An experimental study on the cavitation of water with dissolved gases
An experimental study on the cavitation of water with dissolved gases
复制标题
溶解气体水空化的实验研究
DOI：
10.1007/s00348-017-2449-0
复制
发表时间：
2017-12-01
影响因子：
2.4
通讯作者：
Chen, Min
中科院分区：
文献类型：
--
作者：
Li, Buxuan;Gu, Youwei;Chen, Min
空化起始通常由液体的拉伸强度决定。水的抗拉强度在许多领域都是必不可少的，对水的抗拉强度的研究将有助于理解空化的促进/预防及其在水中的相关应用。然而，以前的实验研究对水的抗拉强度值的结论各不相同;这种差异通常归因于水中杂质的存在。溶解气体，尤其是空气中的氧气和氮气，是水中最常见的杂质之一。这些气体对水的抗拉强度的影响尚不清楚。通过实验研究了溶解气体对水空化的影响。水中空化是用声学方法产生的。用不同浓度的溶解氧和氮气制备水样。结果表明，在相同温度下，与超纯水相比，溶氧水和溶氮水的抗拉强度随气体浓度的增加而降低。在相同的气体浓度和温度下，溶氧水的抗拉强度低于溶氮水。本文还讨论了产生这些结果的可能原因。
Cavitation inception is generally determined by the tensile strengths of liquids. Investigations on the tensile strength of water, which is essential in many fields, will help understand the promotion/prevention of cavitation and related applications in water. Previous experimental studies, however, vary in their conclusions about the value of tensile strength of water; the difference is commonly attributed to the existence of impurities in water. Dissolved gases, especially oxygen and nitrogen from the air, are one of the most common kinds of impurities in water. The influence of these gases on the tensile strength of water is still unclear. This study investigated the effects of dissolved gases on water cavitation through experiments. Cavitation in water is generated by acoustic method. Water samples are prepared with dissolved oxygen and nitrogen in different gas concentrations. Results show that under the same temperature, the tensile strength of water with dissolved oxygen or nitrogen decreases with increased gas concentration compared with that of ultrapure water. Under the same gas concentration and temperature, water with dissolved oxygen shows a lower tensile strength than that with dissolved nitrogen. Possible reasons of these results are also discussed.