Investigation On The Computer Simulation Of Thermal Boundary Resistance At Low Temperature Based On Phonon Theory

In view of relating to the heat analyses calculation, design and making of the aerospace devices, the thermal boundary resistance becomes the key problem of thermal control technique in aerospace. The cryocooler directly cooled system has been widely applied in the high temperature superconducting techniques. As a result of the application of directly cooled techniques, the cooled mode of helium and solid is displaced another heat transfer mode, which mainly depended on the thermal conductance between one solid (superconducting device) and another solid (cold head of cryocooler). The changes of heat transfer mechanism resulted in that thermal boundary resistance and its optimization design have become a key techniques and science problem in directly cooled technology. In the fields of electronic technology, the heat transfer problem of electronic product includes heat transfer between integrated circuit and its submarine in chip as well as the design of heat removal on chip's crust. The performance and reliability of electronic product are greatly decided by their thermal boundary resistance.Based on the fruits of other research, it is described in this dissertation that the process of boundary heat transfer between solids at low temperature were investigated by use of the computer simulation method and techniques.About traditional simulation model research on thermal boundary resistance, based on traditional built-up model method, the simulation model of regression analyses on thermal boundary resistance between AlN ceramic and Bi-2223 was described in this dissertation according to their cryogenic experiment data. At the same time, the AlN and Bi-2223simulation model of least square method was discussed also.Based on Micro-Nan cryogenics and Microscale Transfer, the model of the ITR between AlN and Bi-2223 is built by using the Acoustic Mismatch Model, AMM and Diffuse Mismatch Model, DMM. Because there is a limit of roughness and temperature in AMM and DMM, the data of the theory model that is directly built by AMM and DMM is far from the experimental data. Accordingly, with DMM and traditionary methods, the mathematics model is posed by contrast and analyses of the experiment data. At last, the precision is improved greatly.