2.3. Drag Force Calculation

Try these first

1. 1.

   What is the formula for calculating Reynolds number?

   Hint

   Remember: It includes density, velocity, characteristic length, and viscosity.

2. 2.

   Define drag force in the context of fluid mechanics.

   Hint

   Think about forces that oppose motion.

3. 3.

   Which formula is used to calculate Reynolds Number?

   • Re = ρUd/μ
   • Re = ρU/μd
   • Re = μU/ρd

   Hint

   It refers to the ratio of inertial to viscous forces.

4. 4.

   True or False: The drag force increases with increasing boundary layer thickness.

   • True
   • False

   Hint

   Consider the relationship between boundary layer and drag.

5. 5.

   A ship with a length of 50 m has a velocity of 2.5 m/s in seawater. Calculate the Reynolds number and determine if the flow is laminar or turbulent.

   Hint

   Consider the average density and dynamic viscosity of seawater in your calculations.

6. 6.

   Develop the complete drag force equation for a flat plate in this scenario using the turbulent flow condition with given pressure gradients.

   Hint

   Recall integration techniques involving shear stress and dimensional analysis.