A study on flow and heat transfer characteristics of a constructal bifurcation filler in the circular tube
A study on flow and heat transfer characteristics of a constructal bifurcation filler in the circular tube
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圆管内结构分叉填料流动与传热特性研究
DOI：
10.1016/j.applthermaleng.2020.116205
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发表时间：
2021-01
影响因子：
6.4
通讯作者：
Wei Liu
中科院分区：
文献类型：
--
作者：
Minjie Yu;Xiaotian Lai;Hui Xiao;Zhichun Liu;Wei Liu
多孔介质在能源系统中有着广泛的应用。然而，多孔介质造成的较大流动阻力制约了能量的利用和转化效率。为了降低流动阻力，基于结构概念和流体扰动强化思想，提出了一种结构分叉填料作为多孔介质填料的替代方案。将两种填料分别装入圆管内，对其热水力特性进行了研究和比较。分析了两种管道的流体流动和传热机理。结构分岔填料强化管内换热的主要机理是流体扰动加剧。此外，与多孔介质填料相比，结构分叉填料的管道流动阻力明显降低，降低幅度为78.51 ~ 93.33%。同时，与传统的流体扰动强化元件相比，构造分岔填料具有类似于多孔介质的优异温度均匀性。效率评价标准值为3.66 ~ 8.77。结果表明，结构分岔填料具有优越的综合性能，是减小流动阻力、提高能量利用效率的有效解决方案。最后，研究了钢丝网间距和斜角α等结构参数对结构分岔填料管热工性能的影响。
Porous media are applied extensively in energy systems. However, the large flow resistance caused by porous media restricts the energy utilization and conversion efficiency. To reduce flow resistance, a constructal bifurcation filler was proposed as an alternative to the porous media filler based on constructal concept and fluid disturbance intensification idea. The two fillers were fitted in the circular tubes to investigate and compare their thermo-hydraulic characteristics. The fluid flow and heat transfer mechanisms of the two types of tubes were analyzed. The fluid disturbance intensification is the dominant mechanism of the heat transfer enhancement in the tube with the constructal bifurcation filler. Moreover, the flow resistance of the tube with the constructal bifurcation filler is decreased significantly, by 78.51–93.33%, compared to the tube with the porous media filler. Meanwhile, in contrast to the traditional fluid disturbance intensification elements, an excellent temperature uniformity similar to that of porous media is obtained for the constructal bifurcation filler. Furthermore, the efficiency evaluation criteria value is 3.66–8.77. Thus, the constructal bifurcation filler was demonstrated to exhibit superior comprehensive performance and is an effective solution for diminishing the flow resistance and improving the energy utilization efficiency. Finally, the effects of structure parameters, such as the wire mesh pitchsand inclined angleα, on the thermo-hydraulic performance of the tube with the constructal bifurcation filler were investigated.
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DOI：
10.1016/j.ijthermalsci.2018.04.030
发表时间：
2018-12-01
影响因子：
4.5
作者：
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通讯作者：
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DOI：
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DOI：
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发表时间：
2015-06
影响因子：
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作者：
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DOI：
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发表时间：
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影响因子：
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作者：
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