A wind tunnel is being used to study the aerodynamics of a full-scale model rocket that is 30  cm long. Scaling for drag calculations are based on the Reynolds number. The rocket has an expected maximum velocity of 190 km/h. What is the Reynolds number at this speed? Assume  ambient air is at 20°C. The wind tunnel is capable of speeds up to 160 km/h; so an attempt is  made to improve this top speed by varying the air temperature. Calculate the equivalent speed  for the wind tunnel using air at 5°C and 65°C. Would replacing air with carbon dioxide provide  higher equivalent speeds?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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 A wind tunnel is being used to study the aerodynamics of a full-scale model rocket that is 30 
cm long. Scaling for drag calculations are based on the Reynolds number. The rocket has
an expected maximum velocity of 190 km/h. What is the Reynolds number at this speed? Assume 
ambient air is at 20°C. The wind tunnel is capable of speeds up to 160 km/h; so an attempt is 
made to improve this top speed by varying the air temperature. Calculate the equivalent speed 
for the wind tunnel using air at 5°C and 65°C. Would replacing air with carbon dioxide provide 
higher equivalent speeds?

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