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The Coefficient of Drag given Reynold Number is a dimensionless quantity that is used to quantify the drag or resistance of an object, considering Reynold number. It represents the relationship between inertial forces and viscous forces within a fluid.
The calculator uses the formula:
Where:
Explanation: This formula calculates the drag coefficient based on the Reynolds number, which describes the flow regime around an object.
Details: Accurate drag coefficient calculation is crucial for predicting fluid resistance on objects, designing aerodynamic structures, and optimizing fluid flow systems in various engineering applications.
Tips: Enter the Reynolds number (must be greater than 0). The calculator will compute the corresponding drag coefficient.
Q1: What is the Reynolds Number?
A: The Reynolds Number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.
Q2: When is this formula applicable?
A: This formula is typically used for spherical objects in laminar flow conditions at low Reynolds numbers.
Q3: What are typical Reynolds number ranges?
A: Reynolds numbers can range from less than 1 (creeping flow) to over 1,000,000 (turbulent flow), with different drag coefficient relationships applying to different ranges.
Q4: Are there limitations to this equation?
A: This specific formula (Cdr = 24/Re) is primarily valid for Stokes flow conditions (very low Reynolds numbers, typically Re < 1).
Q5: How does drag coefficient change with Reynolds number?
A: The drag coefficient generally decreases with increasing Reynolds number, though the relationship becomes more complex at higher Reynolds numbers where turbulence develops.