The products of combustion from a burner are routed toan
Chapter 8, Problem 8.44(choose chapter or problem)
The products of combustion from a burner are routed toan industrial application through a thin-walled metallicduct of diameter Di?1 m and length L?100 m. Thegas enters the duct at atmospheric pressure and a mean temperature and velocity of Tm,i?1600 K andum,i?10 m/s, respectively. It must exit the duct at atemperature that is no less than Tm,o?1400 K. What isthe minimum thickness of an alumina-silica insulation(kins?0.125 W/m?K) needed to meet the outletrequirement under worst case conditions for which theduct is exposed to ambient air at T??250 K and across-flow velocity of V?15 m/s? The properties ofthe gas may be approximated as those of air, and as afirst estimate, the effect of the insulation thickness onthe convection coefficient and thermal resistance asso-ciated with the cross flow may be neglected.
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