热管换热器模拟重要参数的选择

Calculation of Certain Important Parameters in Simulation of Heat Pipe Exchanger

采用单根热管流固耦合传热模型,模拟当量导热系数的取值对热管换热量的影响;并利用DO模型模拟不同成分的烟气在不同工况下的辐射换热量。结果表明:适当的导热系数可以合理地模拟热管换热器;烟气吸收系数对辐射换热量的影响不大,烟气温度才是辐射换热量的决定因素。根据场协同理论进一步分析,表明烟气温度越高,辐射换热所占百分比越大,场协同性越好。

The impact of effective thermal conductivity about heat exchange of heat pipe was explored by a fluid-solid interaction heat transfer model for a single heat pipe. The radiation heat transfer rate of distinct components gas in different conditions was calculated by DO model. The simulation results show that the appropriate thermal conductivity can be used for the simulation of heat pipe exchanger, but the gas absorption coefficient has little effect on radiation heat transfer rate, and the gas temperature is the determining factor of radiation heat transfer. By analyzing the numerical results from the viewpoint of field synergy principle, the radiation heat transfer rate is greater in total heat transfer and the coordination between the fluid velocity and the temperature gradient is better with the increase of gas temperature.