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An electrical water (k = 0.61 W/m K) heater uses natural convection to transfer heat from a 1-cm-diameter by 0.65-m-long,

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An electrical water (k = 0.61 W/m· K) heater uses natural convection to transfer heat from a 1-cm-diameter by 0.65-m-long, 110 V electrical resistance heater to the water. During operation, the surface temperature of this heater is 120°C while the temperature of the water is 35°C, and the Nusselt number (based on the diameter) is 5. Considering only the side surface of the heater (and thus A = πDL), the current passing through the electrical heating element is
(a) 2.2 A

(b) 2.7 A

(c) 3.6 A

(d) 4.8 A

(e) 5.6 A

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The correct answer is d To solve this problem we can use the following equation Q h A T s T w where …View the full answer


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Related Book For  answer-question
Heat And Mass Transfer Fundamentals And Applications

Heat And Mass Transfer Fundamentals And Applications

ISBN: 9780073398181

5th Edition

Authors: Yunus Cengel, Afshin Ghajar

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Question Details
Chapter # 6- FUNDAMENTALS OF CONVECTION
Section: Problems
Problem: 113
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Question Posted: September 16, 2023 05:26:53
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