A dielectric fluid at atmospheric pressure is heated witha
Chapter 10, Problem 10.20(choose chapter or problem)
A dielectric fluid at atmospheric pressure is heated witha 0.5-mm-diameter, horizontal platinum wire. Determinethe temperature of the wire when the wire is heated at 50%of the critical heat flux. The properties of the fluid arecp,l?1300 J/kg?K, hfg?142 kJ/kg, kl?0.075 W/m?K,?l?0.32?10?6m2/s, ?l?1400 kg/m3, ?v?7.2 kg/m3,??12.4?10?3N/m, Tsat?34?C. Assume the nucleateboiling constants are Cs,f?0.005 and n?1.7. For smallhorizontal cylinders, the critical heat flux is found by mul-tiplying the value associated with large horizontal cylin-ders by a correction factor F, where F?0.892.27exp(?3.44Co?1/2). The Confinement number is based onthe radius of the cylinder, and the range of applicability forthe correction factor is 1.3? o?6.7 [11]
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