| 普朗特数对槽内热磁耦合流动换热影响 |
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| 引用本文： | 张晓晖,刘大为,魏琪.普朗特数对槽内热磁耦合流动换热影响[J].工程热物理学报,2009,30(12). |
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| 作者姓名： | 张晓晖 刘大为 魏琪 |
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| 作者单位： | 苏州大学物理科学与技术学院,江苏,苏州,215006 |
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| 基金项目： | 江苏省博士后科研资助计划，国家自然科学基金 |
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| 摘 要： | 针对矩形槽内导电流体普朗特数分别为 0.01、1、100 时,进行了流动形态和换热的数值模拟研究.数值结果表明:普朗特数对流动、温度分布影响不同,从而影响到对流换热的强弱,低普朗特数流体热浮升力作用大,流动以热驱动为主,换热强度弱,发现在低普朗特数下,数值模拟得出的努赛尔数并不能收敛到某一定值,而是在一个区间范围内"来回振荡";高普朗特数流体,电磁力作用大,流动以电磁力驱动对流作用,换热随着哈特曼数的增加而得到很大提高.
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| 关 键 词： | 普朗特数 对流换热 数值模拟 |
EFFECT OF PRANDTAL NUMBER ON COMBINED THERMALLY AND ELECTROMAGNETICALLY DRIVEN CONVECTION HEAT TRANSFER IN A CAVITY |
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| ZHANG Xiao-Hui,LIU Da-Wei,WEI Qi.EFFECT OF PRANDTAL NUMBER ON COMBINED THERMALLY AND ELECTROMAGNETICALLY DRIVEN CONVECTION HEAT TRANSFER IN A CAVITY[J].Journal of Engineering Thermophysics,2009,30(12). |
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| Authors: | ZHANG Xiao-Hui LIU Da-Wei WEI Qi |
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| Institution: | ZHANG Xiao-Hui LIU Da-Wei WEI Qi (School of Physics Science and Technology,Soochow University,Suzhou 215006,China) |
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| Abstract: | Following previous studies of rectangular cavity enclosures of aspect ratio 2,direct numerical two-dimensional simulations are conducted for the combined thermally and electromagnetically driven convection flow in three Prandtl number fluids of 0.01,1 and 100.It is found that possible physically realizable flows evolve,from a steady symmetric 2-cell flow at a lower-Prandtl number, while thermally driven flow prevails,to 4-cell flow at a high-Prandtl number,where the fluid is governed by Lorentz force.For hi... |
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| Keywords: | Prandtl number convection heat transfer numerical simulation |
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