3-60. A 1 cm-thick slab of hard rubber, initially at 15C, is heated by saturated steam...

Transcribed Image Text:

3-60. A 1 cm-thick slab of hard rubber, initially at 15C, is heated by saturated steam at 140C. As soon as the center temperature reaches 125C, the slab is removed and allowed to cool in 25C air until the center temperature falls to 35C. How long does each stage take? Assume a very large heat transfer coefficient for the heating process, and a value of 8 W/m K for the cooling process. 3-60. A 1 cm-thick slab of hard rubber, initially at 15C, is heated by saturated steam at 140C. As soon as the center temperature reaches 125C, the slab is removed and allowed to cool in 25C air until the center temperature falls to 35C. How long does each stage take? Assume a very large heat transfer coefficient for the heating process, and a value of 8 W/m K for the cooling process.

Answer rating: 100% (QA)

Stage 1 Heating by Saturated Steam Given Initial temperature of the slab Tinitial 15C Final temperat... View the full answer