DEVELOPMENT OF THE INSTRUMENTATION AND MODELING FOR HEAT TRANSFER CHARACTERISTICS IN CFBC

This technical report summarizes the research conducted and progress achieved during the period from October 1, 1997 to March 30, 1998. Numerical modeling and simulation on the gas velocity and pressure were continued to predict the flow patterns in the CFB. The renormalization group k-e turbulence model was employed to improve the predictions of the near the wall flow, wall heat/mass transfer, and wake/vortex shedding behavior. This model could provide more accurate prediction of swirl than in standard k-E model. The air velocity profile was predicted in 2-D velocity vector of the slide plate. The aeration (secondary) air flow rate reduced air velocity and caused a strong gas mixing processes. The air flowed from the high pressure region into the low pressure region. The aeration air injection affected on its neighborhood pressure profile. Two eddies are formed at level k=15 which is symmetrical with the aeration air inlet center line. It is very interesting to note that the air stream flows from the lower pressure region into the high pressure region. Experimental measurements will be conducted to understand heat transfer characteristics in the CFB system. In addition, numerical modeling and simulation will be continued to predict the flow patterns, velocity, pressure, temperature, and heat flux with the heat transfer effect in the CFB system