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首页> 外文期刊>Journal of Heat Transfer >Effective Thermal Conductivity of a Wet Porous Medium-Presence of Hysteresis When Modeling the Spatial Water Distribution for the Pendular Regime
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Effective Thermal Conductivity of a Wet Porous Medium-Presence of Hysteresis When Modeling the Spatial Water Distribution for the Pendular Regime

机译：湿态多孔介质存在时滞的有效热导率，当为垂体模型模拟空间水分布时

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This paper deals with the heat transfer between two spherical grains separated by a small gap; dry air is located around the grains and a liquid water meniscus is supposed to be present between them. This problem can be seen as a microscale cell of an assembly of solid grains, for which we are looking for the effective thermal conductivity. For a fixed contact angle and according to the volume of the liquid meniscus, two different shapes are possible for the meniscus, giving a "contacting" state (when the liquid makes a true bridge between the two spheres) and a "noncontacting" one (when the liquid is split in two different drops, separated by a thin air layer); the transition between these two states occurs at different times when increasing or decreasing the liquid volume, thus leading to a hysteresis behavior when computing the thermal flux across the domain.
机译：本文讨论了两个球形颗粒之间的热传递，它们之间有一个很小的间隙。干燥的空气位于谷物周围，并且应该在它们之间存在液态水弯月面。这个问题可以看作是固体颗粒组件的微型电池，我们正在寻找有效的导热性。对于固定的接触角并根据液体弯月面的体积，弯月面可能有两种不同的形状，从而呈现“接触”状态（当液体在两个球体之间形成真正的桥时）和“非接触”状态（当液体分成两个不同的液滴时，由薄薄的空气层隔开）；当增加或减少液体体积时，这两种状态之间的转换发生在不同的时间，因此在计算整个区域的热通量时会导致磁滞行为。

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