Below Figure shows a liquid-to-air heat exchanger in which air flows at 50m3/h inside a re...

Below Figure shows a liquid-to-air heat exchanger in which air flows at 50m3/h inside a rectangular passage and around a set of five vertical tubes. Each tube is a 5-in steel tube with a wall thickness of 0.049 in. 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.