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封闭圆内开缝圆自然对流换热的振荡特性 预览 被引量:3

OSCILLATION OF NATURAL CONVECTION IN A CYLINDRICAL ENCLOSURE WITH AN INTERNAL CONCENTRIC SLOTTED CYLINDER
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摘要 本文通过数值计算探讨了封闭圆内开缝圆自然对流换热的振荡特性。数值计算以整个圆为计算区域,采用了非稳态的数学模型和具有QUICK差分格式的SIMPLE算法。在相同条件下计算结果和实验结果符合很好。数值结果显示,当几何结构一定时,Rayleigh数Ra小于某个临界值时,流动和换热处于稳态,并且关于垂直中心线对称;Ra大于这个临界值时,流动和换热是振荡的,非对称的。数值实验还表明,流动和换热出现振荡时的临界Rayleigh数Rnc与开缝圆的开缝度有关,且流动和换热的振荡会出现对称振荡和非对称振荡两种情形。 The oscillation phenomena of natural convection in a cylindrical enclosure with an internal concentric slotted cylinder are investigated by numerical computations using SIMPLE algorithm with QUICK scheme. The whole enclosure is taken as the solution domain and an unsteady mathematical model is adopted for the numerical computations. The numerical results of average dimensionless equivalent conduction coefficient Keq obtained in this paper agree well with previous experimental results. It can be found that oscillatory natural convections can be obtained when Rayleigh number is over a critical value for a certain geometric configuration. The flow and heat transfer are steady and symmetrical about the vertical line when Rayleigh number is less than the critical value, and are unsteady and unsymmetrical when Rayleigh number is greater than the critical value. It is also found that the critical Rayleigh number Rac changes with slot widths, and there exists symmetrical and unsymmetrical oscillation for the oscillatory flow and heat transfer.
作者 黄夫泉 杨茉 余敏 单彦广 章立新 HUANG Fu-Quan, YANG Mo, YU Min, SHAN Yan-Guang, ZHANG Li-Xin (College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
出处 《工程热物理学报》 EI CAS CSCD 北大核心 2006年第2期 286-288,共3页 Journal of Engineering Thermophysics
基金 国家自然科学基金项目资助(No.50276037) 上海市教委发展基金项目资助(No.03GK08)
关键词 数值计算 自然对流 振荡 numerical computation natural convection oscillation
作者简介 黄夫泉(1982-),男,山东,硕士研究生,主要从事对流换热数值技术方面研究。
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参考文献7

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二级参考文献4

共引文献6

同被引文献19

  • 1杨沫,陶文铨,杨金顺,金虹,杨善让,徐志明,.圆内开缝圆环自然对流换热数值解的唯一性[J].工程热物理学报,1995,16(1):91-95. 被引量:6
  • 2杨沫 王立秋 等.圆内开缝圆环非定常自然对流换热的数值计算[J].哈尔滨工业大学学报,1999,31:59-62. 被引量:3
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  • 6YANG Mo, TAO Wenquan. A Numerical Study of Natural Convection Heat Transfer in a Cylindrical Enclosure With Internal Concentric Slotted Hollow Cylinder [J]. Numet Heat Transfer, 1992, 22:289-306. 被引量:1
  • 7Kuleek P V. Heating and cooling of bus bars for large power generators[J]. Electric Power Plant, 1964(10) .. 39 - 43. 被引量:1
  • 8Yang M, Tao W Q. A numerical study of nature convective heat transfer in an cylindrical enclosure with internal concentric slotted hollow cylinder[J]. Numerical Heat Transfer, 1992,22 (3) .. 289 - 306. 被引量:1
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  • 10Zhang K,Yang M, Zhang Y W. Numerical analysis ofnatural convection in a cylindrical envelope with an internal concentric cylinder with slots I-J]. Numerical Heat Transfer Part A, 2011,59(10) .. 739 - 754. 被引量:1

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