On the areal coalification index and the thermal coalification index of the artificial coal : Heat transfer of the furnace

摘要

Coalification index on the artificial coalification was considered from both points of areal aspect and thermal one. The thermal coalification index was calculated by the difference between Jouleu27s heat introduced into the furnace and that heat transferred from the electric furnace through the cylindrical part and its disk sides to air. Heat transferred from the cylindrical part, which was supposed to be a plane surface with air flowing parallel to it, was calculated by the equation of Pohlhausen. Furthermore heat transferred from its disk sides supposed to be flowed air at right angles to angular pipe was calculated by the equation of Nu=_cR_e^m.