以单根外开V型槽换热管为研究对象，采用CFD数值模拟手段研究了壁面过冷度ΔT_m、槽宽b和槽角θ对冷凝传热性能的影响规律，推导了换热管的临界管长L_cr与有效周长S_cr的表达方式。结果表明，ΔT_m、b和θ的改变均会影响各部分局部热流密度q'；通过管长方向局部热流密度发现ΔT_m、b和θ的改变影响临界管长L_cr和有效周长S_cr，推导建立了L_cr和S_cr与ΔT_m、b以及θ的函数关系，为新型槽管的设计提供了参考。

Taking a single heat exchanger tube with external V-groove as the research object,Computational Fluid Dynamics (CFD) numerical simulation method is employed to explore the impact of supercooling degree ΔT_m,groove width b and groove angle θ on condensation heat transfer performance.Besides,the function relationship between critical length L_cr and effective perimeter S_cr is analyzed.The result shows that by calculating local heat flux density q' along the tube length direction,the changes of ΔT_m,b and θ are found to affect q' on every region of the tube.ΔT_m,b and θ are found to affect critical length L_cr and effective perimeter S_cr.Therefore,functional relationship between L_cr and S_cr with ΔT_m,b and θ is explored,which provides reference for engineering applications and the development of new groove tube.

金东旭(1995-),男,硕士生