Drag on a Cylinder

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Drag on a cylinder
ENME432L section 0101 Date of the Experiment: Feb. 21, 2012
Date submitted: Feb. 28, 2012
Instructor: Anilchandra Attaluri
Prepared by:
Ku Choe: ________ Dwight Hofstetter: _________
Aasam Tasaddaq: ________Kody Snow: ________
Benjamin DiDonato: _______
Lab report checklist: x Have you included the raw (handwritten) data sheet? x Have you included your pre-lab report which has been signed by your TA or instructor? x Have you typed the measured data and include them into your report? x Have you included enough data so that the instructor can calculate the final results himself? x Have you included detailed methods so that your younger brother or sister can understand what you did? x Have you
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Before using the machine, dimensions must be taken of the cylinder, dimensions of the inlet and outlet, the distance from the cradle to the pivot point, the distance from the weight balancing collar to the pivot point, and the distance from the cylinder to the pivot point. Prior to engaging the machine’s fan, the apparatus must be balanced. Referring to Figure 1, move the weight balancing collar to balance the moments. At this time the mass of the weight added to the cradle and the drag force is zero. Once the apparatus is balanced, measure the distance from the weight balancing collar to the pivot point. The fan can now be turned on. Balance the apparatus now by adding weight to the cradle to counter balance the now existent drag force. Record the added weight. The drag force can be found by Equation 2 which is derived from Equation 1.
FD = mwg(lcrad/lc) (2) FD is the drag force mw is the mass of the weight added to the cradle g is the acceleration due to gravity lcrad is the distance from the cradle to the pivot point lc is the distance from the cylinder to the pivot point Drag Coefficient, which is used to quantify the drag or resistance of an object in a fluid environment, can be calculated using Equation 3. CD=2FDρV∞2Ap (3) CD is the drag coefficient V∞ is
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