Numerical Study of the Mixing of Density-Stratified Fluid with a Jet
Numerical Study of the Mixing of Density-Stratified Fluid with a Jet作者机构：Graduate School of Information Science Nagoya University Nagoya 464-8601 Japan Chubu Electric Power Co. Inc. Nagoya 461-8680 Japan Kawasaki Heavy Industries Ltd. Hyogo 650-8680 Japan EcoTopia Science Institute Nagoya University Nagoya 464-8603 Japan
出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)
年 卷 期：2014年第4卷第10期
页 面：789-798页
学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 08[工学] 0824[工学-船舶与海洋工程] 0836[工学-生物工程] 082401[工学-船舶与海洋结构物设计制造] 082203[工学-发酵工程] 0822[工学-轻工技术与工程] 083203[工学-农产品加工及贮藏工程]
主 题：Mixing density-stratified fluid jet CFD (computational fluid dynamics) internal density current.
摘 要：Density stratification of LNG （liquefied natural gas） is produced in a storage tank when one LNG is loaded on top of another LNG in the same tank. Mixing LNG by a jet issued from a nozzle on the tank wall is considered to a promising technique to prevent and eliminate stratification in LNG storage tanks. This study is concerned with the numerical simulation of a jet flow issued into a two-layer density-stratified fluid in a tank and the resultant mixing phenomena. The jet behavior was investigated with the laboratory-based experiment of the authors＇ previous study. A numerical method proposed by the authors is employed for the simulation. The upper and lower fluids are water and a NaCl-water solution, respectively, and the lower fluid is issued vertically upward from a nozzle on the bottom of the tank. The Reynolds number （Re） defined by the jet velocity and the nozzle diameter ranges from 95 to 2,378, and the mass concentration of the NaCl-water solution Co is set at 0.02 and 0.04. The simulation highlights the jet-induced mixing between the upper and lower fluids. It also clarifies the effects of Re and C0 on the height and horizontal spread of the jet.
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