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首页> 外文期刊>American journal of fluid dynamics >Effects of the Heater Location on the Unsteady Two Dimensional Natural Convection in Enclosures Bounded by Two Paraboloids of Revolution
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Effects of the Heater Location on the Unsteady Two Dimensional Natural Convection in Enclosures Bounded by Two Paraboloids of Revolution

机译：加热器位置对以两个抛物面为界的壳体中非定常二维自然对流的影响

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Using a paraboloidal coordinates system and a vorticity- stream function formulation, the authors study numerically the two-dimensional unsteady natural convection of a Newtonian fluid confined between two paraboloids of revolution with vertical axes. The upwardly open paraboloid is half heated and half insulated. The upper surface downwardly open is completely cooled. Two different cases, based on the position of the hot and the insulated region are considered. A finite volume method is used to approximate the dimensionless equations of vorticity, heat and stream function. A fully implicit scheme is adopted for time discretization and algebraic systems obtained are solved by a successive under relaxation method. The authors analyzed the effects of the Rayleigh number and the active zone location on the convective flow motion and heat transfer. For different Rayleigh numbers, and depending on the position of the active and inert zone, flows observed are very different.
机译：利用抛物面坐标系和涡流函数公式，作者对牛顿流体的二维非定常自然对流进行了数值研究，其被限制在两个垂直轴的抛物面之间。向上开口的抛物面被一半加热，一半被绝缘。向下开口的上表面已完全冷却。根据热区和绝缘区的位置，考虑了两种不同的情况。有限体积法用于近似涡旋，热和流函数的无量纲方程。对时间离散采用完全隐式方案，并通过逐次松弛法求解得到的代数系统。作者分析了瑞利数和活动区位置对对流流动和传热的影响。对于不同的瑞利数，并根据活性区和惰性区的位置，观察到的流量非常不同。

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