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首页> 外文期刊>Journal of Heat Transfer >Hotspot Size-Dependent Thermal Boundary Conductance in Nondiffusive Heat Conduction
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Hotspot Size-Dependent Thermal Boundary Conductance in Nondiffusive Heat Conduction

机译:非扩散热传导中热点尺寸依赖的热边界电导

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Thermal transport across interfaces can play a critical role in nanosystems for thermal management and thermal energy conversion. Here, we show the dependence of the thermal boundary conductance (G) of the interface between a 70-nm Al transducer and a Si substrate on the size of a laser pump diameter (D) in the time-domain thermoreflectance (TDTR) experiments at room temperature. For D≥30 μm, G approaches to a constant where diffusion dominates the heat transfer processes. When D decreases from 30 μm to 3.65μm, G decreases from 240 to 170 MW/m~2K due to the increasing nonlocal effects from nondiffusive heat transport. This finding is vital to our understanding of the thermal boundary conductance: it depends not only on inherent interfacial conditions but also on external heating conditions, which makes the accurate measurements and theoretical predictions of thermal transport across interfaces in microanosystems more challenging.
机译:跨界面的热传输在纳米系统中对于热管理和热能转换起着至关重要的作用。在这里,我们在时域热反射(TDTR)实验中显示了70 nm Al换能器和Si衬底之间的界面的热边界电导(G)对激光泵直径(D)大小的依赖性。室内温度。对于D≥30μm,G接近一个常数,其中扩散主导传热过程。当D从30μm减小到3.65μm时,由于非扩散热传递增加的非局部效应,G从240减小到170 MW / m〜2K。这一发现对于我们对热边界电导的理解至关重要:它不仅取决于固有的界面条件,而且还取决于外部加热条件,这使得跨微/纳米系统中界面传热的精确测量和理论预测更具挑战性。

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