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, 1998 to March 31, 1999. Numerical simulation was conducted to predict the flow pattern, velocity and pressure, temperature, and heat transfer characteristics in the CFB system. The 2-D air velocity profiles showed the axial and tangential velocity profiles in the CFB riser. The small flow boundary layers were found near the CFB riser. The tangential velocity profile is characterized by injection of aeration air. The highest air pressure at the bottom of the heat transfer probe caused a strong gas mixing process in the CFB riser. The heat absorbing water-cooled heat transfer probe enclosing the CFB riser of the cold model was assumed. The gas temperature decreased along the flow direction of the heat transfer probe. The heat transfer characteristics was described by the heat flux changes in the CFB chamber. The higher heat flux was found at the bottom of the heat transfer probe. A large amount of heat is generated and removed via the neighboring the heat transfer probe. Numerical simulation will be continued to predict the flow patterns, velocity, pressure, temperature, and heat transfer characteristics in the CFB system