Effect of Temperature-Dependent Thermo-Physical Properties on Micro-Scale Heat Transfer

• Main Authors: Cheng-Wei Chang, 張宸瑋
• Other Authors: Yung-Ming Lee
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/22103039201622437893

碩士 === 逢甲大學 === 航太與系統工程所 === 97 === This study investigates the micro-scale heat transfer behaviors of the thermal wave model (CV model) and the dual-phase-lag model (DPL model) inside a semi-infinite body or a finite slab. The effects of sudden heating on the boundary and heat source term on the thermal behaviors are also examined. The concepts of equilibrium entropy production and nonequilibrim entropy production are used to validate whether the temperature solution violates the second law of thermodynamics. After adding heat source term into the energy equation, there are a great increase in the values of temperature, heat flux, equilibrium entropy production and nonequilibrium entropy production respectively. When the boundary of a finite slab suffers a sudden heating, the temperature solution and equilibrium entropy production violate the second law of thermodynamics. Those solutions can be corrected by the Green’s function solution method. The thermal conductivity can be either a constant or a function of temperature in this study. If the thermal conductivity is a function of temperature, the non-linear transient energy equation is converted into linear one by using Kirchhoff''s transformation. The temperature can then be obtained from the reference variable which is correlated between nonlinear and linear equations. The effect of temperature-dependent thermal conductivity on temperature solution, heat flux, equilibrium entropy production and nonequilibrium entropy production is significant.