Study of the effect of turbulent mixing on chemical reaction in liquid

湍流混合对液体化学反应影响的研究

• 批准号: 02402026
• 负责人: NAKAMURA Ikuo
• 金额: $ 20.54万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02402026/
• 关键词: Chemical Reaction; Turbulent Mixing; Coaxial Jets; Concentration; Multicomponent; Laser Velocimeter; Stochastic Model; Random Fourier Mode; レ-ザ流速計; ランダムフ-リエモ-ド法

In order to clarify the effect of turbulent mixing on the chemical reaction occurring in liquid, the researches were performed both experimentally and computationally. Chemical reaction, simple but suited to optical measurement and selected is the type; A + B * R,B + R * S (the azo coupling of 1-naphthol (A) with diazotised sulfanilic acid (B) in dilute, aqueous, alkaline buffered solution). The optical fiber probe with the core diameter of 10 mum has been anew developed to measure the instantaneous concentrations of chemical products (R and S) at a spatial point. The improved concentration measuring system of multiple species was also fitted up. As the fundamental research,the turbulent jet of species B into species A was investigated. At first, the mean velocity and velocity fluctuation rms profiles were measured using the fiber type of LDV system purchased. Next, various statistical properties of the concentration fields of chemical products R and S (the mean value, fluctuation rms … More value, correlation between R and S, pdf, etc.) were investigated in detail.As the research on the mixing process in the turbulent pipe flow, the diffusion field of single species from the continuous point source on the wall was measured. The turbulence in the pipe (Inner diameter D=100 mm, the length of the test section 2000 mm, Reynolds number Re=U<@D2m@>D2D/nu (] SY.simeq.[) 20000, U<@D2m@>D2: maximum mean velocity) was not fully developed but the radial profile of the mean velocity is almost self-similar in the downstream direction. By examining the contours of the iso-mean concentration and iso-concentration fluctuation rms values, the spread of the plume was also clarified.With regards to the numerical simulation, the diffusion of fluid particle around a circular cylinder was investigated by the combined model of random Fourier modes and random flight. The molecular mixing models of the passive scalar in turbulent flow were also examined by the PDF method. To compare these numerical results with experiments, the disturbance effect of a sphere on the plume developed in grid-turbulence was investigated experimentally. From the fractal analysis, it is elucidated that the flow distortion due to the sphere is not effective to the change of the fractal dimension. The mixing process of two species in the case of coaxial jet was also examined. Less

为了弄清湍流混合对液体化学反应的影响，从实验和计算两方面进行了研究。化学反应，简单，但适合于光学测量和选择的类型：A+B*R，B+R*S(1-萘酚(A)与重氮磺胺(B)在稀水碱性缓冲溶液中的偶氮偶合)。研制了芯径为10微米的光纤探头，用于在一个空间点上测量化工产品(R和S)的瞬时浓度。并对改进后的多组分浓度测量系统进行了装配。作为基础性研究，对B组分进入A组分的湍流射流进行了研究。首先，使用购买的光纤类型的LDV系统测量了平均速度和速度起伏的均方根分布。其次，化学产品R和S浓度场的各种统计特性(平均值，波动均方根…更多价值，R与S、pdf等之间的相关性)作为对湍流管流中混合过程的研究，测量了壁面上连续点源单组分的扩散场。管内的湍流(内径D=10 0 mm，试验段长度2 0 0 0 mm，雷诺数Re=U&lt；@D2m@&gt；D2d/nu()20000，U&lt；@D2m@&gt；D2：最大平均速度)没有完全发展，但平均速度的径向分布在下游方向几乎是自相似的。在数值模拟方面，采用随机傅立叶模式和随机飞行相结合的模型，研究了流体颗粒在圆柱体周围的扩散。用PDF方法研究了湍流中被动标量的分子混合模型。为了将数值计算结果与实验结果进行比较，实验研究了球体对网格湍流中羽流发展的扰动效应。从分维分析中可以看出，球体引起的流动变形对分维的变化没有影响。研究了两种物质在同轴射流情况下的混合过程。较少

项目成果

Yasuhiko SAKAI, Shengjian LIU, Hiroyuki TSUNODA & Ikuo NAKAMURA: "On the statistics of a Point-Source Plume around a Sphere" Trans.Japan Soc.Mech.Eng. Vol.58,No.541,B. 51-58 (1992)

酒井康彦、刘胜建、角田博之

酒井 康彦: "2粒子対確率過程モデルによる変動スカラー場の数値シミュレーション" 日本機械学会論文集(B編). 58. 3087-3093 (1992)

Yasuhiko Sakai：“使用双粒子对随机过程模型对波动标量场进行数值模拟”日本机械工程师学会会议录（编辑 B）58. 3087-3093 (1992)。

Yasuhiko SASAKI,Julian C.R.HUNT & Jimmy C.H.FUNG: "Diffusion of Fluid Particles by the Combined Model of Random Fourier Modes and Random Flight" JSME Int.Journal,Series II. Vol.35,No.4. 497-506 (1992)

佐佐木泰彦、朱利安·C·R·亨特

酒井 康彦: "ランダムフ-リエモ-ドとランダムフライトモデルの複合モデルによる流体粒子の拡散に関する研究" 日本機械学会論文集B編. 57. 1673-1980 (1991)

Yasuhiko Sakai：“使用随机自由模式和随机飞行模型的复合模型研究流体粒子的扩散”日本机械工程学会会刊，卷 B.57.1​​673-1980（1991）

Hiroyuki TSUNODA,Stephen B.POPE & Ikuo NAKAMURA: "On Molecular Mixing Model for PDF Equation of a Passive Scalar in Turbulent Flow" Proc.of the Chugoku-Shikoku Branch Conf.of Japan Soc.Mech.Eng. No.295-2. 70-72 (1992)

角田博之,Stephen B.POPE