lab5.docx - DEPARTMENT OF MECHANICAL AND INDUSTRIAL ENGINEERING Drag Coefficient of Spheres A Lab Report submitted in partial fulfillment of the

# lab5.docx - DEPARTMENT OF MECHANICAL AND INDUSTRIAL...

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Drag Coefficient of Spheres A Lab Report submitted in partial fulfillment of the requirements of Mech 361: Fluids 2 Section XS Concordia University Course Instructor: Dr. Nabil Esmail Laboratory Instructor: Ali Reza Mehrabian D EPARTMENT OF M ECHANICAL AND INDUSTRIAL ENGINEERING
Abstract This laboratory report examines the results obtained from an experiment involving the study of drag coefficients of rigid spheres in various viscous fluids. The results are to compiled and compared against theoretical values as well as being used to calculate several qualities of flow around the spherical objects including buoyancy force, drag force and terminal velocities. I. Introduction Drag forces acting on a body can be reduced into two categories, pressure and friction. Depending on the geometry of the body one of the drag forces may be significantly lowered compared to the other. In the case of this laboratory report we are dealing with spheres thus the drag force due to pressure is extremely high compared to that of friction. An empirical formula is given by the lab manual; This laboratory explores the effects that gravity has on each sphere when the balls are dropped into the viscous fluids. A force that acts directly against the force of gravity is that of buoyancy which can be calculated using the following formulas; Similarly the drag force can be calculated using the following formula; All forces acting on the spheres can be balanced according to the following equation; We can also calculate a dimensionless variable known as the drag coefficient at steady state which can be calculated from the following equation; 1
II. Experimental Setup and Procedure Setup The setup for the experiment consisted of 3 Plexiglas tubes which contained water, Shell 10W and Shell Tellus oil respectively. The distance between the timed regions of the tubes was 2

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• Fall '15
• nabil esmail

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