1.3.3. Classification Based on Reynolds Number

Try these first

1. 1.

   What is the formula for Reynolds number?

   Hint

   It includes density, velocity, hydraulic radius, and viscosity.

2. 2.

   What flow regime occurs when Reynolds number is less than 500?

   Hint

   It's the first regime in classification.

3. 3.

   What is the flow regime if the Reynolds number is 400?

   • Laminar
   • Transitional
   • Turbulent

   Hint

   Check the classification boundaries.

4. 4.

   True or False: Turbulent flow can only occur when the Reynolds number is greater than 12,500.

   • True
   • False

   Hint

   Refer back to the Reynolds number classifications.

5. 5.

   A channel with dense fluid flows at 1.5 m/s, with hydraulic radius of 0.2m, and viscosity 0.0007 Pa·s. What’s the flow regime?

   Hint

   Remember to use the Reynolds number formula based on provided parameters.

6. 6.

   In a lab, water has a low viscosity and flows slowly through a pipe. If the velocity is 0.03 m/s, what can you conclude about the Reynolds number?

   Hint

   Use the small flow conditions to evaluate likely flow characteristics.