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首页> 外文会议>Fourth International Conference on Advanced Computational Methods in Heat Transfer held in Udine, Italy, in July 1996 >Unsteady natural convective flow in an enclosure wit a periodically varying side wall heat flux
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Unsteady natural convective flow in an enclosure wit a periodically varying side wall heat flux

机译：具有周期性变化的侧壁热通量的封闭空间中的自然对流不稳定

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摘要

Unsteady natural convective flow in a square enclosure with one vertical wall hated, with the opposite wall coooled to a uniforem lower temperature and with the remaining walls adiabatic has been numerically studied. The heat flux of the heated wall is spatially uniforem but varying sinusoidally with time. The flow has been assumed to be varying sinusoidally with time. The flow has been assumed to be laminar and two-dimensional. he governing equations, expressed in terms of stream functionand vorticity and written in dimensionless form, have been solved using the finite-element method. The solvtion has as parameters the heat flux Rayleigh number based on the enclosure width, the Prandtl number and the frequency and magnitude of the idmensionless heat flux variation. Results have been obtained for a Prandtl number of 0.7 for Rayleigh numbers between 100 and 1,000,000. These results have been used to study the effects of the governing parameters on the mean hot wall temperature variation.
机译：在数值模拟中，对方形外壳中的非稳态自然对流进行了数值研究。受热壁的热通量在空间上是单一的，但随时间呈正弦变化。假定流量随时间呈正弦变化。假定流动是层流和二维的。用有限元方法求解了用流函数和涡度表示并以无量纲形式表示的控制方程。该解决方案具有基于外壳宽度，普朗特数以及无量纲热通量变化的频率和幅度的热通量瑞利数作为参数。对于100到1,000,000之间的瑞利数，已获得0.7的Prandtl数的结果。这些结果已用于研究控制参数对平均热壁温度变化的影响。

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