Chapter 8, Problem 8.66P

A circular tube of diameter $D=0.2\text{mm}$ and length $L=100\text{mm}$ in1poes a constant heat flux of $q^n=20\times {10}^3{\text{W/m}}^2$ on a fluid with a mass flow rate of $m=0.\text{1g}/\text{s}$ . For an inlet temperature of $T_{m,i}=29°\text{C}$ . determine the tube wall temperature at x = L for pure water. Evaluate fluid properties at $\bar{T}=300\text{K}$ . For the same conditions, determine the tube wall temperature at $x=L$ for the nanofluid of Example 2.2.