Consider the Nichrome wire (D = 1 mm. Pe = 10-6 m, k = 25
Question:
Consider the Nichrome wire (D = 1 mm. Pe = 10-6 Ω ∙ m, k = 25 W/m ∙ K, ϵ = 0.20) used to fabricate the air heater of Problem 3.86, but now under conditions for which the convection heat transfer coefficient must be determined.
(a) For atmospheric air at 50°C and a cross-flow velocity of 5 m/s, what are the surface and centerline temperatures of the wire when it carries a current of 25 A and the housing of the heater is also at 50°C?
(b) Explore the effect of variations in the flow velocity and electrical current on the surface and centerline temperatures of the wire.
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Related Book For
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine
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