Research On Key Technologies Of Microscale Thermal Analysis

The size effect of micro-scale structures results in the heat and liquid behavior in devices going against classical heat transfer and hydromechanics, further more, because heat simulation softwares base classical theory of heat transfer, and the calculation of Molecular Dynamics method and Boltzmann transport theory in micro-scale heat transfer takes much time. Thus, the thermal analysis of micro-scale structures can not be accomplished directly using numerical simulation in engineering practical application. Due to this, the thesis puts forward the method of Correcting Viscosity Coefficient, which corrects the viscosity coefficient of macro scale in the case of micro scale, and then the thermal analysis of micro-scale structures can be done using commercial software. In the microchannel, considering wall boundary condition, the friction coefficients of the liquid and wall are reached respectively through integral calculation, then the viscosity coefficients of both are got, and in the end the average viscosity coefficients of the microchannel are gained. In this thesis, the theory and the mathematical model of classical heat transfer and micro-scale heat transfer are introduced, and the difficulty in the thermal analysis of micro-scale with classical heat transfer is studied, and the basis of theory is researched which is the base of the thermal analysis of micro-scale with the method of coefficient correcting. Then the friction coefficient and the viscosity coefficient are corrected, and the mathematical model is established. In the end, through the simulation of examples, the veracity of the method is validated.