chitteshchandra56
17.09.2019 •
Physics
You've experienced convection cooling if you've ever extended your hand out the window of a moving vehicle or into a flowing water stream. with the surface of your hand at a temperature of 30°c, determine the convection heat flux for (a) a vehicle speed of 40 km/h in air at −8°c with a convection coefficient of 40 w/m2 · k and (b) a velocity of 0.2 m/s in a water stream at 10°c with a convection coefficient of 900 w/m2 · k. which condition would feel colder? contrast these results with a heat flux of approximately 30 w/m2 under normal room conditions
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