排序方式: 共有32条查询结果,搜索用时 31 毫秒
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在不同直径的垂直玻璃管中盛装着不同物性(粘度与表面张力)的液体,空气经分配器注入静止的液体中,对两相流型的变化进行了观察研究。流型的确定采用了高速录相机系统,也同时进行肉眼观察,并测量了不同流型的空隙度。实验表明:空气-高粘性液体和空气-起泡液体的气、液两相流型与通常的空气-水系统的流型极不相同。其空隙度也在较广泛范围内变化。 相似文献
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A very serious problem of instability that arises in the vertical thermosyphon reboilers can be solved by a newly developed equipment called internal thermosyphon reboiler. Experiments were carried out in both quartz tube and copper tube with the same geometrical dimensions. The former allowed better visual observation and the latter gave more quantitative informations. Water, sulfuric acid, triethanol-amine, heavy oil, ethanol-water, methanol-ethanol, ethanol-propanol and some other mixtures were used as working media. Particles of polypropene with density very close to water were used as the tracer in water system for investigating the flow characteristics. Rate of circulation, flow patterns, rate of heat transfer and fouling in this equipment were studied. A flow model and a design method were proposed. The results calculated could predict the characteristics of two-phase flow and heat transfer inside this boiling equipment. 相似文献
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以凸版印刷机、膜厚测试仪为基础,研究了PI液固含量、PI液补加滴数、印刷速度、Doctor轮压入量等几个因素对PI膜厚的影响,为实际生产中稳定控制PI膜厚提供了依据。 相似文献
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Drift velocity is a very important paramcter for predictirg the pool volumetric void fraction. Two-phase system of gas and high viscous liquids pool is encountered in various engineering applications. A review of the literature shows no data for explaining the effect of highly viscous liquids on the drift velocity. This paper's analysis shows that there is a considerable influence. It is shown that the foaming behaviour of liquids is dependent on the surface properties. For some highly viscous liquids at a given superficial gas velocity, the viscosity changes with time. The effect of "foam" and "time" on drift velocity is clearly elucidated. 相似文献
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立式热虹吸再沸器内的流动不稳定性是一个严重问题.本文作者最近研制的内热虹吸再沸器能够解决上述问题.采用相同几何尺寸的石英管及铜管进行实验,前者有利于观察研究,后者则能提供更多的定量结果.工作介质为水、硫酸、三乙醇胺 重油、乙醇-水、甲醇-乙醇、乙醇-丙醇及其他一些混合物.在观察水在管内的流动特性试验中,用聚丙烯颗粒作为示踪粒子,其密度与水非常相近.研究的内容包括循环速率、流型、传热速率及结垢等问题.提出了一个流动模型及设计方法.计算结果可用来推算此沸腾设备内的两相流及传热特性. 相似文献
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针对全氢罩式炉尾气对外直排的现状,对回收全氢罩式炉尾气中的氢气再利用安全性、可靠性、经济效益及环保效益进行了研究与阐述。 相似文献
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