【摘要】 竖插翅片微通道换热器表面积尘导致其长效性能衰减。文章建立了颗粒物沉积仿真模型，研究了竖插翅片表面积灰分布特性及其对换热器性能的影响。结果表明，积灰分布特性受颗粒物粒径和空气流速的显著影响：小粒径颗粒物主要沉积在翅片迎风面的百叶窗区域，而大粒径颗粒物则沉积在背风面。沉积率随粒径增加先增加后减小，峰值为粒径10μm。小粒径颗粒物沉积率随空气流速增大而增加，大粒径颗粒物沉积率则先增大后减小。积灰厚度的增加导致Nu下降，f因子增加以及性能评价因子(PEC)减小。当Re=1 100时，0.15 mm积灰厚度使Nu降低了4.0%,f增加了61.6%,PEC减少了18.2%。研究结果为竖插翅片换热器的长效性能提升提供了理论依据。更多还原

【Abstract】 Air-side particle deposition leads to the long-term performance degradation of vertical-fin microchannel heat exchangers. This study develops the particle deposition simulation model to investigate the dust particles distribution characteristics on the fin surface and its impact on heat exchanger performance. The results show that the dust particles distribution is significantly affected by particle size and air velocity. Smaller particles predominantly deposit on the windward louvers of the fins, while larger particles accumulate on the leeward side. The deposition rate initially increases with particle size up to a peak at 10 μm and then decreases. The deposition rate of smaller particles increases with air velocity, whereas that of larger particles first increases and then decreases. An increase in dust thickness leads to a decrease in Nusselt number(Nu), an increase in friction factor(f), and a reduction in performance evaluation factor(PEC). Specifically, at Re=1 100, a 0.15 mm dust thickness results in a 4.0% reduction in Nu, a 61.6% increase in f, and an 18.2% decrease in PEC. The findings provide a theoretical basis for enhancing the long-term performance of vertical-fin heat exchangers.更多还原