Heat transfer and interfacial temperature of two‐layered convection: Implications for the D″‐mantle coupling
Heat transfer and interfacial temperature of two‐layered convection: Implications for the D″‐mantle coupling
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DOI：
10.1029/2002gl015809
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发表时间：
2003-01
影响因子：
5.2
通讯作者：
A. Namiki;K. Kurita
中科院分区：
文献类型：
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作者：
A. Namiki;K. Kurita
我们对双层热对流的热通量和界面温度进行了实验室测量。实验表明，热通量的标度律（努塞尔数 - 瑞利数关系）可根据浮力数B进行分类。当B > 1时，热通量遵循众所周知的努塞尔数 - 瑞利数关系。然而，当B < 1时，界面会产生波动，并且热通量会系统性地增强。界面温度仅由上下层物理性质的比率决定。我们的研究结果表明，存在比上覆地幔粘性更小且密度略大的D″层会增强从地核到地幔的热传递。
We performed laboratory measurements of the heat flux and the interfacial temperature of two‐layered thermal convection. Experiments show that the scaling law of the heat flux (Nu‐Ra relation) can be classified by the buoyancy number B. The heat flux under B > 1 follows the well‐known Nu‐Ra relation. However, under B < 1, undulations develop at the interface, and heat flux is systematically enhanced. The interfacial temperature is determined only by the ratio of physical properties between the upper and lower layers. Our results suggest that the existence of less viscous and slightly denser D″ than the overlying mantle would enhance the heat transfer from the core to the mantle.