کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
663081 1458156 2007 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of temperature and disorder on thermal boundary conductance at solid–solid interfaces: Nonequilibrium molecular dynamics simulations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Effects of temperature and disorder on thermal boundary conductance at solid–solid interfaces: Nonequilibrium molecular dynamics simulations
چکیده انگلیسی

Thermal transport across interfaces is becoming increasingly important with the advent of nanostructures and nanocomposite materials. A nonequilibrium molecular dynamics (NEMD) approach is developed to investigate thermal transport across solid–solid interfaces. Thermal boundary conductance is calculated for a range of mismatched interfaces and compared to the diffuse mismatch model (DMM). The interfacial conductance decreased with increasing mismatch, as expected. The DMM fits the NEMD results well for poorly matched interfaces at a temperature approximately half of the melting temperature of the material, but it underpredicts the conductance for highly matched interfaces. One of the key findings of this study is that there is a significant interfacial thermal transport dependence on temperature in the NEMD simulations, which is not accounted for by the mismatch models where only elastic scattering is considered. For large lattice mismatches that resulted in numerous defects at the interface, the thermal interfacial conductance dramatically decreased for interfaces with similar vibrational density of states. The presence of the defects had a minimal impact on the thermal transport for highly mismatched interfaces. Interface mixing improves thermal transport by nearly a factor of two for mixing depths of 20 atomic planes for highly mismatched interfaces.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 50, Issues 19–20, September 2007, Pages 3977–3989
نویسندگان
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