the hydraulic diameter. Μ = dynamic viscosity (Ns/m 2, lb m /s ft) U = velocity based on the actual cross section area of the duct or pipe (m/s, ft/s) Reynolds Number can therefore be expressed as dynamic pressure (ρ u 2 ) to shearing stress (μ u / L).inertia force (ρ u L) to viscous or friction force (μ).Reynolds Number - the non-dimensional velocity - can be defined as the ratio
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