Microgravity Experiments on Phase Change of Self‐Rewetting Fluids
Microgravity Experiments on Phase Change of Self‐Rewetting Fluids
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DOI：
10.1196/annals.1324.022
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发表时间：
2003-09
影响因子：
5.2
通讯作者：
Y. Abe;A. Iwasaki;Kotaro Tanaka
中科院分区：
文献类型：
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作者：
Y. Abe;A. Iwasaki;Kotaro Tanaka
摘要：在日本微重力中心(JAMIC)的10秒落轴上进行了一系列关于自增湿流体的微重力实验。在所有实验中，使用1.5wt%的正丁醇水溶液作为自润湿液。第一个实验的目的是借助双波长干涉仪和示踪粒子观察二维相邻双汽泡的沸腾行为。在气泡相互作用和沿汽泡界面发展的流动方面，自增湿流体和正常流体(本实验中为CFC-113)之间存在显著差异。第二个实验重点研究了气泡/加热器接触区和三相界面周围的流动，并用示踪剂颗粒进行了可视化。在正丁醇水溶液、CFC-113和乙醇水溶液中观察到了不同的行为。最后一个微重力实验演示了无芯热管，其中包含三种不同的流体作为工质：正丁醇水溶液、水和乙醇水溶液。监测了热管内工质的温度变化，并用示踪粒子显示了从冷凝区返回到蒸发区的液体流动。除了微重力实验外，还在地面上评价了含正丁醇水溶液的常规热管的性能，并与水热管进行了比较。给出了我们的初步结果。
Abstract: A series of microgravity experiments on self‐rewetting fluids has been conducted at the 10‐second drop shaft of the Japan Microgravity Center (JAMIC). In all the experiments, 1.5 wt% of 1‐butanol aqueous solution were employed as a self‐rewetting fluid. The objective of the first experiment was to observe the boiling behavior of two‐dimensional adjacent dual vapor bubbles with the aid of a two‐wavelength interferometer and tracer particles. A significant difference was observed between a self‐rewetting fluid and a normal fluid (CFC‐113 in this experiment) in bubble interaction and flow developed along vapor/bubble interface. The second experiment focused on the flow at the bubble/heater contact area and around the three‐phase interline, visualized with tracer particles. Differing behavior among three fluids, 1‐butanol aqueous solution, CFC‐113, and ethanol aqueous solution, was observed. The last microgravity experiment was a demonstration of wickless heat pipes containing three different fluids as a working fluid, 1‐butanol aqueous solution, water, and ethanol aqueous solution. The temperature variation of working fluid in the heat pipe was monitored, and the liquid flow returning from the condensation region to the evaporation region was visualized by tracer particles. In addition to microgravity experiments, the performance of conventional heat pipes with 1‐butanol aqueous solution was evaluated on the ground, and compared with water heat pipes. Our preliminary results are presented.