Question: A 1 D , thick steel plate ( k = 5 0 W / m - K , = 7 8 0 0 kg /

A 1D, thick steel plate (k =50 W/m-K,=7800 kg/m3, c =480 J/kg-K) initially
at Ti =300oC is exposed water jet impingement at 25oC. Assuming the plate is a
semi-infinite medium, determine the time required to cool a location 25 mm
below the steel surface to 50oC.

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