Chapter 7, Problem 7.129P

In a paper-drying process, the paper moves on a conveyor belt at 0.2 m/s, while dry air from an in-line array of round jets (Figure 7.18b) impinges normal to its surface. The nozzle diameter and pitch are $D=20\text{mm}$ and $S=100\text{mm,}$ respectively, and the nozzle-to-paper separation is $H=200\text{mm}\text{.}$ Air exits the nozzle at a velocity and temperature of 20 m/s and300 K, While the wet paper is maintained at 300 K. In $\text{kg/s}\cdot {\text{m}}^{\text{2}}$ what is the average drying rate of the paper?