heat transfer - show your work (5) Consider two coaxial cylinders of radii r1 5

Question

heat transfer - show your work

(5) Consider two coaxial cylinders of radii r1 5 cm and r2 15 cm which are maintained at Ti 1000 K and T2 300 K respectively. The emissivity for the surfaces are El 0.6 and e2 0.9, respectively (a) Calculate therate ofradiation exchangebetween the cylindersper meter length of the cylinder. (b) A radiation shield of radius rs 10 cm having an emissivity E2 0.1 (on both sides) is placed coaxially between the two cylinders. (i) Calculate the radiation heat transfer rate (p er meter length of the cylinder between cylinders l and 2 with the shield present, and (ii) determine the equilibrium temperature T3 of the shield.

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