REYNOLDS NUMBERS

REYNOLDS NUMBERS

See you again in this article that discusses REYNOLDS NUMBERS. Perhaps among us are still many who do not know what it Reynolds number, so on this occasion will discuss what it Reynolds numbers?  

REYNOLDS NUMBERS

REYNOLDS NUMBERS is the ratio of inertial forces (vs) to the viscous force (μ / L) that quantify the relationship between the two styles with a certain flow conditions. The Reynolds number can be used to identification different genres, such as the type of laminar and turbulent flow. Where the name is taken from the Osborne Reynolds (1842-1912) who proposed it in 1883.

Reynolds number is a dimensionless number that is very important in fluid mechanics and can be used as is the case with other dimensionless numbers. To provide criteria to determine the dynamic Similitude. If two similar flow patterns geometrically, possibly on different fluids and different flow rates, has a value of the relevant dimensionless numbers and both are called dynamic resemblance.
Formula Reynolds number is generally given as follows:
with:

• v - velocity of a fluid,
• L - characteristic length,
• μ - absolute viscosity of the fluid dynamic,
• ν - kinematic viscosity of the fluid: ν = μ / ρ,
• ρ - density (density) fluid.

For example, the flow in the pipe, the characteristic length is the diameter of the pipe, if the pipe cross-section round, or hydraulic diameter, for the cross-section is not round.
 

LAMINAR DEFINITIONS AND TURBELEN

1. Laminar flow
   Laminar flow is a flow of fluid that can move with the condition of the layers that make up the flow lines that do not intersect each other. It is shown by experiments Osborne Reynolds. At low flow rate laminar flow envisaged as long filaments flowing along the stream. This flow has a Reynolds number less than 2300  
2. Turbulent flow
   Turbulent flow is the flow of fluid particle moves randomly and unstable with fluctuating velocity interacting. As a result of the flow line between the fluid particles intersect. By Osborne Reynolds described as an unstable form that mixes in time so fast that further break down and become invisible. This turbulent flow has a number greater than 4000. The Reynolds number flow that has between 2300-4000 there was a mention as the flow in the transition state. Resulting in a change from laminar to the turbulent flow conditions.

That's it for discussion about REYNOLDS NUMBERS this time hopefully with this article we can know for sure what it Reynolds numbers and formulas. Thanks Hopefully Helpful.

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Ditulis oleh Iampsh pada tanggal Thursday, 18 December 2014