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DN型波纹板传热元件是回转式空气预热器中的常用板型,但有关DN板的研究报道较匮乏.文中采用一种改进的单吹瞬态技术对DN板的传热、阻力特性展开实验研究,测量DN板的传热和阻力系数.实验结果表明DN板的传热、阻力性能与DU板相当,而介于CC板和平行平板之间.实验发现DN板的传热系数j和阻力系数f随着雷诺数Re的增大而减小.根据本文实验数据拟合了DN板特性参数j和f数的实验关联式.“,”The double notched (DN) plate is commonly used in rotary air preheaters,but relevant investigations are rare.Thus,thermal-hydraulic performances of the DN plate were investigated in this paper.A refined single-blow,transient technique was used to measure the overall mean heat transfer coefficients and friction factors.The measured results show that the performance of the DN plate approaches that of the double undulated (DU) plate and lies between that of the cross corrugated (CC) plate and the parallel plate.The Colburn factor j and the Darcy friction factorfof the DN plate decrease with increasing Reynolds numbers,Re.Based on the measured data,experimental correlations forj and fare established.