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 3.65 μm, G decreases from 240 to 170 MW/m2K 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 micro/nanosystems more challenging.
Hotspot Size-Dependent Thermal Boundary Conductance in Nondiffusive Heat Conduction
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 5, 2014; final manuscript received March 18, 2015; published online April 16, 2015. Assoc. Editor: Robert D. Tzou.
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Ma, Y. (August 1, 2015). "Hotspot Size-Dependent Thermal Boundary Conductance in Nondiffusive Heat Conduction." ASME. J. Heat Transfer. August 2015; 137(8): 082401. https://doi.org/10.1115/1.4030170
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