Chapter 8, Problem 8.69P

A healing contractor must heat $0.2kg/s$ of water from $\text{15}°\text{C}$ to $\text{35}°\text{C}$ using hot gases in cross flow over a thin walled tube.

Your assignment is to develop a series of design graphs that can be used to demonstrate acceptable combinations of tube dimensions (D and L) and of hot gas conditions ( $T_{\infty }$ and V) that satisfy this requirement. In your analysis, consider the following parameter ranges: $D=20,30,\text{or}40mm;L=3,4,\text{or}6m;T_{\infty }=250,375,\text{or}500°C;\text{and}20\le V\le 40m/s$ .