新型开缝翅片管壳侧传热与阻力特性

A novel type of slotted fin was designed. The flow and heat transfer characteristics of the novel slotted fin were studied by experiment and numerical simulation. The influences of fin pitch and relative slotted height on the heat transfer and resistance characteristics of the novel slotted fin were analyzed. The relevant flow and heat transfer correlation was obtained by power function multivariate nonlinear fitting. Research showed that the shell side comprehensive heat transfer performance of the novel finned tube was 1.46—1.64 times higher than that of the plain finned tube. When Reynolds number Re=9 500 and relative slotting height was 0.5，the fin pitch decreased from 1.6 mm to 1.0 mm，the air side Nusselt number Nu increased by 19.44%， the air side drag coefficient f increased by 39.54%， and comprehensive heat transfer performance increased by 6.88%. When the Reynolds number Re=9 500 and fin pitch was 1.2 mm， relative slotting height increased from 0.4 to 0.7， the air side Nu increased by 11.55%， the air side f increased by 3.14%， and comprehensive heat transfer performance increased by 9.84%. The calculation correlations of Nusselt number and resistance coefficient with average deviation less than 10% were finally proposed.