百叶窗翅片的传热与阻力性能试验关联式

Correlation of Flow and Heat Transfer Characteristics for Multi-louvered Fin

在风洞试验台上对20种不同结构参数的扁管百叶窗翅片进行了传热和流动阻力性能试验,分析比较了翅片间距和翅片高度对其表面对流换热系数和空气阻力性能的影响。同时通过对20种不同结构参数百叶窗翅片的336个试验数据点进行多元回归和F显著性检验,获得了j因子和f因子的经验关联式。在Re_(Lp)=200～3000范围内,j和f因子经验关联式拟合的最大误差范围分别为±10%和±12%,绝对平均偏差分别为4.1%和5.6%。

Experimental studies on the air - side heat transfer and pressure drop characteristics for 20 types of multi - louvered fin and flat tube heat exchangers were performed. A series of tests were conducted for air Reynolds number of 200 - 3000 based on the louver pith with different fin pitch, fin height, fin thickness ,fin louver angle and flow length, at a constant tube - side flow rate of 2.8 m^3/h.The air side thermal performance data were analyzed using the effectiveness - NTU method . The heat transfer coefficients and pressure drop data for different fin pitch Fp and fin height Fh were reported in terms of Colburn j - factor and Fanning friction factor f, as function of ReLp. The general correlations for j and f factors were derived by regression analysis and F test of significance. The correlations for the j and f factors have RMS errors of ±10% and ±12%, and the mean deviations of 4.1% and 5.6%, respectively, in the Re number range of 200 - 3000.