Numerical Study on the Effects of Contraction Ratio in a Two-Phase Flow Injection Nozzle
Numerical Study on the Effects of Contraction Ratio in a Two-Phase Flow Injection Nozzle作者机构：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
出 版 物：《Open Journal of Fluid Dynamics》 (流体动力学（英文）)
年 卷 期：2016年第6卷第1期
页 面：1-10页
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
主 题：Flow Injection Nozzle Nozzle Throat Contraction Ratio Gas-Liquid Flow Mass Transfer
摘 要：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.
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