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A cylindrical stone mix concrete beam of diameter D 05 m initially at Ti 20°C is exposed to hot gases at T∞ 500°C The convection coefficient is

A cylindrical stone mix concrete beam of diameter D - 0.5 m initially at Ti = 20°C is exposed to hot gases at T = 500°C. The convection coefficient is h - 10 W/m2 ∙ K.

 

(a) Determine the centerline temperature of the beam after an exposure time of t - 6 h.

(b) Determine the centerline temperature of a second beam that is of the same size and exposed to the same conditions as in part (a) but fabricated of lightweight aggregate concrete with density 1495 kg/m3, thermal conductivity k 0.789 W/m ∙ K, and specific heat cp = 880 J/kg ∙ K

Jun 27 2020 View more View Less

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