In a laboratory, the drag forces that are generated on vehicles that carry are being studied posters (thin flat plates) on the ceiling, for this we first want to determine the coefficient of drag that is generated on a cart without carrying the sign using a force meter (case 1). The Projected frontal area of the carriage is 2 m2 and the force indicated by the meter in case 1 is 300N when moving at 27 m/s. Considering air conditions of T = 20° C, ρ = 1.2 kg/m3, ? = 1.5 ∗10−5m2/s: a) Calculate the drag coefficient of the trolley in case 1 b) Calculate the drag coefficient that is generated on a sign 1 meter long and 0.2 meters of height (flat plate) placed transverse to the flow moving at the same speed of the carriage as illustrated in case 2. The transition Reynolds number is known to be 5 ∗ 10^5 c) Calculate the drag force that is generated only on the plate (consider both sides) d) Draw the free body diagram of the carriage for case 2 and calculate the total force on the cart when the ad is placed on it.
In a laboratory, the drag forces that are generated on vehicles that carry are being studied
posters (thin flat plates) on the ceiling, for this we first want to determine the coefficient of
drag that is generated on a cart without carrying the sign using a force meter (case 1). The
Projected frontal area of the carriage is 2 m2 and the force indicated by the meter in case 1 is 300N
when moving at 27 m/s. Considering air conditions of T = 20° C, ρ = 1.2 kg/m3, ? = 1.5 ∗10−5m2/s:
a) Calculate the drag coefficient of the trolley in case 1
b) Calculate the drag coefficient that is generated on a sign 1 meter long and 0.2 meters
of height (flat plate) placed transverse to the flow moving at the same speed of the carriage
as illustrated in case 2. The transition Reynolds number is known to be 5 ∗ 10^5
c) Calculate the drag force that is generated only on the plate (consider both sides)
d) Draw the free body diagram of the carriage for case 2 and calculate the total force on the
cart when the ad is placed on it.
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