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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Magneto-thermal-convection stability in an inclined cylindrical annulus filled with a molten metal
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Magneto-thermal-convection stability in an inclined cylindrical annulus filled with a molten metal

机译：倾斜圆柱环中的磁热对流稳定性，填充有熔融金属

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Purpose - Metal-cooled reactors generally use molten metals such as sodium, potassium or a combination of sodium and potassium because of their excellent heat transfer properties so that the reactor can operate at much lower pressures and higher temperatures. The purpose of this paper is to investigate the stability of natural convection in an inclined ring filled with molten potassium under the influence of a radial magnetism. Design/methodology/approach - A numerical simulation of electrically conductive fluid natural convection stability is performed on an inclined cylindrical annulus under the influence of a radial magnetism. The upper and lower walls are adiabatic, while the internal and external cylinders are kept at even temperatures. The equations governing this fluid system are solved numerically using finite volume method. The SIMPLER algorithm is used for pressure-speed coupling in the momentum equation. Findings - Numerical results for various effective parameters that solve the problem in the initial oscillatory state are discussed in terms of isobars, isotherms and flow lines in the annulus for a wide range of Hartmann numbers (0 ≤ Ha ≤ 80), inclination angles (0 ≤ γ ≤ 90°) and radii ratios λ ≤ 6. The dependency stability diagrams between complicated situations with the critical value of the Rayleigh number RaCr and the corresponding frequency FrCr are established on the basis of the numeric data of this investigation. The angle of inclination and the radii ratio of the annulus have a significant effect on the stabilization of the magneto-convective flux and show that the best stabilization of the natural oscillatory convection is obtained by the intensity of the strongest magnetic field, the high radii ratio and inclination of the annulus at y = 30°. Practical implications - This numerical model is selected for its various applications in technology and industry. Originality/value - To the best of the authors' knowledge, the influence of the inclination of the cylindrical annulus (ring), with various radii ratio, on natural oscillatory convection under a radial magnetism has never been investigated.
机译：目的 - 金属冷却反应器通常使用熔融金属，例如钠，钾或钠和钾的组合，因为它们优异的传热性能，使得反应器可以在更低的压力和更高的温度下操作。本文的目的是研究在径向磁性的影响下填充有熔融钾的倾斜环中自然对流的稳定性。设计/方法/方法 - 导电流体自然对流稳定性的数值模拟在径向磁的影响下对倾斜的圆柱环进行。上壁和下壁是绝热的，而内部和外部气缸保持在均匀温度。用有限体积法在数值上求解控制该流体系统的方程。更简单的算法用于动量方程中的压力耦合。发现 - 在初始振荡状态下解决问题的各种有效参数的数值结果是在环形的宽范围的环空间中的索引，等温线和流线（0≤HA≤80），倾斜角度（0 ≤γ≤90°）和半径比λ≤6。基于本研究的数字数据建立具有瑞利数RACR的临界值和相应频率FRCR的复杂情况之间的依赖性稳定性图。倾斜角度和环状的半径比对磁性对流通量的稳定性有显着影响，并且表明通过最强磁场的强度，高度半径比率获得了天然振荡对流的最佳稳定性并在Y = 30°处的环形倾斜。实际意义 - 选择该数值模型为其各种技术和行业应用。原始性/值 - 据作者所知，从未研究过的圆柱形环（环）具有各种半径比的倾斜度，以径向磁力下的自然振荡对流的影响。

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