Consider a thin sheet of 20 cm (width) x 20 cm (length) × 1 cm (thickness) with its top surfacecovered by a coating layer (thickness 2 mm). The water is flowing over the coating layer with afree stream temperature of 20 °C and velocity of 10 m/s. All the other surfaces are well insulated,and the sheet and the coating have a uniform initial temperature of 95 °C (at t=0).U∞ = 10 m/sToo=20°C2 mmCoating1 cm SheetT=95°C20 cm m20 cmPassume:steady stateexternal flow•uniform initialteme @ coating(a) At t = 0, determine the heat transfer rate from the coating surface to the water. average(b) Determine the Biot number of the sheet.(c) How long does it take for the top surface of the sheet to be cooled to 30 °C?Properties of water: v₁ = 4.97×104 m²/s, k = 0.65 W/m K, d=0.143×10-6 m²/s, and Prw = 3.15.Properties of the sheet: ps = 8400 kg/m³, Cp.s= 420 J/kg K, and ks = 10 W/m K.Properties of the coating: kc = 0.04 W/m.K.

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Answered: Consider a thin sheet of 20 cm (width)…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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