| 引用本文: | 王成安,马兰新.重力场下顺磁性介质内辐射与热磁对流的耦合[J].哈尔滨工业大学学报,2015,47(9):68.DOI:10.11918/j.issn.0367-6234.2015.09.013 |
| WANG Cheng’an,MA Lanxin.Coupled radiation and thermo-magnetic convection in participating paramagnetic medium under gravitational field[J].Journal of Harbin Institute of Technology,2015,47(9):68.DOI:10.11918/j.issn.0367-6234.2015.09.013 |
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| 摘要: |
| 为了分析高温环境下顺磁性介质流动的换热情况,采用数值方法研究重力环境下,二维封闭腔体内顺磁性半透明介质内热磁对流与辐射传输的耦合换热问题,腔体外施加非均匀梯度的磁场,对于顺磁性介质磁场力正比于磁化率和磁感应强度平方梯度的乘积,与重力共同作用于流体质点. 磁化率为热力学温度的函数并遵循Curie定律. 热磁对流发生在高温环境下,顺磁性流体为吸收发射性半透明灰介质. 通过研究不同磁场强度、光学厚度下,流场、温度场以及平均努赛尔数分布特点及规律,结果表明,磁场、热辐射均对流动换热存在明显的强化作用,但光学厚度增加则对腔体内流动换热存在一定的抑制作用. |
| 关键词: 顺磁性流体 热磁对流 辐射 耦合换热 重力场 数值模拟 |
| DOI：10.11918/j.issn.0367-6234.2015.09.013 |
| 分类号:TK124 |
| 基金项目:国家自然科学基金(51121004)；哈尔滨工业大学(威海)科研基金(HIT(WH)201302)；哈尔滨工业大学科研创新基金(HIT.NSRIF.2014132). |
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| Coupled radiation and thermo-magnetic convection in participating paramagnetic medium under gravitational field |
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WANG Cheng’an, MA Lanxin
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(School of Automobile Engineering, Harbin Institute of Technology at Weihai, 264209 Weihai, Shandong,China)
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| Abstract: |
| In order to study the fluid flow and heat transfer process of paramagnetic medium in the high temperature environment, in this paper, the radiation effect on the thermo-magnetic convection in participating paramagnetic medium under gravity condition is studied numerically. The external magnetic field with non-uniform magnetic gradient is imposed. For a paramagnetic fluid, the magnetic force is proportional to the product of magnetic susceptibility and the gradient of the square of the magnetic induction, and acts on fluid particles cooperatively with gravity. The magnetic susceptibility is related to absolute temperature according to Curie′s law. The thermo-magnetic convection is carried out in high temperature environment and the paramagnetic fluid is a semitransparent gray medium which absorbs and emits energy. In the present study, the distribution characteristics and the regularities of fluid flow, temperature field and average Nusselt number are investigated under different magnetic Rayleigh number and optical thickness. The research results show that the magnetic field and radiation could enhance the convection, but have suppression effect with the increasement of optical thickness. |
| Key words: paramagnetic fluid thermo-magnetic convection radiation coupled heat transfer gravitational field numerical simulation |
