关键词: 数值模拟, 计算流体力学, 强化传热管, 管式裂解炉

Abstract: The flow and heat transfer characteristics of fortified induced turbulence (FIT) tube with inserts were studied with computational fluid dynamics (CFD). The momentum and energy equations were solved by using RNG turbulent flow model. The flow and heat transfer characteristics of FIT tube,namely velocity field,turbulent flow field,temperature field were presented and pressure drop,intensified heat transfer factors were calculated. The heat transfer of FIT tube was intensified because swirling flow instead of piston flow by using special tape placed inside the FIT tube caused more turbulence and hydrodynamic boundary layer was cut thinner. Multiple mechanism elements (radiation factor,surface factor,twist factor and boundary layer cutting factor) to intensify the heat transfer of furnace radiant tube were established in the analysis. Compared with plain tube,FIT tube showed a significant increase of heat transfer by about 20%,and could be used as a good heat transfer radiation tube.

Key words: numerical simulation, computational fluid dynamics, intensified heat transfer radiant tube, cracking furnace