Flow boiling heat transfer with HFC mixtures in a smooth horizontal tube. Part II: Assessment of predictive methods
Flow boiling heat transfer with HFC mixtures in a smooth horizontal tube. Part II: Assessment of predictive methods
复制标题
HFC 混合物在光滑水平管中流动沸腾传热。
DOI：
10.1016/j.expthermflusci.2004.03.004
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发表时间：
2005
影响因子：
3.2
通讯作者：
G. Vanoli
中科院分区：
文献类型：
--
作者：
A. Greco;G. Vanoli
在内径为6 mm、长为6 m的不锈钢光滑水平管内，利用焦耳效应对R410 A和R404 A的管内传热特性进行了实验研究。蒸发压力在3至12巴的范围内变化，制冷剂质量通量在290至1100 kg/m2 s的范围内变化，热通量在11至39 kW/m2的范围内变化。在本文中，注意力集中在实验结果和理论结果预测与最知名的相关文献之间的比较。发现与Kandlikar [J. Heat-Transfer，112（1990）219]的关联结果最一致。本文提出了一种修正的Kandlikar关联式，用于预测试验装置获得的局部换热系数。为了考虑减压对传热系数的影响，引入了一个修正因子来增强核态沸腾项的影响。
In tube heat transfer characteristics of R410A and R404A have been experimentally investigated in a smooth horizontal tube made of stainless steel with an inner diameter of 6 mm and a length of 6 m, uniformly heated by the Joule effect. The evaporation pressures has been varied within the range from 3 to 12 bar, the refrigerant mass flux within the range from 290 to 1100 kg/m2s and the heat flux within the range from 11 to 39 kW/m2. In this paper attention is focused on the comparison between experimental results and theoretical results predicted with the most known correlations from literature. The best agreement was found with the results of the correlation of Kandlikar [J. Heat-Transfer, 112 (1990) 219]. A modification of the Kandlikar correlation has been proposed in the present paper to predict the local heat transfer coefficients obtained with the test facility. A correction factor that enhance the influence of the nucleate boiling term has been introduced to take into account the influence of the reduced pressure on the heat transfer coefficients.