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Optical Measurement of Solidification Ratio in Phase Change Slurry considering Refraction in Droplets

考虑液滴折射的相变浆料凝固率光学测量

基本信息

批准号：
17360088
负责人：
KUDO Kazuhiko
金额：
$ 7.87万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360088/
关键词：
phase change slurry measurement of solidification ratio transmittance reflectande Monte Carlo method palaphine droplet radiative transmittance in droplets

项目摘要

The objective of the present study is to develop an optical method to measure the solidification ratio of paraffin droplets suspended in phase change slurry. For the purpose, an analytical model was developed using the Monte Carlo method. The model calculates the transmittance and reflectance of the phase change slurry layer for laser beam with a wavelength of 670nm. The slurry contains paraffin particles with different diameters and different optical properties Experiments were also carried out to measure the transmittance and reflectance of the phase change slurry layer for laser beam with a wavelength of 670nm. The experiments were carried out for both solidified paraffin particles and liquid paraffin particles.From those study, following results are obtained;1. A model is developed to calculates the transmittance and reflectance of phase change slurry layer containing either solidified or liquefied paraffin droplets for laser beam with a wavelength of 670nm2. The results of the analytical model are confirmed by comparing the results with the analytical and experimental results of other researchers' studies.3. The cause of the increase in the reflectance and the decrease in the transmittance of the layer by the solidification of the paraffin particles in the layer is proved to be the formation of cavities on the droplet surfaces. And, the analytical results of the transmittance and the reflectance of the layer fit very well with the corresponding experimental results by using a solidified particle model with a dimple on the surface.By using the developed analytical model incorporating solid particle with a dimple on the surface, the estimation of solidification ratio of paraffin particles in phase change becomes possible by comparing the analytical results and the corresponding experimental ones.

本研究的目的是发展一种光学方法来测量悬浮在相变浆料中的石蜡液滴的固化率。为此，使用蒙特卡罗方法开发了一个分析模型。该模型计算了相变浆料层对波长为670 nm的激光的透射率和反射率。实验中还测量了相变浆料层对波长为670 nm的激光的透过率和反射率。本文对固体石蜡颗粒和液体石蜡颗粒进行了实验研究，得到了以下结果：1。建立了一个模型，计算了含固化和液化石蜡液滴的相变浆料层对波长为670 nm ~ 2的激光的透射率和反射率。通过与其他研究者的分析和实验结果的比较，验证了分析模型的正确性.结果表明，由于石蜡粒子在膜层中的固化，膜层的反射率增加，透射率降低，其原因是在液滴表面形成了空腔。采用表面有凹坑的固体颗粒模型，得到的透射率和反射率的解析结果与相应的实验结果吻合较好。通过分析结果与相应的实验结果的比较，实验性的。