Table of Contents
How was the Reynolds number discovered?
In 1883 Osborne Reynolds, a British engineer and physicist, demonstrated that the transition from laminar to turbulent flow in a pipe depends upon the value of a mathematical quantity equal to the average velocity of flow times the diameter of the tube times the mass density of the fluid divided by its absolute …
Who invented the Reynolds number?
scientist Osborne Reynolds
In 1883, Irish scientist Osborne Reynolds discovered the dimensionless number that predicts fluid flow based on static and dynamic properties such as velocity, density, dynamic viscosity and characteristics of the fluid^2.
How did Osborne Reynolds discover fluid dynamics?
In early 1883, Reynolds performed his classic experiment on fluid flow, investigating different flow rates of water by squirting a jet of dyed water into water flowing through a large glass pipe. There was a control valve at one end of the pipe to allow him to control the velocity.
Who invented Reynolds apparatus?
Professor Osborne Reynolds
Osborne Reynolds
Professor Osborne Reynolds FRS | |
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Known for | Fluid dynamics, Reynolds number |
Awards | Royal Medal (1888) Dalton Medal (1903) |
Scientific career | |
Fields | Physics, Mechanical Engineering |
Who invented laminar and turbulent flow?
History. The distinction between laminar and turbulent regimes was first studied and theorized by Osborne Reynolds in the second half of the 19th century.
What does the Reynolds number represent?
The Reynolds number is the ratio of inertial forces to viscous forces. The Reynolds number is a dimensionless number used to categorize the fluids systems in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.
Who discovered turbulence?
Enlarge / One of the first to visualize these flows was scientist, artist, and engineer Leonardo da Vinci, who combined keen observational skills with unparalleled artistic talent to catalog turbulent flow phenomena. Back in 1509, Leonardo was not merely drawing pictures.
What does Reynold number represent?
What is Reynolds number what is its importance?
The Reynolds number (Re) helps predict flow patterns in different fluid flow situations. At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers flows tend to be turbulent.
What does the Reynolds number tell you?
The Reynolds number is a dimensionless number. High values of the parameter (on the order of 10 million) indicate that viscous forces are small and the flow is essentially inviscid. The Euler equations can then be used to model the flow.
What is the critical Reynolds number for fully developed flow?
For flow in a pipe of diameter D, experimental observations show that for “fully developed” flow, the critical Reynolds number is about Red,crit = 2300. For flow over a flat plate, transition from laminar to turbulent boundary layer occurs when Reynolds number at x exceeds Rex,crit ~ 500,000.
What is the Reynolds number for a pipe or duct?
The Reynolds number for a pipe or duct expressed in Imperial units. Re = 7745.8 u dh / ν (2a) where. Re = Reynolds Number (non dimensional) u = velocity (ft/s) dh = hydraulic diameter (in) ν = kinematic viscosity (cSt) (1 cSt = 10-6 m2/s ) The Reynolds Number can be used to determine if flow is laminar, transient or turbulent. The flow is.
What is the formula for rereynolds number?
Reynolds Number can therefore be expressed as Re = ρ u L / μ = ρ u2 / (μ u / L) = u L / ν (1)