管排数对球突翅片管式换热器传热特性的影响
The effect of tube row number on heat transfer characteristics of the dimpled fin tube heat exchanger
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摘要: 通过数值对比研究了不同管排数对球突翅片管式换热器的换热和流动特性的影响.结果表明:随着管排数的增加,热量/压降(Q/Δp)和COP值逐渐减少,2排管的QΔP和COP值最大.在Re=1 138~3415范围内,2排管平均Nu数分别比3,4,5排管增大11.1%,21.7%,23.2%.流场图显示,不同管排数均因球突增强了扰动,而强化了换热,但4,5排管的温度场几乎无变化,说明管排数的增加并不能增强换热.综上2排管换热综合性能较好.Abstract: The effect of different tube row number on heat transfer and pressure drop characteristics of dimpled fin tube heat exchanger was investigated.The results showed that:the ratio of heat transfer rate and pressuer drop(Q/ΔP) and COP decreased with the increase of tube row number, Q/ΔP and COP of two-row tube was the biggest.Compared with the three, four, five-row tube, average Nu number of two-row tube increased by 11.1%, 21.7%, 23.2% at Re=1 138~3 415, respectively.The flow filed indicated that the arrangement of the dimple could intensify flow turbulence,which enhanced the heat transfer,but when the number of tube rows are 4 and 5, the temperature field changed little,which indicated that the heat transfer didn't change significantly when the number of tube rows increased.So the comprehensive performance of two row tube rows was better.
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Key words:
- dimpled fin tube heat exchanger /
- tube row number /
- enhanced heat transfer
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