Analysis of Thermophoretic Effect by Means of Phase Doppler Method
相位多普勒法分析热泳效应
基本信息
- 批准号:07405035
- 负责人:
- 金额:$ 15.04万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this study, establishment of measuring method and analysis of measured data concerning thermophoretic effect have been conducted to accumulate the qualitaive data and establish the adequate theory.(1) Establishment of measuring method of thermophoretic velocityThe measuring method of thermophoretic velocity, which is one of the characteristic values of thermophoresis, has been established. It was realized by setting up the measuring field, in which temperature distribution is linear and quasi steady, and gas flow velocity is negligible compared with thermophoretic velocity. The measuring field was a closed space in two flat plates (90x90mm), which were placed horizontally and parallel to each other in a narrow distance (1mm) with the upper plate heated to form a temperature gradient in between. The velocity of generated convective flow, which disturbs accurate measurements, was found to be proportional to the 3rd power of the plate distance and inverse of the width of plate. By this results, the accurate measurement in the temperature gradient of about 100 K/mm could be realized when the distance was set to be narrow (1mm).(2) Accumulation of qualitative data concerning thermophoretic effectBy means of the method denoted in (1), thermophoretic velocities have been measured to accumulate the qualitative data of thermophoretic effect. Thermophoretic velocities of SiO2 particles of 1-3mm in diameter and PMMA particles of 5-30mm in diameter have been measured under the temperature gradient of up to 90 K/mm, and well reproducible data were obtained. The measured data were found to be larger than the value proposed in previous studies. This result pointed out the uncertainty of the previous studies, in which data were measured in only small temperature gradient condition. Dependence of thermophoretic velocity on temperature gradient and particle diameter was also found to be different from that in the previous studies.
在本研究中,我们对有关热湿效应的测量方法的建立和测量数据进行了分析,积累了定性的数据,并建立了充分的理论基础。(1)热湿速度测量方法的建立建立了热湿效应的特征值之一--热湿速度的测量方法。它是通过设置测场来实现的,测场内的温度分布是线性的、准稳定的,与热泳速度相比,气流速度可以忽略不计。测量范围为两个平板(90×90 mm)的封闭空间,两个平板水平平行放置一小段距离(1 Mm),上平板受热形成温度梯度。实验发现,产生的对流速度与平板距离的3次方成正比,与平板的宽度成反比,从而影响了准确的测量。根据这一结果,在较窄的距离(1 Mm)下,可以实现100K/mm左右的温度梯度的精确测量。(2)有关热湿效应的定性数据的积累。在高达90K/mm的温度梯度下,测量了直径为1-3 mm的SiO_2颗粒和直径为5-30 mm的PMMA颗粒的热释速度,获得了重复性较好的数据。测量的数据被发现比以前研究中提出的值更大。这一结果指出了以往研究中仅在小温度梯度条件下测量数据的不确定性。热泳速度对温度梯度和颗粒直径的依赖关系也不同于以往的研究。
项目成果
期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Ritsu DOBASHI,Akira TODA,Yosuke OHI,and Toshisuke HIRANO: "Measurement of Particle Behavior in Thermophoresis" Nensho no Kagaku to Gijutu. Vol.5. 243-255 (1998)
Ritsu DOBASHI、Akira TODA、Yosuke OHI 和 Toshisuke HIRANO:“热泳中粒子行为的测量”Nensho no Kagaku to Gijutu。
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土橋律,大井洋介,戸田顕,平野敏右: "自然対流を制御した場における熱泳動速度の測定" 粉体工学会1997年度春期研究発表会(1997年5月開催). (発表予定).
Ritsu Tsuchihashi、Yosuke Oi、Akira Toda、Toshisuke Hirano:“受控自然对流场中热泳速度的测量”粉末工程学会 1997 年春季研究报告(1997 年 5 月举行)(计划报告)。
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土橋 律, 戸田 顕, 大井 洋介, 平野 敏右: "Thermophoresisによる粒子移動現象の計測" 燃焼の科学と技術. Vol.5. 243-255 (1998)
Ritsu Tsuchihashi、Akira Toda、Yosuke Oi、Toshisuke Hirano:“通过热泳测量粒子运动现象”《燃烧科学与技术》卷 5. 243-255 (1998)。
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- 影响因子:0
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Y.Ohi, A.Toda, R.Dobashi, and T.Hirano: "On Meusurements of Thermophoretic Effect in Normal Gravity" Transport Phenomena in Thermal-Fluids Engineering (Procooding of the 9thInt.Symp.of Transport Phenomena (ISTP-9)in Thermal-Fluids Eng.). Vol.1. 286-290 (1
Y.Ohi、A.Toda、R.Dobashi 和 T.Hirano:“论正常重力下热泳效应的测量”热流体工程中的输运现象(第 9 届输运现象国际会议 (ISTP-9) 的 Procooding)
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土橋 律.戸田 顕.大井 洋介.平野 敏右: "Thermophoresisによる粒子移動現象の計測" 燃焼の科学と技術. Vol.5. 243-255 (1998)
Ritsu Tsuchihashi、Akira Toda、Yosuke Oi 和 Toshisuke Hirano:“通过热泳测量粒子运动现象”,燃烧科学与技术,第 5 卷,243-255(1998 年)。
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HIRANO Toshisuke其他文献
HIRANO Toshisuke的其他文献
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