Large brass plates initially at 20 ° C are heated in an oven . The surface temperature of plates leaving the oven mainta

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Large brass plates initially at 20 ° C are heated in
an oven . The surface temperature of plates leaving the oven
maintained at 500 ° C is to be determined after a lapse of 7 min .
Assumptions : 1. Heat conduction in the plate is one - dmensional
since the plate is large relative to the thickness and there is
thermal symmetry about the central plane . 2. The thermal
properties of the plate and the heat transfer coefficient are
constant . 3. The properties of brass at room temperature ( 20 ° C
) are k = 110 W / mK . p = 8530 kg / m³.c = 380 J / kgK and a =
33.9 x 10-6 m² / s .