Structure of High‐Performance Evaporators for Space Application
Structure of High‐Performance Evaporators for Space Application
复制标题
航天用高性能蒸发器的结构
DOI：
10.1196/annals.1362.015
复制
发表时间：
2006
影响因子：
5.2
通讯作者：
Y. Ishikawa
中科院分区：
文献类型：
--
作者：
H. Ohta;Y. Shinmoto;Toshiyuki Mizukoshi;Y. Ishikawa
翻译后摘要：一种新的结构的冷板，其中未加热的辅助通道被安装到供应液体直接到底部的合并扁平气泡在一个狭窄的加热通道，进行测试，调查临界热通量的增加。 假设应用于激光太阳能发电系统，采用了一个大的加热表面的长度为150 mm的流动方向，并采用窄通道结构，以减少冷板的尺寸，其中的差距大小被选为5 mm和2 mm。实验进行了水作为测试液体在入口过冷度为15 K，在近大气压下。对于地面上的向上流动，入口液体速度从0.065 m/s变化到0.6m/s。在0.2 m/s的入口速度下，对于5 mm的间隙尺寸，获得的临界热通量值为2.2 × 106 W/m2。在低液体流速下，该结构实现的CHF值比没有附加液体供应的正常加热通道的CHF值大2.5倍。提出了一种新的方法来评估冷板的性能，考虑到加热表面的大小，进口液体速度，和过冷度的影响CHF值的变化。所提出的结构的冷板的临界热通量的增加的有效性得到证实。
Abstract: A new structure of cold plates, where an unheated auxiliary channel is installed to supply liquid directly to the bottom of coalesced flattened bubbles in a narrow heated channel, is tested to investigate the increase in critical heat flux. Assuming the application to the laser solar power system, a large heating surface with a length of 150 mm in the flow direction is employed, and a narrow channel structure is adopted to reduce the size of cold plates, where the gap sizes are selected as 5 mm and 2 mm. Experiments are performed for water as a test liquid at inlet subcooling of 15 K under near atmospheric pressure. Inlet liquid velocity is varied from 0.065 m/s to 0.6m/s for the upward flow on ground. A value of critical heat flux of 2.2 × 106 W/m2 is obtained for 5‐mm gap size at the inlet velocity of 0.2 m/s. At low liquid flow rate, the structure realizes the CHF values larger by 2.5 times than those for the normal heated channel without additional liquid supply. A new method to evaluate the performance of cold plates is proposed to take account of the variation in the size of heating surface, inlet liquid velocity, and subcooling that influence the CHF values. The validity of the proposed structure of the cold plate for the increase in critical heat flux is confirmed.