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Study on the Coupling Themal-Optical Properties in Semitransparent Particle Wiht Phase Change

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Tutor: HeZhiHong
School: Harbin Institute of Technology
Course: Energy and Power Engineering
Keywords: semitransparent particles,meshless SPH,phase change,radiation-conduction couplin
CLC: TK124
Type: Master's thesis
Year:  2010
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Abstract:
It is a complex multi-field coupled heat transfer process for semitransparent particle with phase change, there often accompanied by absorption and emission of radiation and swell distortion and shrinkage splinter of mechanical behavior of fracture. Which is very important to process control and optimization design in related to the field with understand and master these mechanisms and behaviors, such as thermal spraying, droplet combustion, droplet cooling space technology, reactor accidents, solar thermal, etc. The radiation and conduction coupling simulation of particle in the high-temperature is necessary for accurate analysis the process of the phase change. Because there exists the phase interface movement and deformation problem in the process of phase change, the traditional gird method need to build a new gird repeating, this work is complex and fasting time. But meshless method does not depend on gird, so it’s a great advantage for solving complex problems such as continuous field changes.The purpose of this paper is to solving the radiation-conduction problems with the meshless SPH in the process of the phase change, we can not consider the mechanical behavior of fracture in this work. And suppose it is not phase change in the process of deformation. Thesis include:(1) The study on the conduction heat transfer problem in the process of phase change by meshless SPH method We build the conduction function with phase change and derived the SPH method discrete format of the boundary conditions, then create a computer program. Calculate the temperature field and interface position of the two-dimensional steady-state conduction heat transfer in the phase change with the fist and third boundary conditions. Compared with the analysis to study the accuracy and adaptability of the meshless SPH method by applied which to phase change.(2) The study on the radiation heat transfer with meshless SPH method We build the radiation transfer function without scattering media and derive the discrete format SPH method of the boundary conditions, then create the computer program. Calculate the radiation heat transfer of the absorption media of the two-dimensional square cavity. Compared with the finite volume solutions of the standard procedures, to investigate the meshless SPH method is used to dealing with the radiation problem.(3) Study on the heat transfer of coupled radiation and conduction in the process of phase change with the meshless SPH method We derive the discrete format of the power conduction of the process of the phase change with the sources of the radiation. Combine the conduction heat transfer of the phase change and radiation transfer problem, then create computer program. Calculate the couple radiation and conduction heat transfer of the two-dimension phase change, compared with the finite volume solving of standard to verify the reliability of SPH method. In the last calculate the process of the phase change of the semitransparent particle.
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