Homework Statement:
Estimate what the Reynolds number is of the fluid flowing around the table
Relevant Equations:
Reynolds number
I have to estimate the Reynolds number of the fluid flowing around a blade but I only have one detail: the length of the blade is 0.66m.
I have no idea how to do it and I gotta submit the assignment in a week, I am desperate for help here.

It says estimate. Have you seen the blades turning?

Chestermiller
Mentor
It might help if you started out by providing for us some indication of your understanding of the definition of the Reynolds number.

It says estimate. Have you seen the blades turning?

I haven't. That is all the information I got which I find strange

It might help if you started out by providing for us some indication of your understanding of the definition of the Reynolds number.
The Reynolds numbers is a parameter that helps obtain a flow pattern estimation in various fluid flow situations
The Reynolds number is mathematically defined as:

where:
• is the fluid density (kg/m3)
• is the flow velocity
• is a linear dimension
• is dynamic viscosity (Pa.s)
• v is kinematic viscosity (m2/s)

Chestermiller
Mentor
The Reynolds numbers is a parameter that helps obtain a flow pattern estimation in various fluid flow situations
The Reynolds number is mathematically defined as:
View attachment 274953
where:
• is the fluid density (kg/m3)
• is the flow velocity
• is a linear dimension
• is dynamic viscosity (Pa.s)
• v is kinematic viscosity (m2/s)
Good. I assume you are dealing with air at approximately room temperature conditions. So you know the density and viscosity, right? You also have a characteristic length. Ok so far?

Good. I assume you are dealing with air at approximately room temperature conditions. So you know the density and viscosity, right? You also have a characteristic length. Ok so far?

The wind turbine is supposed to be an offshore wind turbine so I am guessing the density of the air= 1,225 kg/m^3 and viscosity of air= 1,789x10^-5 (this is only what I am guessing though, doesn't mean it is right. The only known detail I know as it is visible on the imagen I posted on my post is the wind turbine geometric but I also believe that 660,60mm is too little measurement for a wind turbine blade.

Good. I assume you are dealing with air at approximately room temperature conditions. So you know the density and viscosity, right? You also have a characteristic length. Ok so far?
I also got the Area of the blade if it helps.

Chestermiller
Mentor
The wind turbine is supposed to be an offshore wind turbine so I am guessing the density of the air= 1,225 kg/m^3 and viscosity of air= 1,789x10^-5 (this is only what I am guessing though, doesn't mean it is right. The only known detail I know as it is visible on the imagen I posted on my post is the wind turbine geometric but I also believe that 660,60mm is too little measurement for a wind turbine blade.
I’m not so sure that 0.66 m is short for a turbine blade. Why don’t you make a graph of Re vs velocity?

I’m not so sure that 0.66 m is short for a turbine blade. Why don’t you make a graph of Re vs velocity?
I don't understand you. When it says "Estimate what the Reynolds number is of the fluid flowing around the blade" I am guessing I have to calculate it using a formula.

Chestermiller
Mentor
I don't understand you. When it says "Estimate what the Reynolds number is of the fluid flowing around the blade" I am guessing I have to calculate it using a formula.
You have the formula. Just substitute a selection of values for the velocity and plot a graph.

You have the formula. Just substitute a selection of values for the velocity and plot a graph.
Apparently, my teacher has just told me I have to use the typical fluid velocity, that I have no idea what it is

Chestermiller
Mentor
Apparently, my teacher has just told me I have to use the typical fluid velocity, that I have no idea what it is
What does your gut tell you about the probable range of velocity values?

What does your gut tell you about the probable range of velocity values?
My gut? I don't understand the problem and neither I understand what my teacher has said, so I don't think my gut is able to tell me anything.

berkeman
Mentor
The wind turbine is supposed to be an offshore wind turbine
Apparently, my teacher has just told me I have to use the typical fluid velocity, that I have no idea what it is
I don't understand the problem and neither I understand what my teacher has said, so I don't think my gut is able to tell me anything.
What are typical wind speeds for offshore wind installations (Google should be able to find it)? What would a typical speed be for a wind turbine of this size in those wind conditions? Google should be able to help you find ballpark numbers for that as well...

Chestermiller
Mentor
What is the speed of typical winds on a moderately windy day? What about in a moderate tropical storm?

Chestermiller
Mentor
I'm thinking wind speeds of 3-30 m/s, with a typical moderate value being on the order of 10 m/s. Anyway, that's my gut feeling.