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（例如低密度流态和微/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流。在这项研究中，使用分子传感器对高努森数流进行了实验研究，通过 DSMC 模拟进行数值模拟，并通过动力学理论进行理论研究。压敏涂料 (PSP) 是一种利用氧猝灭发光进行压力测量的诊断工具。应用于线性气动塞式喷嘴。评估了侧壁的有效性并优化了侧壁形状，将PSP应用于微/纳米流场，基于Langmuir-Blodgett技术开发了压敏分子膜（PSMF）。对许多发光分子进行了评估以阐明压力敏感性。使用PSMF，获得了微通道和微喷嘴的压力分布。它们与DSMC方法的数值结果表现出良好的一致性。从其机理来看，PSP被认为显示的是氧数通量而不是分压。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之间的关系。在高克努森数范围内，PSP的发光强度似乎显示了氧分子冲向表面所产生的压力，而不是氧气压力。分子束通常用作气体-表面相互作用的探针。采用共振增强多光子电离（REMPI）方法测量氮分子束的旋转能量分布。成功获得REMPI谱图，并且。旋转温度偏离平移温度。也有人认为旋转分布表现出非玻尔兹曼特征。