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An air heater consists of a steel tube (k = 20 W/m ∙ K), with inner and outer radii of r( = 13 mm and r2 = 16 mm, respectively, and eight integrally machined longitudinal fins, each of thickness t = 3 mm. The fins extend to a concentric tube, which is of radius r3 = 40 mm and insulated on its outer surface. Water at a temperature T∞,i = 90°C flows through the inner tube, while air at T∞,o = 25°C flows through the annular region formed by the larger concentric tube.
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