Reynolds number explained.

Welcome to another lesson in the "Introduction to Aerodynamics" series!
In this video I explain the concept and the formula of the Reynolds number, one of the most important parameters in aerodynamics.

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[FranzBond]

Thank you for taking the time to do the explanation.
Re<2100=laminar and Re>4200=turbulent ONLY applies in closed channels such as pipes, not for external flow such as airfoils.

[LeoHL]

The tranistion point is incorrect in this video for a wing, 2100 to 4000 is for flow in a pipe

For a wing, without inducing it by changing the AoA, it is about 500, 000, eg the variable is velocity only.

To induce it by stalling the wing the transition point is about 50, 000.

Using the transition value for a pipe and applying it to a wing is common mistake people make when dealing with Reynolds numbers.

[claramelb]

Thank you! I finally understood the Reynolds number :)

[balajilakshminarayan]

Very well explained. I am from electrical background and still able to understand every bit of this video. Thanks!!!

[mohamadfahrulradzi]

help me a lot to solve my Fluid Mechanic project, Thanks so much. Love from Malaysia

[charchitgaur]

Excellent Aliya mam I understood it's👍

[vibinhigh_]

Thank you for video. Love from pakistan. Finally understand renold number

[TheMrMEEEEE]

You're awesome. Thanks for the clear and concise content.

[reeceengineering]

Good job. If you could make a video explaining how to scale airfoils up and down to maintain RE, that would be good. Theres a burst of RC Airplanes being designed right now and we are all wanting to properly access existing airfoils, which will involve scaling them down.

[LindoMtsweni]

Did you say the Reynolds numbers will be same for the wind tunnel testing and the real size plan ??

[Sondus-yuhl]

hey, Aliya I have a question, please. if a steel pipe with a diameter 0.02 m is used to deliver jet fuel from the tank to the engine of an aircraft. The jet fuel has a density of 900 kg/m3 and kinematic
viscosity 5×10-6 m2/s. If the engine burns 1000 kg of jet fuel per hour.
what would be the Reynolds number of the flow?

[fernandofreitasalvesdelima]

Thank you for teaching Me this Reynolds number!!!

[백승원-ez]

thank you for your wonderful lecture and appearance

[andrecarvalho]

Airflow that is attached to a wing can be laminar or turbulent.

[R_Alexander]

Hi

I'm a bit confused, I understand that the effect of low Reynolds number on an airfoil is increased drag and decreased lift. Which is more desirable, a high or a low Reynolds number for a wing airfoil?

[manjpoooegx]

Basically your English is very easy to understand from India
Your English is better and so good

[Fiendnat]

im doing a wind tunnel report for airfoil 0012
to find reynolds number, i have to use the chord length?

[marccretten]

Question...maybe its a dumb one but here goes...If Laminar flow is Re<2100 and Turbulent is Re>4000, what happened between 2100 and 4000?

[heydonray]

VSE (Vid Scoring Equation): ECF (Eye Candy Factor) * EV (Educational Value) = VSE, and in this example 10*10 = perfect score of 100

[mazharameerpg]

Reynolds number is fluid so we will define it for gases because we some time deal with gases so how will elect it flow type
?