Reinhold, 1984 York:Van W. Churchill and M. Bernstein. 12 H. Schliching Boundary

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Reinhold, 1984 York:Van W. Churchill and M. Bernstein. 12 H. Schliching Boundary La New York: McGraw-Hill. 19 Heinen for Forced Conv A S. W. Ch Cvlinder in Cross F, Journal of Heot 13. M. Van Dyke. An Albham of runsfer 99. pp. 300-30, 1977. and H.Brenner. Low Rgynolds Numbe The Parabolic Pess, 1982 14. J. Vogel. Life in Moving Fl uppel ae with Special Applications to Particulate15. F. M. White. Fluid Mechoni Willard Grand Press, 1994, MA: Kluwer Academic Publishers, 2003. raw-Hall,2010 PROBLEMS ft while png Lift, and Drag Coefficients 15-7C Name some applica Consider laminar flow over a flat plate. How does desired ixcal friction coefficient change with position? s deter- 15-8C What is drag? What Define the frontal area of a body subjected to exter ty to minimine i? os When is it appropriate to use the frontal area in drag 15.9C What is lift Wha tribute to the lit? IIC Define the planform area of a body subjected to 15-10C During fow over aurmal flow. When is it appropriate to use the planform areathe upstream velacity, and t Explain how you would dete e mini 14C Explain when an external flow is two-dimensional, arca would you use in the al 15-12C What is the differ e drag and lift calculations? ent and tree-dimensional, and axisymmetric. What type of flow is 15-11C What is terminal he flow of air over a car? an, the 15-5C What is the difference between the upstream veloc- and pressure drag? Which y and the free-stream velocity? For what types of flow are slender bodies sach as airfioi tese two velocities equal to each other? 15-13C What is the offect ults in IS-6C What is the difference between streamlined and tion drag coefficient in la bodies? Is a tennis ball a streamlined or bluff body? 15-14C What is the efles in a drag and (b) pressure drag body necessanily decrease 15-15C What is flow entis designated by a "C" are concept questions, and sre encouraged to answer them all. Problems des am of airfoilroblems gnated the effect of how separation sh units, and the SI users can ignore them. conare comprehensive in nature and are 15-16C What is drafting ficient of the drafted body? s with the to be solved with an appropriate ended

Explanation / Answer

Planform area is area of body when looked from the sideways, it is used to calculate the lift on the body.

For example:

If we are looking for planform area of an aeroplane wing then it will look like of trapezoid shape so

Planform area of the wing will be equal to area of that trapezoid

Or = 1/2 * (sum of two sides) * height

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