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| 纳米颗粒悬浮液热物性及颗粒比热容尺寸效应 | |
| 引用本文： | 王补宣,周乐平,彭晓峰. 纳米颗粒悬浮液热物性及颗粒比热容尺寸效应[J]. 工程热物理学报, 2004, 25(2): 296-298 |
| 作者姓名： | 王补宣 周乐平 彭晓峰 |
| 作者单位： | 清华大学热能系工程热物理所,北京,100084;清华大学热能系工程热物理所,北京,100084;清华大学热能系工程热物理所,北京,100084 |
| 基金项目： | 自然科学基金资助项目(No.59995550—3) |
| 摘 要： | 运用有效介质近似与分形理论描述纳米颗粒团聚体空间分布,同时考虑颗粒尺寸效应及表面吸附作用,建立起 纳米颗粒悬浮液有效导热系数预示模型,结果与实测数据相符。从弹性介质假设出发,简化声子色散关系并考虑表面软化 作用,建立起纳米颗粒比热容理论模型,提出尺寸效应参数,结果与实验数据符合较好。 |
| 关 键 词： | 导热系数 比热容 纳米颗粒 尺寸效应 |
| 文章编号： | 0253-231X(2004)02-0296-03 |
| 修稿时间： | 2003-12-09 |
THERMOPHYSICAL PROPERTIES OF NANOPARTICLE SUSPENSIONS AND SIZE EFFECT ON SPECIFIC HEAT CAPACITY OF NANOPARTICLE |
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| WANG Bu-Xuan ZHOU Le-Ping PENG Xiao-Feng. THERMOPHYSICAL PROPERTIES OF NANOPARTICLE SUSPENSIONS AND SIZE EFFECT ON SPECIFIC HEAT CAPACITY OF NANOPARTICLE[J]. Journal of Engineering Thermophysics, 2004, 25(2): 296-298 | |
| Authors: | WANG Bu-Xuan ZHOU Le-Ping PENG Xiao-Feng |
| Abstract: | Based on effective medium approximation and fractal theory for describing nanoparticle clusters, a model for predicting effective thermal conductivity of "nanofluid" is established considering particle size effect and particle surface adsorption. The proposed model predicts well with our measured data (Fig. 1). Extended the elastic continuum model for fine particles, we also proposed a method for calculating specific heat with simplified dispersion relation that consider phonon softening effect (Fig. 2), and suggested a new variable for characterizing particle size effect (Fig. 3). |
| Keywords: | thermal conductivity specific heat nanoparticle size effect |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |