| 分形颗粒在低Reynolds数条件下传热特性 | |
| 虞君武 ; 何榕 ; 张衍国 ; YU Junwu ; HE Rong ; ZHANG Yanguo | |
| 2016-03-30 ; 2016-03-30 | |
| 关键词 | 分形颗粒 分子运动论 分子扩散 传热系数 fractal particle kinetic theory molecular diffusion heat transfer coefficient TK124 |
| 其他题名 | Heat transfer characteristics of a fractal particle in a low Reynolds number flow |
| 中文摘要 | 目前可用的单个颗粒传热计算公式是在假设颗粒为球形颗粒的基础上得到的,但实际颗粒与球体差异很大,其外形很不规则。但在涉及颗粒流的实际工业计算和相关数值模拟计算中,研究者们通常将实际颗粒近似看成球体,而能否简单采用这一球形假设,还有待进一步验证。该文通过自由漫步的方法生成了与实际颗粒很相似的分形颗粒模型,并运用分子运动论和气体扩散理论建立了分形颗粒在低Reynolds数条件下传热计算模型,研究了分形颗粒的传热特性。计算使用的颗粒直径范围为小于5μm。计算结果表明:分形颗粒在低Reynolds数条件下进行传热计算时,采用球形假设会产生很大误差,最大误差可达82%;分形颗粒的比表面积和分形维数对Nu有重要影响。; Current heat transfer coefficient formulae for particles are derived from data for spheres.However,a real particle is not a sphere,but an irregular body,so the assumption that the real particle approximates a sphere is questionable in mathematical models.Fractal models,which give shapes similar to real particles,are produced by the random walk method to calculate the heat transfer coefficient of a factual particle in a low Reynolds number flow using kinetic theory and gas diffusion theory.The particle diameter is less than 5μm.Simulations show that the spherical assumption is not suitable for the fractal particle with a maximum error of 82%.Nuis then greatly influenced by the specific area and fractal dimension. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144956]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 虞君武,何榕,张衍国,等. 分形颗粒在低Reynolds数条件下传热特性[J],2016, 2016. |
| APA | 虞君武,何榕,张衍国,YU Junwu,HE Rong,&ZHANG Yanguo.(2016).分形颗粒在低Reynolds数条件下传热特性.. |
| MLA | 虞君武,et al."分形颗粒在低Reynolds数条件下传热特性".(2016). |
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