A steel strip emerges from hot roll section of a steel mill at a constant speed of 0.1 m/s and a temperature of 5000C. The length, width and thickness of the steel strip are 10 m, 1 m and 0.003 m respectively. Air at a mean velocity and free stream temperature of 20 m/s and 200C respectively flows transversely over the strip. Density, specific heat and emissivity of steel strip, respectively, are 7850 kg/m3, 620 J/kg and 0.7. The thermal conductivity, kinematic viscosity and Prandti number for air at 200C. Neglect the variation in strip temperature across its width and thickness.
- Write the governing equation for the temperature distribution along the length of the strip.
- Neglecting radiation from the steel strip, derive an expression for the temperature of steel strip.
- Neglecting radiation from the steel strip, calculate the steel strip temperature at the tralling edge.
The following correlation for convection heat transfer may be used:
Symbols have the usual meaning.