Air flowing through a pipe is heated by a constant heat flux

Air flowing through a pipe is heated by a constant heat flux coming from the pipe’s wall. If the velocity of the air increases, the outlet temperature a. Increases

b. Decreases

c. Stays the same

d. The heat transfer coefficient, h, is needed to determine the outlet temperature.

Solution

If velocity increase s then Reynolds number increases..then nusselt number increases.... But first we should determine the heat transfer coefficient... Option d is correct