Fluid in an industrial application flows within a thin-walled tube having a circular cross section and diameter of 2.5 cm . Fluid enters the tube at
70\deg C
at a mass flow rate of 0.05
k(g)/(sec)
. Along the length of the tube, external ambient air creates an average heat transfer coefficient of
20(W)/(m^(2))-K
at
T_(\infty )=25\deg C
. If the tube is 25 m in length, calculate the outlet temperature of the fluid. State assumptions. [Fluid Properties:
\rho =963k(g)/(m^(3)),c_(p)=4209(J)/(k)g-K,\mu =306\times 10^(-6)N.(s)/(m^(2)),Pr=2.7,k=0.66(W)/(m)-K
] *Hint: Calculate the overall heat transfer coefficient, U.