ENGINEERIN 421/GMC_451_External_problems_chapter 6.pdf

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Problem 1: Experiments have been conducted on a metallic cylinder 12.7 mm in diameter and 94 mm long. The cylinder is heated internally by an electrical heater and is subjected to a cross flow of ai ... r in a low-speed wind tunnel. Under a specific set of operating conditions for which the upstream air velocity and temperature were maintained at V = 10 m/s and 26.2 °C, respectively, the heater power dissipation was measured to be P = 46 W, while the average cylinder surface temperature was determined to be Ts = 128.4 °C. It is estimated that 15% of the power dissipation is lost through the cumulative effect of surface radiation and conduction through the end-pieces. a) Determine the convection heat transfer coefficient from the experimental observations. b) Compare the experimental result with the convection coefficient computed from an appropriate correlation. Comment [Show More]

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