Question
Download Solution PDFReynold number is 1 to 2000 then drag coefficient:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Drag force is the resistance force caused by the motion of a body through a fluid, such as water or air. It acts opposite to the direction of motion. This is the relative velocity between the body and the fluid. It is given by:
\({\rm{F}} = \frac{1}{2}{{\rm{C}}_{\rm{d}}}{\rm{\rho A}}{{\rm{v}}^2}\)
Where,
Cd = Drag coefficient which depends on Reynolds Number, ρ = Density of medium/fluid, A = Projected area, and v is the velocity.
Cd values are:
\({{\rm{C}}_{\rm{d}}} = \frac{{24}}{{{{\rm{Re}}_{\rm{}}}}}\)
\({{\rm{C}}_{\rm{d}}} \propto \frac{{1}}{{{{\rm{Re}}_{\rm{}}}}}\)
So, as Reynold's number increases from 1 to 2000, the drag coefficient decreases.
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