Convective Transport through Porous Layers

IF 0.4 Q4 ENGINEERING, MECHANICAL
E. Holzbecher
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引用次数: 0

Abstract

Convective motions are a multi-physics phenomenon, in which flow and transport processes interact in a two-way coupling. The density of the fluid depends on the value of transport variable and this back-coupling leads to non-linear behaviour. For the classical constellation of a closed fluid container heated from below convective motions appear, when a critical threshold for the Rayleigh number is exceeded. The heat transfer due to convection is much higher than in the case of pure conduction. Here systems of three layers are examined in detail. Using numerical CFD modelling it is shown that in layered systems different convective flow patterns appear than in the single layer case. The number and constellation of convection cells characterize steady flow patterns. Using a parametric sweep over the relevant parameter range of layer Rayleigh numbers and layer thicknesses we determine diagrams that show the excess heat or mass transfer of the dominant convection patterns, measured by the Nusselt- or Sherwood numbers.
通过多孔层的对流传输
对流运动是一种多物理场现象,其中流动和输运过程以双向耦合的方式相互作用。流体的密度取决于输运变量的值,这种反向耦合导致非线性行为。对于从下方加热的封闭流体容器的经典星座,当超过瑞利数的临界阈值时,就会出现对流运动。由对流引起的热传递比纯传导的情况下要高得多。这里详细地考察了三层体系。数值模拟表明,在分层系统中,对流流型与单层系统不同。对流细胞的数量和星座是稳定流动模式的特征。通过对层瑞利数和层厚度的相关参数范围进行参数扫描,我们确定了显示主要对流模式的多余热量或传质的图表,由努塞尔数或舍伍德数测量。
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来源期刊
International Journal of Multiphysics
International Journal of Multiphysics ENGINEERING, MECHANICAL-
CiteScore
1.20
自引率
57.10%
发文量
21
审稿时长
15 weeks
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