A dielectric fluid at atmospheric pressure is heated with a 0.5-mm-diameter, horizontal platinum wire. Determine the temperature

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A dielectric fluid at atmospheric pressure is heated with a 0.5-mm-diameter, horizontal platinum wire. Determine the temperature of the wire when the wire is heated at 50% of the critical heat flux. The properties of the fluid are cp,1 = 1300 J/kg. K ∙ hfg = 142 kJ/kg, k1 = 0.075 W/m ∙ K, v1 = 0.32 x 10-6 m2/s, P1 = 1400 kg/m3, Pv = 7.2 kg/m3, σ = 12.4 x 10-3 N/m, Tsat = 34°C. Assume the nucleate boiling constants are CSJ = 0.005 and n = 1.7. For small horizontal cylinders, the critical heat flux is found by multiplying the value associated with large horizontal cylinders by a correction factor F, where F = 0.89 + 2.27 exp (- 3.44Co-1/2). The Confinement number is based on the radius of the cylinder, and the range of applicability for the correction factor is 1.3 < Co < 6.7 [11].

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Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

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