Question

Find the Cdrag (Cd) of a rectangular plate which is 100 mm wide and 4 mm deep

Answer 1

For a thin Rectangular Plate (C from Blevins, 2003) the drag is given by ,

the data below is for the flow vlocity of 25kmph and the fluid is the air

C=1.05 if L/D=1.0
C=1.10 if L/D=2.0
C=1.12 if L/D=4.0
C=1.20 if L/D=8.0
C=1.22 if L/D=10.0
C=1.22 if L/D=12.0
C=1.33 if L/D=17.8
C=1.90 if L/D=infinity

here, L = 100 , D = 4

L/D = 100/4 = 25

Since L/D ratio lies between 17.8 to infinity for which Cd lies between 1.33 to 1.90

Hence from interpolation Cd will be around 1.4-1.5

answered by: anonymous