What is the solution for this question 5.49 A long cylinder of 30-mm diameter, initially at a uni-form temperature of 1000 K, is suddenly quenched in alarge, constant-temperature oil bath at 350 K. The cyl-inder properties are k = 1.7 W/m · K, c = 1600 J/kg · K,and p = 400 kg/m', while the convection coefficient is50 W/m? · K.(a) Calculate the time required for the surface of thecylinder to reach 500 K.(b) Compute and plot the surface temperature historyfor 0 5.39 Consider an acrylic sheet of thickness L = 5 mm thatis used to coat a hot, isothermal metal substrate at T,:300°C. The properties of the acrylic are p= 1990 kg/m',c = 1470 J/kg •K, and k = 0.21 W/m · K. Neglecting thethermal contact resistance between the acrylic and themetal substrate, determine how long it will take forthe insulated back side of the acrylic to reach its soft-ening temperature, Tsoft = 90°C. The initial acrylic tem-perature is T; = 20°C.%3D352 / 1046

5.39 Consider an acrylic sheet of thickness L = 5 mm that is used to coat a hot, isothermal metal substrate at T, = 300°C. The properties of the acrylic are p= 1990 kg/m², c = 1470 J/kg · K, and k = 0.21 W/m • K. Neglecting the thermal contact resistance between the acrylic and the metal substrate, determine how long it will take for the insulated back side of the acrylic to reach its soft- ening temperature, Tyoft = 90°C. The initial acrylic tem- perature is T; = 20°C. %3D 352/ 1046

5.39 Consider an acrylic sheet of thickness L = 5 mm that is used to coat a hot, isothermal metal substrate at T, = 300°C. The properties of the acrylic are p= 1990 kg/m², c = 1470 J/kg · K, and k = 0.21 W/m • K. Neglecting the thermal contact resistance between the acrylic and the metal substrate, determine how long it will take for the insulated back side of the acrylic to reach its soft- ening temperature, Tyoft = 90°C. The initial acrylic tem- perature is T; = 20°C. %3D 352/ 1046

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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