Answer to Question #183121 in Mechanical Engineering for luke

Question #183121

A bakelite coating is to be used with a 10mm diameter conducting rod whose surface is maintained at 200C by passage of an electrical current. The rod is in a fluid at 25C and the convection coefficient is 140W/m2-K. What is the critical radius associated with the coating? (millimeters) *




1
Expert's answer
2021-04-22T07:23:38-0400

conducting rod diameter, D1 = 10mm


conducting road surface maintained at Ti = 200°C


rod subjected to a fluid T = 25°C, h = 140 W/m²K


bakelite thermal conductivity, k = 1.4 W/m²K


Since the radii of the bare and insulated rod are assumed equal, critical radius can be found as;


rcritical = "\\dfrac{k}h" = "\\dfrac{1.4}{140}" = 0.01m


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