The laminar boundary layer theory is used to analyze the film condensation on a vertical plate. The calculated result is well consistent with the experiment and empirical relation of the laminar film condensation. A convection number E is presented,which shows the contribution of convection to heat-transfer in film condensation. When E is less than 1,the condensation region is controlled by conduction. When E is far less than 1,the region is called Nusselt region. When E is larger than 1,the region of condensation is controlled by convection. When E is much more than 1,Co_m is proportional to Re_L^1/3.
Circulating fluidized bed(CFB) reactors are preferred in chemistry and energy fields dueto its high uniformity of temperature and excellent mixing behavior of gas and s0lids. In orderto get a better general understanding of CFB flow structures, an advanced statistical methodis applied to extract information of solid fluctuation from three kinds of signal obtained bylocal laser probe measurements. The results show that excellent mixing between solid andgas is happened in the range of local time average solid concentration from 0.04 to 0.4.
