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Photonic Analyses of High Knudsen Number flows

高努森数流的光子分析

基本信息

批准号：
18360086
负责人：
NIIMI Tomohide
金额：
$ 10.28万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360086/
关键词：
High Knudsen Number Flows PSP TSP Linear Aerospike Nozzle Molecular Sensor Larwmuir-Blodgett Film Kinetic Theory REMPI Nonequilibrium リニア型エアロスパイクノズル

项目摘要

In analyses of high Knudsen number flow, such as low density flow regime and flow fields around or in micro-/nano-devices, it is essential to treat the fluid as a flow of atoms or molecules. In this research, high Knudsen number flows have been investigated experimentally using molecular sensors, numerically with the DSMC simulations and theoretically by the kinetic theory.Pressure Sensitive Paint (PSP), which is a diagnostic tool for pressure measurement using oxygen quenching of luminescence, was applied to the linear aerospike nozzle. The effectiveness of the sidewall was evaluated and the sidewall shape was optimized lb apply PSP to micro-/nano-flow fields, Pressure Sensitive Molecular Film (PSMF) has developed based on Langmuir-Blodgett technique. Many luminescent molecules were assessed to clarify the pressure sensitivity. Using the PSMF, pressure distributions of a micro channel and a micro nozzle were obtained. They showed good agreement with numerical results by the DSMC method.PSP is considered to show oxygen number flux rather than partial pressure from its mechanism. Therefore, the relation between oxygen number flux and partial pressure was investigated from the kinetic theory and the DSMC numerical simulation. In high Knudsen number regime, the luminescent intensity of PSP was appeared to show the pressure resulting from the impulse of oxygen molecules to the surface instead of oxygen gas pressure.The molecular beam is often used as a probe for gas-surface interaction. Resonantly Enhanced MultiPhoton Ionization (REMPI) method was applied to measure the rotational energy distribution of nitrogen molecular beam. The REMPI spectrum was successfully obtained, and. the rotational temperature deviated from the translational temperature. It was also suggested that the rotational distribution showed non-Boltzmann feature.

在分析高努森数流动，如低密度流态和微/纳米器件周围或内部的流场时，必须将流体视为原子或分子的流动。本研究采用分子传感器、DSMC数值模拟和动力学理论对高Knudsen数流动进行了实验研究，并将压敏涂料（PSP）应用于塞式喷管。为了将PSP应用于微纳流场，基于Langmuir-Blodgett技术研制了压敏分子膜（Pressure Sensitive Molecular Film，PSMF）。许多发光分子进行了评估，以澄清的压力敏感性。利用该方法得到了微通道和微喷嘴的压力分布。结果表明，PSP的计算结果与DSMC方法的计算结果吻合较好，从PSP的机理上可以认为PSP反映的是氧数通量而不是氧分压。因此，从动力学理论和DSMC数值模拟的角度研究了氧数通量与分压的关系。在高Knudsen数区，PSP的发光强度表现为氧分子冲击表面产生的压强，而不是氧气压强。采用共振增强多光子电离（REMPI）方法测量了氮分子束的转动能量分布。成功地获得了REMPI谱。旋转温度偏离平移温度。转动分布具有非Boltzmann特征。