Experimental investigation into the heat transfer and pressure drop performance of sintered high porosity media
Experimental investigation into the heat transfer and pressure drop performance of sintered high porosity media
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DOI：
10.1016/j.applthermaleng.2021.117284
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发表时间：
2021-09
影响因子：
6.4
通讯作者：
R. Watanabe;Takuto Kobayashi;Y. Otomo;A. Akisawa;Y. Ueda;K. Enoki
中科院分区：
文献类型：
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作者：
R. Watanabe;Takuto Kobayashi;Y. Otomo;A. Akisawa;Y. Ueda;K. Enoki
有一种利用多孔介质来提高热管传热性能的方法。然而，作为多孔结构之一的纤维结构的研究却很少。此外，通过烧结传热管和多孔介质，可以显著降低热阻，并且可以预期提高传热。因此，在这项研究中，我们实验研究了传热管的传热和压力损失由烧结纤维多孔介质。试验段的长度为150 mm，传热管内加热至200 °C的干燥空气和外部饱和温度为2 °C的异丁烷（R600a）沿相同方向流动。采用纤维状多孔介质烧结而成的传热管，与传统传热管相比，多孔部分的传热系数可达20倍左右。另一方面，压降比常规管高约50倍。此外，每单位长度的压降表示为速度的二次函数，并计算渗透率。通过使用该渗透率定义管摩擦系数，证实了其可以以与具有泡沫结构的多孔介质相同的方式组织。
There is a method of using porous media to improve the heat transfer performance of the heat tube. However, there are few studies on the fiber structure, which is one of the porous structures. Furthermore, by sintering the heat transfer tube and the porous media, the thermal resistance can be significantly reduced and the heat transfer can be expected to be improved. Therefore, in this study, we experimentally investigated heat transfer and pressure drop in heat transfer tubes made by sintering fibrous porous media. The length of the test section was 150 mm, and dry air heated at 200 °C inside the heat transfer tube and isobutane (R600a) with saturation temperature of 2 °C outside were flowed in the same direction. Tubes sintered with fibrous porous media, compared to the conventional heat transfer tube, the heat transfer coefficient of porous part was up to about 20 times. On the other hand, the pressure drop was about 50 times higher than that of the conventional tube. In addition, the pressure drop per unit length was expressed as a quadratic function of velocity, and the permeability was calculated. By defining the tube friction factor using this permeability, it was confirmed that it can be organized in the same way as porous media with foam structures.