Effect of material arrangement pattern on different-mode-interacting boiling in narrow gaps with two liquid supply systems
Effect of material arrangement pattern on different-mode-interacting boiling in narrow gaps with two liquid supply systems
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DOI：
10.1016/j.applthermaleng.2021.116893
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发表时间：
2021-03
影响因子：
6.4
通讯作者：
Tianxiao Xie;Y. Utaka;Zhihao Chen;Toshiki Hirotani;S. Mori
中科院分区：
文献类型：
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作者：
Tianxiao Xie;Y. Utaka;Zhihao Chen;Toshiki Hirotani;S. Mori
以前的研究已经证明，不同模式的相互作用沸腾可以改善水池狭窄缝隙内的临界热流密度(CHF)。该方法利用非均匀导电板上不同沸腾方式的相互作用，使两种热不同材料边界附近的汽液不规则运动，扩大了润湿区的面积，延缓了CHF的发生。本研究在保持该方法特点的基础上，进一步改进了该方法的传热特性。为了增加不同材料边界的密度，采用了一种具有十字型几何形状的低电导材料的新排列方式。在水平排列的20 mm正方形铜表面上，与平行排列和常规形式的性能进行了比较。此外，以间隙大小和材料间距为参数，考察了两侧和4侧窄间隙对周围液体开放形式下的性能。CHF的显著增强是在交叉类型的安排中实现的。最大CHF分别为1140kW/m2和946kW/m2，分别提高了83%和75%。
Different-mode-interacting boiling has been proven to improve the critical heat flux (CHF) inside narrow gaps in a water pool in previous studies. This method expands the area of the wetted region and delays the occurrence of CHF with the irregular movement of the vapor and liquid near the boundary between two thermally different materials with interaction of different boiling modes on the non-uniform conductance plate. In the present study, while retaining the characteristics of this method, further improvement of heat transfer characteristics was investigated. To increase the density of different material boundaries, a new arrangement of low-conductance material with cross-type geometry was adopted. The performance on a horizontally arranged 20 mm square copper surface was compared with those of parallel arrangement and the conventional form. Furthermore, performance under the open forms of narrow gaps to surrounding liquid of 2 sides and 4 sides were examined with gap size and material pitch as parameters. Significant enhancements in CHF are achieved in cross-type arrangements. The maximum CHF of 1140 kW/m2and 946 kW/m2with large increases of 83% and 75% were achieved for 4-sides-open and 2-sides-open systems, respectively.