Subcooled Flow Boiling Heat Flux Enhancement Using High Porosity Sintered Fiber
Subcooled Flow Boiling Heat Flux Enhancement Using High Porosity Sintered Fiber
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DOI：
10.3390/app11135883
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发表时间：
2021-07-01
影响因子：
2.7
通讯作者：
Enoki, Koji
中科院分区：
文献类型：
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作者：
Galicia, Edgar Santiago;Otomo, Yusuke;Enoki, Koji
在现代冷却系统中，迫切需要采用被动的方法来提高过冷沸腾的热流密度。已经研究了许多方法，包括处理表面和扩展表面。对表面附着高烧结纤维强化过冷流动沸腾进行了实验研究。在三种不同的质量流量（200、400和600 kg中心点m（-2）中心点s（-1））和三种不同的入口过冷温度（70、50、30）下，比较了一个裸表面（0 mm）和四个多孔厚度（0.2、0.5、1.0、2.0 mm）。在大气压下的去离子水被用作工作流体。结果表明，多孔体可以提高热流密度，降低壁温。然而，较高的多孔厚度呈现出减少的热通量相比，裸露的表面。使用高速相机记录气泡形成和图案流。在较高的入口过冷温度下，气泡尺寸和形成通常较小。多孔体的成核位置增加、加热表面积增加、多孔体的供水能力和蒸汽捕集能力的提高是热流密度提高和壁面粗糙度降低的主要原因。
Passive methods to increase the heat flux on the subcooled flow boiling are extremely needed on modern cooling systems. Many methods, including treated surfaces and extended surfaces, have been investigated. Experimental research to enhance the subcooled flow boiling using high sintered fiber attached to the surface was conducted. One bare surface (0 mm) and four porous thickness (0.2, 0.5, 1.0, 2.0 mm) were compared under three different mass fluxes (200, 400, and 600 kg center dot m(-2)center dot s(-1)) and three different inlet subcooling temperature (70, 50, 30). Deionized water under atmospheric pressure was used as the working fluid. The results confirmed that the porous body can enhance the heat flux and reduce the wall superheat temperature. However, higher porous thickness presented a reduction in the heat flux in comparison with the bare surface. Bubble formation and pattern flow were recorded using a high-speed camera. The bubble size and formation are generally smaller at higher inlet subcooling temperatures. The enhancement in the heat flux and the reduction on the wall superheat is attributed to the increment on the nucleation sites, the increment on the heating surface area, water supply ability through the porous body, and the vapor trap ability.