and the expected results led to further investigation of the procedures, assumptions, and equations used for the simulation. We would like to offer the following comments.In the equation for the heat transfer coefficient h3RADI for radiation from the inner kiln wall to the solid material, the "correction factor, f," is introduced to account for "the radiant energy that is absorbed by the gas." If that is truly its purpose, a corresponding factor should also appear in the gas-to-inner kiln wall heat transfer calculation: any radiqnt energy absorbed by the gas will surely affect the temperature of the gas. But the wall is heated only by the gas, and therefore cannot be at a higher temperature than the gas. Thus radiant heat cannot be transferred from the wall to the higher temperature gas; the heat goes in the qther direction, and is accounted for in the gas-to-inner wall calculation. (Only the net heat transfer from gas to wall is important; if the wall does in fact re-radiate to the gas, this only reduces the net heat transfer from gas to wall by radiation, and is otherwise of no consequence.) In any case, because of the relatively small difference in temperature between the wall and gas in this region, radiant heat transfer between wall and gas is practically negligible.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.