For the glycerin described in Problem 9.31, compute the pressure drop for a horizontal duc...

For the glycerin described in Problem 9.31, compute the pressure drop for a horizontal duct 22.6 m long. All surfaces are copper.

Problem 9.31

Figure 9.20 shows a liquid-to-air heat exchanger in which air flows at 50 m3>h inside a rectangular passage and around a set of five vertical tubes. Each tube is a standard hydraulic steel tube, 15 mm OD × 1.2 mm wall. The air has a density of 1.15 kg>m3 and a dynamic viscosity of 1.63 × 10–5 Pa•s. Compute the Reynolds number for the air flow.

FIGURE 9.20