A hybrid Monte Carlo-discrete ordinates method for phonon transport in micro/nanosystems with rough interfaces

被引:8
作者
Ran, Xin [1 ]
Huang, Yunfan [1 ]
Wang, Moran [1 ]
机构
[1] Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Dept Engn Mech, Minist Educ, Beijing 100084, Peoples R China
关键词
Hybrid method; Monte Carlo method; Discrete ordinates method; Micro; nano-scale heat transport; Phonon transport; GAS KINETIC SCHEME; HEAT-CONDUCTION; THERMAL-CONDUCTIVITY; RADIATIVE-TRANSFER; DIRECT SIMULATION; MICROCHANNELS; DISPERSION; EQUATION;
D O I
10.1016/j.ijheatmasstransfer.2022.123624
中图分类号
O414.1 [热力学];
学科分类号
摘要
In recent years, the rapid development of micro/nanosystems raises the demand of thermal optimization of the new designs, and thus the accurate and efficient prediction of phonon transport in mesoscopic systems with complex interfaces is required. This work proposes a hybrid Monte Carlo-discrete ordinates method (MC-DOM) for steady-state phonon transport in such systems by developing an algorithm to exchange information between MC and DOM subdomains. Based on the phonon Boltzmann transport equation which is physically compatible with the system scale, our formulation exploits the computational efficiency of DOM in the bulk region with flexibility of MC near complex interfaces. The cross-plane phonon transport through the thin films is considered first as the benchmark for method verification, whose results agree well with those calculated by numerical and analytical solutions. It is noteworthy that compared to MC as a pure particle method, the hybrid method runs faster over a hundred of times for the temperature calculation when high-precision results are needed. The hybrid method is then applied to simulate the in-plane phonon transport through the double-layer thin films with rough interfaces. It is found that for rectangular interfaces with different roughness, the interfaces perpendicular to the heat flux will cause a larger thermal resistance than the parallel ones. Our hybrid method enriches numerical tools for mesoscopic phonon transport simulation, and is helpful to reveal the mechanisms behind and optimize the heat transport in micro/nanosystems with complex geometries.(c) 2022 Elsevier Ltd. All rights reserved.
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页数:14
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