Condensation heat transfer and flow pattern inside a herringbone-type micro-fin tube
Condensation heat transfer and flow pattern inside a herringbone-type micro-fin tube
复制标题
DOI：
10.1016/s0140-7007(99)00037-7
复制
发表时间：
2000-03
期刊：
影响因子：
--
通讯作者：
A. Miyara;K. Nonaka;M. Taniguchi
中科院分区：
文献类型：
--
作者：
A. Miyara;K. Nonaka;M. Taniguchi
对R410a和R22在人字形微翅片管内的冷凝换热和压降进行了测量，并与螺旋微翅片管和光滑管的冷凝换热和压降进行了比较。在高质量流速区，人字形微翅片管的换热系数高于螺旋微翅片管，而在低质量流速区，人字形微翅片管的换热系数略低。然而，人字形微翅片管的压力降高于螺旋微翅片管。观察了人字形微翅片管的流动形态，并对其强化换热机理进行了探讨。螺旋微翅片管的换热系数和压降与先前提出的关联式吻合较好，而人字形微翅片管的换热系数和压降计算值高于预测值。提出了人字形微翅片管压降和换热系数的初步关联式。
Condensation heat transfer and pressure drop of R410A and R22 in a newly proposed herringbone-type micro-fin tube are measured and compared to those of a helical micro-fin tube and a smooth tube. The heat transfer coefficient of the herringbone micro-fin tube is higher than that of the helical micro-fin tube in the high mass velocity region, while it has slightly lower value in the low mass velocity region. Pressure drop of the herringbone micro-fin tube is, however, higher than that of the helical micro-fin tube. Flow patterns of the herringbone micro-fin tube are observed and the heat transfer enhancement mechanism is discussed. The heat transfer coefficient and pressure drop of the helical micro-fin tube is predicted well with previously proposed correlations, while those of the herringbone-type micro-fin tube has higher value than the predicted values. Preliminary correlations for the pressure drop and the heat transfer coefficient are proposed for the herringbone micro-fin tube.