Question

To prevent condensa.on on a car’s windshield, warm air must be discharged on its inner surface, to keep it at a temperature higher than the dew point (10°C). Consider a windshield that is 0.8 m long, a car travelling at 70 mph in ambient air ( −15°C). If the car defroster discharges air at 40°C, flowing from the base of the windshield up, what should be the speed of air exi.ng the defroster to prevent condensa.on? For simplicity, consider the air flow generated by the defroster to be either laminar only or turbulent only, depending on the Reynolds number at the end of the windshield, and use Nusselt correla.ons that do not depend on the viscosity ra.os. Note: you will have to es.mate some parameters that are missing in the problem

          To prevent condensa.on on a car’s windshield, warm air must be discharged on its 
inner surface, to keep it at a temperature higher than the dew point (10°C). Consider 
a windshield that is 0.8 m long, a car travelling at 70 mph in ambient air ( −15°C). If 
the car defroster discharges air at 40°C, flowing from the base of the windshield up,
what should be the speed of air exi.ng the defroster to prevent condensa.on? For 
simplicity, consider the air flow generated by the defroster to be either laminar only 
or turbulent only, depending on the Reynolds number at the end of the windshield, 
and use Nusselt correla.ons that do not depend on the viscosity ra.os. Note: you 
will have to es.mate some parameters that are missing in the problem

Added by Fady A.

Question

Please give Ace some feedback