A

2.0-cm

-diameter tube havitig a relative roughness of 0.001 is maintained at constant wall temperature of

90\\\\deg C

. Water enters the tube at

40\\\\deg C

and leaves at

60\\\\deg C

. If the entering velocity is

3(m)/(s)

, calculate the length of tube necessary to accomplish the heating.

A 2.0-cm-diameter tube having a relative roughness of 0.001 is maintained at constant wall temperature of 90C. Water enters the tube at 40C and leaves at 60C. If the entering velocity is 3m/s, calculate the length of tube necessary to accomplish the heating