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首页> 外文期刊>International Journal of Heat and Mass Transfer >Residence time distribution and heat transfer in circular pipe fitted with longitudinal rectangular wings
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Residence time distribution and heat transfer in circular pipe fitted with longitudinal rectangular wings

机译：带有纵向矩形翼的圆形管中的停留时间分布和传热

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摘要

Numerical simulations are used to analyze the heat and mass transfer in a circular pipe fitted with longitudinal rectangular vortex generators for Reynolds number between 7500 and 15,000 based on the pipe diameter. The aim of the present study is to test and quantify the mixing efficiency of a new solution able to avoid the bypass region that exists in the center of the high efficiency vortex static mixer (HEV), and also to enhance the heat transfer without increasing the pressure losses. The rectangular wings used here generate each a streamwise counter-rotating vortex pair sweeping the volume of the mixer and act as internal agitator on the flow. The particle dispersion is investigated by analyzing Poincare sections and by studying the residence time distribution (RTD). The two approaches show much better mass transfer performance and better mixing homogeneity for the new wings arrangement. The heat transfer is also investigated and it is shown that the thermal enhancement factor in the new arrangement is much greater than that of the conventional systems used in the industry. When compared to the HEV heat exchangers it is shown that the thermal enhancement in the present configuration reaches about 40% relative to the classic HEV and 15% relative to the reversed HEV.
机译：数值模拟用于分析装有纵向矩形涡流发生器的圆形管道的热和质量传递，基于管道直径，雷诺数在7500和15,000之间。本研究的目的是测试和量化一种新解决方案的混合效率，该解决方案能够避免存在于高效涡流静态混合器（HEV）中心的旁路区域，并且还可以在不增加换热器效率的情况下提高传热效率。压力损失。此处使用的矩形翼各自产生一个沿流向反向旋转的涡旋对，扫掠混合器的体积，并充当气流的内部搅拌器。通过分析庞加莱截面并研究停留时间分布（RTD），研究了颗粒的分散性。对于新的机翼布置，这两种方法显示出更好的传质性能和更好的混合均匀性。还研究了热传递，结果表明，新装置中的热增强因子比工业上使用的常规系统的热增强因子大得多。当与HEV热交换器相比时，显示出在当前构造中的热增强相对于经典HEV达到约40％，并且相对于反向HEV达到15％。

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