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Study on the Microscale Thermal Transfer Characteristic of the Composite Material Based on Lattice Boltzmann Method

Author: FengLeiLei
Tutor: GaoYuanWen
School: Lanzhou University
Course: Solid Mechanics
Keywords: Microscale heat transfer Lattice Boltzmann Method Effective Thermal Conductivity The thermal contact resistance Size effect
CLC: O551.3
Type: Master's thesis
Year: 2009
Downloads: 211
Quote: 0
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Abstract


The past 20 years , with the rapid development of semiconductor technology and micro / nano electromechanical systems ( Micro Electromechanical Systems ) technology , micro / nano devices and force structure - thermal - magnetic - electric coupling behavior to get people's attention . A large number of experiments show that when the system scale miniaturization , different heat transfer law and conventional scale . The so-called scale effect . Thermal issues become one of the key factors of the impact of micro / nano devices and structural performance . This article is based on the Boltzmann ( Boltzmann ) transport theory and the lattice Boltzmann method the calculation of heat conduction problems lattice Boltzmann method for incompressible two - dimensional nine-speed thermal models and boundary conditions of constant temperature , insulation , thermal resistance approach . On this basis, of the circular, elliptical , rectangular 1-3 composites of the heat transfer characteristics and the equivalent thermal conductivity and so on . Heat conduction problem in the mixed material magnetic field transverse harmonic eddy current heat conduction and conductor internal electric field . Consider the contact thermal resistance of the case of circular , rectangular inclusions 1-3 composites heat transfer characteristics and the equivalent thermal conductivity , etc., are given to the timing carve characteristics of temperature distribution on the structure , as well as the type of group points than different reflection coefficient delta on the effective thermal conductivity . Simulated inclusion in the micro-and nano -scale composites of the heat transfer characteristics and the thermal conductivity and the structure, size and reflection coefficient 6 changes the relationship between temperature and structure , distribution characteristics . Studies have shown that the heat transfer of nano-structured materials , the lattice Boltzmann method is an effective numerical methods for micro-and nano -scale heat transfer problems . The size effect and the thermal contact resistance is an important factor affecting the effective thermal conductivity .

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CLC: > Mathematical sciences and chemical > Physics > Thermal and material kinetic theory > Thermal > Thermal properties of matter
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