Water at (290 mathrm{~K}) and (0.25 mathrm{~kg} / mathrm{s}) flows through a Teflon tube ((k=0.35 mathrm{~W} /
Question:
Water at \(290 \mathrm{~K}\) and \(0.25 \mathrm{~kg} / \mathrm{s}\) flows through a Teflon tube \((k=0.35 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K})\) of inner and outer radii equal to 10 and \(14 \mathrm{~mm}\), respectively. A thin electrical heating tape wrapped around the outer surface of the tube delivers a uniform surface heat flux of \(2500 \mathrm{~W} / \mathrm{m}^{2}\), while a convection coefficient of \(25 \mathrm{~W} / \mathrm{m}^{2} \cdot \mathrm{K}\) is maintained on the outer surface of the tape by ambient air at \(300 \mathrm{~K}\). What is the fraction of the power dissipated by the tape, which is transferred to the water? What is the outer surface temperature of the Teflon tube?
Step by Step Answer:
Fundamentals Of Heat And Mass Transfer
ISBN: 9781119220442
8th Edition
Authors: Theodore L. Bergman, Adrienne S. Lavine