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Numerical Study on the Effects of contraction ratio in a Two-Phase Flow Injection Nozzle

Open Journal of Fluid Dynamics 2016年第1期6卷 1-10页

作者： Haider Ali Kyung Won Kim Jae Sik Kim Jong Yun Choi Cheol Woo Park School of Mechanical Engineering Kyungpook National University Daegu Korea Podomaul Co. Ltd. 1190 Kumchang-Ro Daechang-Myon Yeongcheon-Si Korea B.C.M. Co. Ltd. 81 Yeomsaekgongdancheon-Ro Seo-Gu Daegu Korea

The Euler-Euler numerical method was used to investigate the effects of contraction ratio on twophase flow mixing with mass transfer in the flow injection nozzle. The geometric shape of the nozzle was modified to improve carbonation efficiency. A gas inlet hole was created to increase the flow mixing of CO2 with water. A nozzle throat was also introduced to increase the gas dissolution by increasing flow rates. Various contraction ratios of nozzle throat, inlet gas and liquid velocities, and gas bubble sizes were employed to determine their effects on gas hold-up, gas concentration, and mass transfer coefficient. Results revealed that the flow injection nozzle with high contraction ratios improved carbonation because of high gas hold-up. Gas concentration was directly related to contraction ratio and gas flow velocities. Carbonation reduced when high liquid velocities and large gas bubbles were employed because of inefficient flow mixing. This study indicated that flow injection nozzle with large contraction ratios were suitable for carbonation because of their ability to increase gas hold-up, gas concentration, and mass transfer coefficient.

关键词： Flow Injection Nozzle Nozzle Throat contraction ratio Gas-Liquid Flow Mass Transfer

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Minimum wall pressure coefficient of orifice plate energy dissipater

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Water Science and Engineering 2015年第1期8卷 85-88页

作者： Wan-zheng Ai Jia-hong Wang School of Shipping and Ports Architecture Engineering Zhejiang Ocean University

Orifice plate energy dissipaters have been successfully used in large-scale hydropower projects due to their simple structure, convenient construction procedure, and high energy dissipation ratio. The minimum wall pressure coefficient of an orifice plate can indirectly reflect its cavitation characteristics： the lower the minimum wall pressure coefficient is, the better the ability of the orifice plate to resist cavitation damage is. Thus, it is important to study the minimum wall pressure coefficient of the orifice plate. In this study, this coefficient and related parameters, such as the contraction ratio, defined as the ratio of the orifice plate diameter to the flood-discharging tunnel diameter; the relative thickness, defined as the ratio of the orifice plate thickness to the tunnel diameter; and the Reynolds number of the flow through the orifice plate, were theoretically analyzed, and their relationships were obtained through physical model experiments. It can be concluded that the minimum wall pressure coefficient is mainly dominated by the contraction ratio and relative thickness. The lower the contraction ratio and relative thickness are, the larger the minimum wall pressure coefficient is. The effects of the Reynolds number on the minimum wall pressure coefficient can be neglected when it is larger than 10^5. An emoirical expression was presented to calculate the minimum wall oressure coefficient in this study.

关键词： Orifice plate Minimum wall pressure coefficient Cavitation contraction ratio Relative thickness Energy dissipater

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Hydraulic Characteristics of Multi-Stage Orifice Plate

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Journal of Shanghai Jiaotong university(Science) 2014年第3期19卷 361-366页

作者：艾万政周琦 School of Navigation Zhejiang Ocean University Zhongnan Engineering Corporation

Energy dissipater of multi-stage orifice plate, as a kind of effective energy dissipater with characteristics of high energy dissipation ratio and low cavitations risk, has become welcomed more and more by hydraulics researchers. The relationship between the contraction ratio of upper stage orifice plate and the lower one's under the principle of equal-cavitation characteristics, and the reasonable distance between upper stage orifice plate and the lower one under the condition of complying with this principle, are two important factors to be considered for multi-stage energy dissipater design. In the present paper, these two factors were analyzed by theoretical consideration and numerical simulations, and solving methods were put forward. The conclusion in this paper was proved to be reasonable by model experiment.

关键词： multi-stage orifice plate contraction ratio energy dissipater cavitation number equal-cavitation characteristics

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