How Does the Magnus Force Produced for Different Angular Velocity 3Vary Across Different Values of Surface Roughness Such as Foil, Plastic, Paper, Cloth, and Felt Applied on a Rotating Cylinder?
Journal Title: International Journal of Physics and Research (IJPR) - Year 2017, Vol 7, Issue 5
Abstract
When a rotating cylinder was placed inside the uniform flow stream of any fluid, it created a force on the cylinder, called the Magnus force, perpendicular to the flow of the fluid. This force is directly related to the surface roughness of the material of the cylinder and the angular velocity of the cylinder’s rotation. In this research paper, I investigated this relation between the Magnus force produced, for different angular velocities and how it varies across the different values of the surface roughness applied to the cylinder To carry out an experiment, the cylinder was attached to a motor and fixed in such a way that, the cylinder rotated horizontally, and then this setup was stuck with a mass balance. The surface roughness of the cylinder were varied, by wrapping surfaces with different coefficient of static friction onto the cylinder, and the angular velocity was varied by varying the voltage across the motor. Using a hair-dryer, fixed at a constant distance away from the spinning cylinder, a uniform flow stream was provided. This resulted in a Magnus force that acted in the upward direction on the cylinder, which was calculated by measuring the change in mass of the setup, that was stuck to the mass balance. The angular velocity and the Magnus force had a linear relationship. This was due to the fact that, a higher value of angular velocity causes a bigger vortex, which results in a thicker boundary layer around the cylinder. This results in a stronger Magnus force. The force was directly proportional to the root of the coefficient of static friction of the material. Since, higher values result in stronger friction forces between the surface of the cylinder and the air particles, increasing the width of the boundary layer.
Authors and Affiliations
Devansh Rathi, Deepak Kumar Choudhary
Keywords
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