Condensation heat transfer of herringbone micro fin tubes
Condensation heat transfer of herringbone micro fin tubes
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DOI：
10.1016/s1290-0729(02)01358-3
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发表时间：
2002-06
影响因子：
4.5
通讯作者：
A. Miyara;Yusuke Otsubo
中科院分区：
文献类型：
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作者：
A. Miyara;Yusuke Otsubo
对R410A在光管、螺旋微肋管和三种不同肋高和螺旋角的人字形微肋管中的管内冷凝进行了实验研究。在人字形微翅片管中，微翅片在翅片发散部分起去除液体的作用，在翅片会聚部分起收集液体的作用。在高质量流速区，所有人字形管的换热系数均高于螺旋微肋管。在低质量流速区，人字形微肋管的传热系数略低于螺旋微肋管。螺旋角越小，换热系数越低，翅片高度对换热影响越小。螺旋角较小的人字形管的压降低于螺旋微肋管，而其它管的压降较高。以R123为工质，观察了人字形管的流动形态，并对强化传热机理进行了探讨。
Experiments of in-tube condensation of R410A were carried out for a smooth tube, a helical micro fin tube and three types of herringbone micro fin tubes, which have different fin height and helix angle. In the herringbone micro fin tube, the micro fins work to remove liquid at fin-diverging parts and collect liquid at fin-converging parts. In the high mass velocity region the heat transfer coefficients of all the herringbone tubes are higher than those of the helical micro fin tube. In the low mass velocity region, however, the heat transfer coefficients of the herringbone micro fin tubes are slightly lower than those of the helical micro fin tube. The heat transfer coefficient is lower for smaller helix angle tube and effect of fin height on the heat transfer is small. Pressure drop of the herringbone tube of which helix angle is small is lower than that of the helical micro fin tube, while that of other tubes is higher. Flow configurations of the herringbone tubes were observed with R123 as working fluid and the heat transfer enhancement mechanism is discussed.