Experimental evaluation of pairs of inline tubes of different size as components for heat exchanger tube bundles

Sofia G. Mavridou; Efstathios Konstandinidis; Demetri G. Bouris

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Experimental evaluation of pairs of inline tubes of different size as components for heat exchanger tube bundles

机译：成对的不同尺寸的成对管道作为热交换器管束的实验评估

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摘要

A passive heat exchanger design for process intensification, reduced flow fluctuations, pressure-drop and fouling is evaluated experimentally. A primal geometry of two unequally sized cylinders placed in tandem arrangement under cross-flow is initially examined in order to establish the effect on the wake fluctuations, compared to the single cylinder case. Three pairs of cylinders were considered with a diameter ratio of d/D - 0.5 and at different longitudinal pitches, S_L/D - 1.5, 2.0 and 2.5, at the subcritical Reynolds number of Re_D = 3900. The streamwise velocity fluctuations in the wake of the cylinders were found to be lower for the cylinder pairs as compared to the case of the single cylinder. The preferred primal arrangement with unequally sized cylinders was extended to form a heat exchanger tube bundle, where the effect of the transverse distance between the tubes (S_T/D) was also studied. Three tube bundle configurations were examined with d/D - 0.5, S_L/D = 1.5 and S_T/D = 3.6 and S_T/D = 2.5, and a common arrangement with d/D = 1.0, S_L/D - 2.5 and S_T/D = 3.6. Measurements were performed with regard to the heat transfer on the external surface of the tubes and the pressure drop across each configuration. When compared to the conventional tube bundle arrangement, the arrangement with d/D-0.5, S_L/D=1.5 and S_T/D = 3.6 led to specific (per unit volume) heat transfer enhancement by 40% with indications of a negligible penalty in pressure drop.

机译：实验评估了用于过程强化，减少流量波动，压降和结垢的无源换热器设计。为了确定对尾波起伏的影响，与单缸相比，在交叉流下串联放置的两个不等大小的缸的基本几何形状首先要进行检查。考虑三对圆柱体，其直径比为d / D-0.5，并且在不同的纵向螺距S_L / D-1.5、2.0和2.5时，亚临界雷诺数为Re_D = 3900。与单个气缸的情况相比，发现气缸对的气缸更低。扩展了具有不等大小圆柱体的首选基本布置，以形成换热器管束，其中还研究了管之间的横向距离（S_T / D）的影响。使用d / D-0.5，S_L / D = 1.5和S_T / D = 3.6和S_T / D = 2.5以及d / D = 1.0，S_L / D-2.5和S_T / D ＝ 3.6。关于在管的外表面上的热传递和在每种构造上的压降进行测量。与传统的管束布置相比，d / D-0.5，S_L / D = 1.5和S_T / D = 3.6的布置导致比热（每单位体积）提高了40％，而表明压力下降。

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来源
《International Journal of Heat and Mass Transfer》 |2015年第11期|280-290|共11页
作者
Sofia G. Mavridou; Efstathios Konstandinidis; Demetri G. Bouris;
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作者单位

Department of Mechanical Engineering, University of Western Macedonia, Bakola & Sialvera, 50100 Kozani, Greece;

Department of Mechanical Engineering, University of Western Macedonia, Bakola & Sialvera, 50100 Kozani, Greece;

School of Mechanical Engineering, National Technical University of Athens, 15780 Zografou, Greece;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Heat exchanger; Tube bundle; Unequal tube diameters; Fouling; Pressure drop;

机译：热交换器;管束;管子直径不相等;结垢;压力下降;

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Experimental evaluation of pairs of inline tubes of different size as components for heat exchanger tube bundles

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