锯齿螺旋翅片管束换热和阻力特性关联式的比较

Comparison of the Correlation Formulae for Calculating the Heat Exchange and Resistance Characteristics of Serrated Spirally-finned Tube Bundles

首先,对已有的锯齿螺旋翅片管换热与阻力特性关联式进行了整理与总结,继而通过对12个锯齿螺旋翅片管束进行风洞实验,比较和验证了相关的换热与阻力特性关联式。结果表明:(1)不同研究者所提出关联式的预测结果相差较大;(2)Weierman1976、ESCOA1979及Chen1998关联式的预测结果与实验结果相符较好,偏差均在20%以内,其中ESCOA1979关联式与实验结果相符最好,偏差在10%以内;(3)相同条件下与连续螺旋翅片管关联式预测结果相比,锯齿螺旋翅片管翅侧换热增大较多,而阻力变化不大。

The currently available correlation formulae for calculating the heat exchange and resistance characteristics of serrated spirally-finned tubes were first sorted and summarized.Afterwards,based on the wind tunnel test results of 12 serrated spirally-finned tube bundles,the correlation formulae for calculating relevant heat exchange and resistance characteristics were verified and compared.It has been found that 1) the results predicted by using correlation formulae proposed by various researchers differ greatly,2) the results predicted by using Weierman 1976,ESCOA1979 and Chen1998 correlation formula are in relatively good agreement with the test results,all the deviations are within20%,among which the results predicted by using the ESCOA1979 correlation formula is in best agreement with the test ones,its deviation being within 10%,3) under the same conditions,compared with the results predicted by using the correlation formula for continuous spirally-finned tubes,the increase in the heat quantity exchanged inside and outside the serrated spirally-finned tubes is relatively more but the change in the resistance is not big.