交错布局的小直径管束中的流动和传热特性:一项实验研究

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Yanchen Fu, Han Qi, Guoqiang Xu, Weitong Liu, Lina Zhang
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引用次数: 0

摘要

对不同管径(2 毫米、3 毫米和 5 毫米)的交错管束的流动和传热特性进行了实验研究。在实验中,以排数(4-12)、空气质量速率(0.06kg/s-0.18kg/s)和横向管间距(S1/d=2、S1/d=3)为变量,研究了空气侧的流动阻力和传热特性。实验结果的三个主要结论如下:(1)在相同条件下,管径越小,空气侧对流传热系数越大。此外,实验中的努塞尔特数与Žukauskas 的经验相关性之间的偏差在-14% 到 -10%之间;(2)横向距离对传热的影响不明显,但对流传热系数随着排数的增加而显著增加;(3)管外压降随空气流速呈指数增加。特别是在直径较小的实验样品中,管子的外流阻力明显高于其他管子。最后,根据实验数据拟合出了小直径交错管束空气侧对流换热的新经验相关系数,希望能为管束换热器的更精确设计提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flow and Heat Transfer Characteristics in Small Diameter Tube Bundles with a Staggered Layout: an experimental study
An experimental research on flow and heat transfer characteristics of staggered tube bundles with different tube diameters (2mm, 3mm and 5mm) is conducted. In the experiment, the number of rows (4-12), the mass rate of the air (0.06kg/s-0.18kg/s), and the transverse tube pitch (S1/d=2, S1/d=3) are variables to study the characteristics of the airside flow resistance and heat transfer. The three main conclusions of the experimental results are as follows: (1) Under the same conditions, the smaller tube diameter leads to the larger airside convective heat transfer coefficient. Besides, the deviation between the Nusselt number of the experiment and the empirical correlation of Žukauskas is in the range between -14% and -10%; (2) The effect of transverse distance on heat transfer is not obvious, but the convective heat transfer coefficient increases significantly with the increase of row number; (3) The external pressure drop of the tube exhibits an exponential increase with the air flow rate. Particularly in the experimental samples with smaller diameters, the outflow resistance of the tube is noticeably higher compared to other tubes. Finally, new empirical correlations of the airside convection heat transfer for the small-diameter staggered tube bundles are fitted according to the experimental data, and it is hoped to provide a reference for the more accurate design of tube bundle heat exchangers.
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来源期刊
Journal of Enhanced Heat Transfer
Journal of Enhanced Heat Transfer 工程技术-工程:机械
CiteScore
3.60
自引率
8.70%
发文量
51
审稿时长
12 months
期刊介绍: The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.
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