Transient Heating of a Concrete Wall. A wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of 10°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m² · K, the thermal diffusivity is 1.74 x 10~3 m²/h, and the thermal conductivity is 0.935 W/m · K. (a) Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K). (b) Calculate the temperature at a point 0.152 m below the surface at this same time. Ans. (a) at/x = 0.25, t = 13.4 h

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Steady State Model

The steady-state model typically states that the entire universe is always enlarging, although it balances a fixed average density and matter that is being constantly generated to make new galaxies, star forms at a similar rate that the previous ones get indistinguishable due to the growing range and velocity of recession.