Dry air at 35C and a velocity of 10 m/s flows over a thin-walled tube of 20-mm

Dry air at 35°C and a velocity of 10 m/s flows over a thin-walled tube of 20-mm diameter and 200-mm length, having a fibrous coating that is water-saturated

To maintain an approximately uniform surface temperature of 27°C, water at a prescribed flow rate and temperature passes through the tube.

(a) Considering the heat and mass transfer processes on the external surface of the tube, determine the heat rate from the tube.

(b) For a flow rate of 0.025 kg/s, determine the inlet temperature, Tm.i' at which water must be supplied to the tube.

Transcribed Image Text:

Air T= 35°C V= 10 m/s Saturated surface condition Water T, =27°C m, Tai