Renayald number and turbulent number explain

What is laminar flow and also difine tourbulnt flow and stream flow

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  • Reynolds number is used to check whether the flow is laminar or turbulent. It is denoted by Re. Reynolds Number = inertial force/viscous force
    Re = ρ V L / μ
    ρ = density (kg/m3,)
    V = velocity based on the actual cross section area of the duct or pipe (m/s)
    μ = dynamic viscosity (Ns/m2)
    L = characteristic length (m)
    Laminar Flow - when Re < 2300
    Turbulent Flow- when Re > 4000
     
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  • Reynolds Number is a unitless quantity which helps us to determine whether the fluid flow is laminar or turbulent .
    Laminar flow generally occurs at low Reynold numbers such as less than 2300 . It is that type of flow in which particle flow in parallel layer .
    Turbulent flow generally occurs at high Reynold number such as above 4000 . In this type of flow article flow in tiny whirlpool region in zig zag way .
    Streamflow also known as channel flow is the flow of water in streams , rivers and other channels and it is also a major element of the water cycle .
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  • The Reynolds number is the ratio of a fluid's inertial force to its viscous force. Inertial force involves force due to the momentum of the mass of flowing fluid. Think of it as a measure of how difficult it would be to change the velocity of a flowing fluid. Viscous forces deal with the friction of a flowing fluid. Think of pouring a cup of tea versus pouring cooking oil. The cooking oil has a higher viscosity because it's more resistant to flow.
    If you are thinking inertial force and viscous force are very similar, you are correct. In fact, they are so similar that they have the same units! This means the Reynolds number is unitless. We can determine whether fluid flow is laminar or turbulent based on the Reynolds number.
    If the Reynolds number is less than 2300, the flow is laminar. Any Reynolds number over 4000 indicates turbulent flow. In between these values indicates transient flow, which means the fluid flow is transitioning between laminar and turbulent flow. This usually happens only for a short period of time at the beginning or end of fluid flow when a valve or faucet is turned on or off. 
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  • Renayald no is term that defined direction of flow of fluid re no. For turbulnt greater than 4000 for laminar flow re no. Less than 2300
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  • Reynolds number is a dimensions less value which is applied in fluid mechanics to represent whether the fluid flow in a duct or part a body is streamline or turbulent it is between 40 and 1000. Tarbulent number (Prt) is a non dimentional term it is ratio of momentum Eddy diffusivity and heat transfer Eddy diffusion
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  • Flow is said to be laminar if Reynolds no.is less than 2000, for turbulent flow Reynolds no.is greater than 4000 and in between 2000-4000 initially streamline flow takes place later flow becomes turbulent as the velocity of particles in fluid will increase
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  • For laminar flow Reynold's no <2000

    For torbulant flow Reynold's no>4000

     
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  • Flow having Reynolds's no >4000 then it is turbulent and if less than 2000 then it is laminar..
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