The wind chill, which is experienced on a cold, windy day, is related to increased e surrounding atmosphere. Consider a layer of fatty tissue that is 3 mm thick and whose interior surface is maintained at a temperaheat transfer from exposed human skin to thture of 36oC. On a calm day the convection heat transfer coefficient at the outer surface is 25 W/m2×K, but with 30 km/h winds it reaches 65 W/m2×K. In both cases the ambient air temperature is - 15oC.
(k=0.3 W/m.K)
(a) What will be the skin outer surface temperature for the calm day? For the windy day?
(b) What temperature would the air have to assume on the calm day to produce the same heat loss occurring with the air temperature at - 15oC on the windy day?