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It is well known that wind makes cold air feel much colder as a result of the wind-chill effect, which is due to the increase in the convection heat transfer coefficient as a result of the increase in air velocity. The wind-chill effect is usually expressed in terms of the wind-chill factor, which is the difference between the actual air temperature and the equivalent calm-air temperature. For outdoor air temperature of 0 C, for example, the wind chill temperature -5 C at 20km/hr winds and -9 C at 60km/hr winds. That is, a person exposed to 0 C windy air at 20km/hr will feel as cold as a person exposed to -5 C calm air (air motion under 5 km/hr).For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 170-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34 °C. For a convection heat transfer coefficient of 15 W/(m2.°C), determine the rate of heat loss from this man by convection in still air at 20 °C. What would your answer be if the convection heat transfer coefficient was increased to 30 W/(m2.°C) as a result of winds? What is the wind-chill factor in this case?
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How significant have advances in information and communication technologies since the late 1980's been on how we do business? And how have the major types of businesses that exist changed over this time?
What is the composition, in atom percent, of an alloy that consists of 5.5 wt% Pb and 94.5 wt% Sn?
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