The small Marketable Prototype (MPU) heat treating unit and quench system were developed for the many applications where only a single part or a small lot needs to be heat treated at a time such as in machine shops, educational institutions, and test facilities. Numerical analysis and testing were performed to gain insight to the effect of furnace chamber partial pressure on power input requirements. The numerical model allows conclusion that a computer code can predict the MPU furnace temperature vs. power input, or alternately predict the power requirement for a given temperature, for the whole range of partial pressures (O < P < Patm). For the first time an attempt is made to formulate the effects of both local pressure and temperature on thermal conductivity of the gas in a vacuum heat treat furnace model. Finally, it was quantitively shown that furnace power input requirements can be influenced by the type of gas, the partial pressure of the gas, shield emissivities, shield spacing, and the emissivity of the furnace cold wall.
|Original language||English (US)|
|Specialist publication||Industrial Heating|
|State||Published - Nov 1 1989|
All Science Journal Classification (ASJC) codes
- Fluid Flow and Transfer Processes